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1

Reliability Assessment Incorporating Operational Considerations and Economic  

E-Print Network [OSTI]

PSERC Reliability Assessment Incorporating Operational Considerations and Economic Aspects Engineering Research Center Reliability Assessment Incorporating Operational Considerations and Economic Center (PSERC) research project titled "Reliability Assessment Incorporating Operational Considerations

2

Distributed Generation Operational Reliability and Availability...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Reliability and Availability Database, Final Report, January 2004 Distributed Generation Operational Reliability and Availability Database, Final Report, January 2004 This final...

3

Washington DC Reliability Requirements and the Need to Operate...  

Broader source: Energy.gov (indexed) [DOE]

Washington DC Reliability Requirements and the Need to Operate Mirant's Potomac River Generation Station to Support Local Area Reliability (Oak Ridge National Laboratory 2005)...

4

Sample sizes for confidence limits for reliability.  

SciTech Connect (OSTI)

We recently performed an evaluation of the implications of a reduced stockpile of nuclear weapons for surveillance to support estimates of reliability. We found that one technique developed at Sandia National Laboratories (SNL) under-estimates the required sample size for systems-level testing. For a large population the discrepancy is not important, but for a small population it is important. We found that another technique used by SNL provides the correct required sample size. For systems-level testing of nuclear weapons, samples are selected without replacement, and the hypergeometric probability distribution applies. Both of the SNL techniques focus on samples without defects from sampling without replacement. We generalized the second SNL technique to cases with defects in the sample. We created a computer program in Mathematica to automate the calculation of confidence for reliability. We also evaluated sampling with replacement where the binomial probability distribution applies.

Darby, John L.

2010-02-01T23:59:59.000Z

5

LIMITING ABSORPTION PRINCIPLE FOR SINGULARLY PERTURBED OPERATORS  

E-Print Network [OSTI]

LIMITING ABSORPTION PRINCIPLE FOR SINGULARLY PERTURBED OPERATORS WALTER RENGER Abstract. Given an operator H 1 for which a limiting absorption principle holds, we study operators H 2 which are produced that (except for possibly a discrete set of eigenvalues) a limiting absorption principle holds for H 2 . We

6

DOE limited standard: Operations assessments  

SciTech Connect (OSTI)

Purpose of this standard is to provide DOE Field Element assessors with a guide for conducting operations assessments, and provide DOE Field Element managers with the criteria of the EM Operations Assessment Program. Sections 6.1 to 6.21 provide examples of how to assess specific areas; the general techniques of operations assessments (Section 5) may be applied to other areas of health and safety (e.g. fire protection, criticality safety, quality assurance, occupational safety, etc.).

NONE

1996-05-01T23:59:59.000Z

7

Automated Operating Procedures for Transfer Limits  

E-Print Network [OSTI]

Automated Operating Procedures for Transfer Limits Final Project Report Power Systems Engineering · Illinois · Iowa State · Texas A&M · Washington State · Wisconsin Automated Operating Procedures operating procedures to establish system constraints, particularly in regards to transfer limits across

8

Technical information report: Plasma melter operation, reliability, and maintenance analysis  

SciTech Connect (OSTI)

This document provides a technical report of operability, reliability, and maintenance of a plasma melter for low-level waste vitrification, in support of the Hanford Tank Waste Remediation System (TWRS) Low-Level Waste (LLW) Vitrification Program. A process description is provided that minimizes maintenance and downtime and includes material and energy balances, equipment sizes and arrangement, startup/operation/maintence/shutdown cycle descriptions, and basis for scale-up to a 200 metric ton/day production facility. Operational requirements are provided including utilities, feeds, labor, and maintenance. Equipment reliability estimates and maintenance requirements are provided which includes a list of failure modes, responses, and consequences.

Hendrickson, D.W. [ed.

1995-03-14T23:59:59.000Z

9

Perspectives on Real-Time Grid Operating Technologies to Manage Reliability in the Western Interconnection  

E-Print Network [OSTI]

Real-Time Grid Operating Technologies to Manage ReliabilityEto Environmental Energy Technologies Division October 2013Real-Time Grid Operating Technologies to Manage Reliability

Whitley, Eric

2014-01-01T23:59:59.000Z

10

Achieving High Reliability Operations Through Multi-Program Integration  

SciTech Connect (OSTI)

Over the last 20 years the Idaho National Laboratory (INL) has adopted a number of operations and safety-related programs which has each periodically taken its turn in the limelight. As new programs have come along there has been natural competition for resources, focus and commitment. In the last few years, the INL has made real progress in integrating all these programs and are starting to realize important synergies. Contributing to this integration are both collaborative individuals and an emerging shared vision and goal of the INL fully maturing in its high reliability operations. This goal is so powerful because the concept of high reliability operations (and the resulting organizations) is a masterful amalgam and orchestrator of the best of all the participating programs (i.e. conduct of operations, behavior based safety, human performance, voluntary protection, quality assurance, and integrated safety management). This paper is a brief recounting of the lessons learned, thus far, at the INL in bringing previously competing programs into harmony under the goal (umbrella) of seeking to perform regularly as a high reliability organization. In addition to a brief diagram-illustrated historical review, the authors will share the INLs primary successes (things already effectively stopped or started) and the gaps yet to be bridged.

Holly M. Ashley; Ronald K. Farris; Robert E. Richards

2009-04-01T23:59:59.000Z

11

ADVANCED COMPRESSOR ENGINE CONTROLS TO ENHANCE OPERATION, RELIABILITY AND INTEGRITY  

SciTech Connect (OSTI)

This document is the final report for the ''Advanced Compressor Engine Controls to Enhance Operation, Reliability, and Integrity'' project. SwRI conducted this project for DOE in conjunction with Cooper Compression, under DOE contract number DE-FC26-03NT41859. This report addresses an investigation of engine controls for integral compressor engines and the development of control strategies that implement closed-loop NOX emissions feedback.

Gary D. Bourn; Jess W. Gingrich; Jack A. Smith

2004-03-01T23:59:59.000Z

12

USING SEQUENCING TO IMPROVE OPERATIONAL EFFICIENCY AND RELIABILITY  

SciTech Connect (OSTI)

Operation of an accelerator requires the efficient and reproducible execution of many different types of procedures. Some procedures, like beam acceleration, magnet quench recovery, and species switching can be quite complex. To improve accelerator reliability and efficiency, automated execution of procedures is required. Creation of a single robust sequencing application permits the streamlining of this process and offers many benefits in sequence creation, editing, and control. In this paper, we present key features of a sequencer application commissioned at the Collider-Accelerator Department of Brookhaven National Laboratory during the 2007 run. Included is a categorization of the different types of sequences in use, a discussion of the features considered desirable in a good sequencer, and a description of the tools created to aid in sequence construction and diagnosis. Finally, highlights from our operational experience are presented, with emphasis on Operations control of the sequencer, and the alignment of sequence construction with existing operational paradigms.

D OTTAVIO,T.; NIEDZIELA, J.

2007-10-15T23:59:59.000Z

13

Modular Operational Test Plans for Inferences on Software Reliability Based on a Markov Model  

E-Print Network [OSTI]

Modular Operational Test Plans for Inferences on Software Reliability Based on a Markov Model reliabilities. An operational test procedure is considered in which only the individual modules are tested and the system is considered acceptable if, and only if, no failures are observed. The minimum number of tests

Mazumdar, Mainak

14

APS Beamline Station Operational Limits Information Page  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations2AP-XPS Measures

15

Using Information from Operating Experience to Inform Human Reliability Analysis  

SciTech Connect (OSTI)

This paper reports on efforts being sponsored by the U.S. NRC and performed by INEEL to develop a technical basis and perform work to extract information from sources for use in HRA. The objectives of this work are to: 1) develop a method for conducting risk-informed event analysis of human performance information that stems from operating experience at nuclear power plants and for compiling and documenting the results in a structured manner; 2) provide information from these analyses for use in risk-informed and performance-based regulatory activities; 3) create methods for information extraction and a repository for this information that, likewise, support HRA methods and their applications.

Bruce P. Hallbert; David I. Gertman; Julie Marble; Erasmia Lois; Nathan Siu

2004-06-01T23:59:59.000Z

16

Operating limit evaluation for disposal of uranium enrichment plant wastes  

SciTech Connect (OSTI)

A proposed solid waste landfill at Paducah Gaseous Diffusion Plant (PGDP) will accept wastes generated during normal plant operations that are considered to be non-radioactive. However, nearly all solid waste from any source or facility contains small amounts of radioactive material, due to the presence in most materials of trace quantities of such naturally occurring radionuclides as uranium and thorium. This paper describes an evaluation of operating limits, which are protective of public health and the environment, that would allow waste materials containing small amounts of radioactive material to be sent to a new solid waste landfill at PGDP. The operating limits are expressed as limits on concentrations of radionuclides in waste materials that could be sent to the landfill based on a site-specific analysis of the performance of the facility. These limits are advantageous to PGDP and DOE for several reasons. Most importantly, substantial cost savings in the management of waste is achieved. In addition, certain liabilities that could result from shipment of wastes to a commercial off-site solid waste landfill are avoided. Finally, assurance that disposal operations at the PGDP landfill are protective of public health and the environment is provided by establishing verifiable operating limits for small amounts of radioactive material; rather than relying solely on administrative controls. The operating limit determined in this study has been presented to the Commonwealth of Kentucky and accepted as a condition to be attached to the operating permit for the solid waste landfill.

Lee, D.W.; Kocher, D.C.; Wang, J.C.

1996-02-01T23:59:59.000Z

17

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

SciTech Connect (OSTI)

California is on a path to increase utilization of renewable resources. California will need to integrate approximately 30,000 megawatts (MW) of new renewable generation in the next 20 years. Renewable resources are typically located in remote locations, not near the load centers. Nearly two/thirds or 20,000 MW of new renewable resources needed are likely to be delivered to Los Angeles Basin transmission gateways. Integration of renewable resources requires interconnection to the power grid, expansion of the transmission system capability between the backbone power grid and transmission gateways, and increase in delivery capacity from transmission gateways to the local load centers. To scope the transmission, operations, and reliability issues for renewables integration, this research focused on the Los Angeles Basin Area transmission gateways where most of new renewables are likely. Necessary actions for successful renewables integration include: (1) Expand Los Angeles Basin Area transmission gateway and nomogram limits by 10,000 to 20,000 MW; (2) Upgrade local transmission network for deliverability to load centers; (3) Secure additional storage, demand management, automatic load control, dynamic pricing, and other resources that meet regulation and ramping needed in real time operations; (4) Enhance local voltage support; and (5) Expand deliverability from Los Angeles to San Diego and Northern California.

Eto, Joseph; Budhraja, Vikram; Ballance, John; Dyer, Jim; Mobasheri, Fred; Eto, Joseph

2008-07-01T23:59:59.000Z

18

Quantifying the Operational Benefits of Conventional and Advanced Pumped Storage Hydro on Reliability and Efficiency: Preprint  

SciTech Connect (OSTI)

Pumped storage hydro (PSH) plants have significant potential to provide reliability and efficiency benefits in future electric power systems with high penetrations of variable generation. New PSH technologies, such as adjustable-speed PSH, have been introduced that can also present further benefits. This paper demonstrates and quantifies some of the reliability and efficiency benefits afforded by PSH plants by utilizing the Flexible Energy Scheduling Tool for the Integration of Variable generation (FESTIV), an integrated power system operations tool that evaluates both reliability and production costs.

Krad, I.; Ela, E.; Koritarov, V.

2014-07-01T23:59:59.000Z

19

Wind turbine reliability : understanding and minimizing wind turbine operation and maintenance costs.  

SciTech Connect (OSTI)

Wind turbine system reliability is a critical factor in the success of a wind energy project. Poor reliability directly affects both the project's revenue stream through increased operation and maintenance (O&M) costs and reduced availability to generate power due to turbine downtime. Indirectly, the acceptance of wind-generated power by the financial and developer communities as a viable enterprise is influenced by the risk associated with the capital equipment reliability; increased risk, or at least the perception of increased risk, is generally accompanied by increased financing fees or interest rates. Cost of energy (COE) is a key project evaluation metric, both in commercial applications and in the U.S. federal wind energy program. To reflect this commercial reality, the wind energy research community has adopted COE as a decision-making and technology evaluation metric. The COE metric accounts for the effects of reliability through levelized replacement cost and unscheduled maintenance cost parameters. However, unlike the other cost contributors, such as initial capital investment and scheduled maintenance and operating expenses, costs associated with component failures are necessarily speculative. They are based on assumptions about the reliability of components that in many cases have not been operated for a complete life cycle. Due to the logistical and practical difficulty of replacing major components in a wind turbine, unanticipated failures (especially serial failures) can have a large impact on the economics of a project. The uncertainty associated with long-term component reliability has direct bearing on the confidence level associated with COE projections. In addition, wind turbine technology is evolving. New materials and designs are being incorporated in contemporary wind turbines with the ultimate goal of reducing weight, controlling loads, and improving energy capture. While the goal of these innovations is reduction in the COE, there is a potential impact on reliability whenever new technologies are introduced. While some of these innovations may ultimately improve reliability, in the short term, the technology risks and the perception of risk will increase. The COE metric used by researchers to evaluate technologies does not address this issue. This paper outlines the issues relevant to wind turbine reliability for wind turbine power generation projects. The first sections describe the current state of the industry, identify the cost elements associated with wind farm O&M and availability and discuss the causes of uncertainty in estimating wind turbine component reliability. The latter sections discuss the means for reducing O&M costs and propose O&M related research and development efforts that could be pursued by the wind energy research community to reduce COE.

Not Available

2004-11-01T23:59:59.000Z

20

Operational benefits of relaxed axial power distribution control limits  

SciTech Connect (OSTI)

Constant axial offset control (CAOC) was developed in the early 1970s in response to lower loss-of-coolant accident-based peaking factor limits. Th CAOC requires control of the axial power distribution within a specified band, typically +/- 5% or +3, -12% axial flux difference (AFD), about a measured target value of AFD. Operational outside of the CAOC limits results in the accumulation of penalty time. One hour of penalty time in any 24-h period is permitted. Although CAOC is sufficient to ensure peaking factor limits are satisfied, operation outside of CAOC limits is beneficial under certain conditions. Allowing a relaxation in CAOC restrictions can be used both to enhance the load follow capability of the plant by allowing control strategies that minimize the boron system duty or increase the return to power capability and to greatly increase the ability to return to power after a plant trip or shutdown. To achieve these benefits, relaxed axial offset control (RAOC) was developed. Other benefits of RAOC include a simplified technical specification and the ability to perform in-core/ex-core calibrations at higher powers. Duke Power Company has benefited in many of these ways by changing from CAOC power distribution limits to RAOC power distribution limits at the McGuire Nuclear Station. One of the chief benefits has been the ability to achieve full power much more quickly following shutdowns of short duration and reactor trips during the last half of the cycle lifetime.

Kitlan, M.S. Jr.; Miller, R.W.

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Wind turbine reliability :understanding and minimizing wind turbine operation and maintenance costs.  

SciTech Connect (OSTI)

Wind turbine system reliability is a critical factor in the success of a wind energy project. Poor reliability directly affects both the project's revenue stream through increased operation and maintenance (O&M) costs and reduced availability to generate power due to turbine downtime. Indirectly, the acceptance of wind-generated power by the financial and developer communities as a viable enterprise is influenced by the risk associated with the capital equipment reliability; increased risk, or at least the perception of increased risk, is generally accompanied by increased financing fees or interest rates. This paper outlines the issues relevant to wind turbine reliability for wind turbine power generation projects. The first sections describe the current state of the industry, identify the cost elements associated with wind farm O&M and availability and discuss the causes of uncertainty in estimating wind turbine component reliability. The latter sections discuss the means for reducing O&M costs and propose O&M related research and development efforts that could be pursued by the wind energy research community to reduce cost of energy.

Walford, Christopher A. (Global Energy Concepts. Kirkland, WA)

2006-03-01T23:59:59.000Z

22

A survey of HVDC operating and maintenance practices and their impact on reliability and performance  

SciTech Connect (OSTI)

A questionnaire about operating, maintenance, and spare parts practices and station performance was sent to all HVDC converter stations worldwide. This survey is sponsored by IEEE Working Groups 15.05.08, Economics and Operating Strategies, and I7, Reliability of HVDC Converter Stations. Responses from 38 stations are analyzed, and information bout the most popular practices is reported. One important conclusion is that energy contracts, ac system constraints, and dedicated generation frequency have strong influences on the operation and maintenance practices of HVDC stations. A search is made for correlations between the operating, maintenance, and spare parts practices, including spending, and the stations` performance and availability. No conclusions about the most cost-effective practices can be made. The results are compared with those of a study published in 1992 which covered a few of the same topics.

Cochrane, J.J.; Emerson, M.P. [New England Power Co., Ayer, MA (United States)] [New England Power Co., Ayer, MA (United States); Donahue, J.A. [New England Power Service Co., Westborough, MA (United States)] [New England Power Service Co., Westborough, MA (United States); Wolf, G. [Public Service of New Mexico, Albuquerque, NM (United States)] [Public Service of New Mexico, Albuquerque, NM (United States)

1996-01-01T23:59:59.000Z

23

Renovation and remaining life management techniques for the reliable operation of steam turbine valve casings  

SciTech Connect (OSTI)

Much attention has been focused on the renovation and remaining life management of steam turbine casings. Properly engineered casing repairs, design upgrades, and strategies such as thermal stress monitoring/control, have been successfully employed to keep older steam turbine casings operating reliably until projected plant decommissioning dates. These proven solutions have resulted in a much lower cost alternative to turbine casing replacement. Valve casings are also subject to the rigors of high pressure/temperature operating environments and have a significant replacement cost as well. The same techniques employed to renovate turbine casings can also be successfully applied to valve casings to ensure their reliable operation for the projected plant life. Of particular interest are design upgrades which can be introduced during the renovation. Advances in computer modeling and techniques such as Finite Element analysis have provided engineers with tools not available during the original casing design. This provides an opportunity to not only restore the casings to their original design, but to re-engineer the casings to exceed original design parameters. This paper will cover the engineering analysis of valve casing defects, restoration techniques, and design upgrades. Thermal stress monitoring will be introduced as a technique to manage remaining life. Typical failure modes in various valve casing designs as well as design improvements will be stressed. It will also use case studies to demonstrate the economic and technical advantages of valve and turbine casing renovation.

Rasmussen, D.M.; Otterlee, T.J. [Turbine Consultants, Inc., Milwaukee, WI (United States)

1994-12-31T23:59:59.000Z

24

The Role of Demand Resources In Regional Transmission Expansion Planning and Reliable Operations  

SciTech Connect (OSTI)

Investigating the role of demand resources in regional transmission planning has provided mixed results. On one hand there are only a few projects where demand response has been used as an explicit alternative to transmission enhancement. On the other hand there is a fair amount of demand response in the form of energy efficiency, peak reduction, emergency load shedding, and (recently) demand providing ancillary services. All of this demand response reduces the need for transmission enhancements. Demand response capability is typically (but not always) factored into transmission planning as a reduction in the load which must be served. In that sense demand response is utilized as an alternative to transmission expansion. Much more demand response is used (involuntarily) as load shedding under extreme conditions to prevent cascading blackouts. The amount of additional transmission and generation that would be required to provide the current level of reliability if load shedding were not available is difficult to imagine and would be impractical to build. In a very real sense demand response solutions are equitably treated in every region - when proposed, demand response projects are evaluated against existing reliability and economic criteria. The regional councils, RTOs, and ISOs identify needs. Others propose transmission, generation, or responsive load based solutions. Few demand response projects get included in transmission enhancement plans because few are proposed. But this is only part of the story. Several factors are responsible for the current very low use of demand response as a transmission enhancement alternative. First, while the generation, transmission, and load business sectors each deal with essentially the same amount of electric power, generation and transmission companies are explicitly in the electric power business but electricity is not the primary business focus of most loads. This changes the institutional focus of each sector. Second, market and reliability rules have, understandably, been written around the capabilities and limitations of generators, the historic reliability resources. Responsive load limitations and capabilities are often not accommodated in markets or reliability criteria. Third, because of the institutional structure, demand response alternatives are treated as temporary solutions that can delay but not replace transmission enhancement. Financing has to be based on a three to five year project life as opposed to the twenty to fifty year life of transmission facilities. More can be done to integrate demand response options into transmission expansion planning. Given the societal benefits it may be appropriate for independent transmission planning organizations to take a more proactive role in drawing demand response alternatives into the resource mix. Existing demand response programs provide a technical basis to build from. Regulatory and market obstacles will have to be overcome if demand response alternatives are to be routinely considered in transmission expansion planning.

Kirby, Brendan J [ORNL

2006-07-01T23:59:59.000Z

25

Turbine Reliability and Operability Optimization through the use of Direct Detection Lidar Final Technical Report  

SciTech Connect (OSTI)

The goal of this Department of Energy (DOE) project is to increase wind turbine efficiency and reliability with the use of a Light Detection and Ranging (LIDAR) system. The LIDAR provides wind speed and direction data that can be used to help mitigate the fatigue stress on the turbine blades and internal components caused by wind gusts, sub-optimal pointing and reactionary speed or RPM changes. This effort will have a significant impact on the operation and maintenance costs of turbines across the industry. During the course of the project, Michigan Aerospace Corporation (MAC) modified and tested a prototype direct detection wind LIDAR instrument; the resulting LIDAR design considered all aspects of wind turbine LIDAR operation from mounting, assembly, and environmental operating conditions to laser safety. Additionally, in co-operation with our partners, the National Renewable Energy Lab and the Colorado School of Mines, progress was made in LIDAR performance modeling as well as LIDAR feed forward control system modeling and simulation. The results of this investigation showed that using LIDAR measurements to change between baseline and extreme event controllers in a switching architecture can reduce damage equivalent loads on blades and tower, and produce higher mean power output due to fewer overspeed events. This DOE project has led to continued venture capital investment and engagement with leading turbine OEMs, wind farm developers, and wind farm owner/operators.

Johnson, David K; Lewis, Matthew J; Pavlich, Jane C; Wright, Alan D; Johnson, Kathryn E; Pace, Andrew M

2013-02-01T23:59:59.000Z

26

A chronological probabilistic production cost model to evaluate the reliability contribution of limited energy plants  

E-Print Network [OSTI]

The growth of renewables in power systems has reinvigorated research and regulatory interest in reliability analysis algorithms such as the Baleriaux/Booth convolution-based probabilistic production cost (PPC) model. ...

Leung, Tommy (Tommy Chun Ting)

2012-01-01T23:59:59.000Z

27

Hanford high level waste (HLW) tank mixer pump safe operating envelope reliability assessment  

SciTech Connect (OSTI)

The US Department of Energy and its contractor, Westinghouse Corp., are responsible for the management and safe storage of waste accumulated from processing defense reactor irradiated fuels for plutonium recovery at the Hanford Site. These wastes, which consist of liquids and precipitated solids, are stored in underground storage tanks pending final disposition. Currently, 23 waste tanks have been placed on a safety watch list because of their potential for generating, storing, and periodically releasing various quantities of hydrogen and other gases. Tank 101-SY in the Hanford SY Tank Farm has been found to release hydrogen concentrations greater than the lower flammable limit (LFL) during periodic gas release events. In the unlikely event that an ignition source is present during a hydrogen release, a hydrogen burn could occur with a potential to release nuclear waste materials. To mitigate the periodic gas releases occurring from Tank 101-SY, a large mixer pump currently is being installed in the tank to promote a sustained release of hydrogen gas to the tank dome space. An extensive safety analysis (SA) effort was undertaken and documented to ensure the safe operation of the mixer pump after it is installed in Tank 101-SY.1 The SA identified a need for detailed operating, alarm, and abort limits to ensure that analyzed safety limits were not exceeded during pump operations.

Fischer, S.R. [Los Alamos National Lab., NM (United States); Clark, J. [Science and Engineering Associates, Inc., Albuquerque, NM (United States)

1993-10-01T23:59:59.000Z

28

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

SciTech Connect (OSTI)

An interconnected electric power system is a complex system that must be operated within a safe frequency range in order to reliably maintain the instantaneous balance between generation and load. This is accomplished by ensuring that adequate resources are available to respond to expected and unexpected imbalances and restoring frequency to its scheduled value in order to ensure uninterrupted electric service to customers. Electrical systems must be flexible enough to reliably operate under a variety of"change" scenarios. System planners and operators must understand how other parts of the system change in response to the initial change, and need tools to manage such changes to ensure reliable operation within the scheduled frequency range. This report presents a systematic approach to identifying metrics that are useful for operating and planning a reliable system with increased amounts of variable renewable generation which builds on existing industry practices for frequency control after unexpected loss of a large amount of generation. The report introduces a set of metrics or tools for measuring the adequacy of frequency response within an interconnection. Based on the concept of the frequency nadir, these metrics take advantage of new information gathering and processing capabilities that system operators are developing for wide-area situational awareness. Primary frequency response is the leading metric that will be used by this report to assess the adequacy of primary frequency control reserves necessary to ensure reliable operation. It measures what is needed to arrest frequency decline (i.e., to establish frequency nadir) at a frequency higher than the highest set point for under-frequency load shedding within an interconnection. These metrics can be used to guide the reliable operation of an interconnection under changing circumstances.

Eto, Joseph H.; Undrill, John; Mackin, Peter; Daschmans, Ron; Williams, Ben; Haney, Brian; Hunt, Randall; Ellis, Jeff; Illian, Howard; Martinez, Carlos; O'Malley, Mark; Coughlin, Katie; LaCommare, Kristina Hamachi

2010-12-20T23:59:59.000Z

29

Field Operations Program Chevrolet S-10 (Lead-Acid) Accelerated Reliability Testing - Final Report  

SciTech Connect (OSTI)

This report summarizes the Accelerated Reliability testing of five lead-acid battery-equipped Chevrolet S-10 electric vehicles by the US Department of Energy's Field Operations Program and the Program's testing partners, Electric Transportation Applications (ETA) and Southern California Edison (SCE). ETA and SCE operated the S-10s with the goal of placing 25,000 miles on each vehicle within 1 year, providing an accelerated life-cycle analysis. The testing was performed according to established and published test procedures. The S-10s' average ranges were highest during summer months; changes in ambient temperature from night to day and from season-to-season impacted range by as much as 10 miles. Drivers also noted that excessive use of power during acceleration also had a dramatic effect on vehicle range. The spirited performance of the S-10s created a great temptation to inexperienced electric vehicle drivers to ''have a good time'' and to fully utilize the S-10's acceleration capability. The price of injudicious use of power is greatly reduced range and a long-term reduction in battery life. The range using full-power accelerations followed by rapid deceleration in city driving has been 20 miles or less.

J. Francfort (INEEL); J. Argueta; M. Wehrey (Southern California Edison); D. Karner; L. Tyree (Electric Transportation Applications)

1999-07-01T23:59:59.000Z

30

Implementation of multipartite unitary operations with limited resources  

E-Print Network [OSTI]

A general method for implementing weakly entangling multipartite unitary operations using a small amount of entanglement and classical communication is presented. For the simple Hamiltonian \\sigma_z\\otimes\\sigma_z this method requires less entanglement than previously known methods. In addition, compression of multiple operations is applied to reduce the average communication required.

Dominic W. Berry

2006-08-20T23:59:59.000Z

31

Summary of the Optics, IR, Injection, Operations, Reliability and Instrumentation Working Group  

SciTech Connect (OSTI)

The facilities reported on are all in a fairly mature state of operation, as evidenced by the very detailed studies and correction schemes that all groups are working on. First- and higher-order aberrations are diagnosed and planned to be corrected. Very detailed beam measurements are done to get a global picture of the beam dynamics. More than other facilities the high-luminosity colliders are struggling with experimental background issues, mitigation of which is a permanent challenge. The working group dealt with a very wide rage of practical issues which limit performance of the machines and compared their techniques of operations and their performance. We anticipate this to be a first attempt. In a future workshop in this series, we propose to attempt more fundamental comparisons of each machine, including design parameters. For example, DAPHNE and KEKB employ a finite crossing angle. The minimum value of {beta}*{sub y} attainable at KEKB seems to relate to this scheme. Effectiveness of compensation solenoids and turn-by-turn BPMs etc. should be examined in more detail. In the near future, CESR-C and VEPP-2000 will start their operation. We expect to hear important new experiences from these machines; in particular VEPP-2000 will be the first machine to have adopted round beams. At SLAC and KEK, next generation B Factories are being considered. It will be worthwhile to discuss the design issues of these machines based on the experiences of the existing factory machines.

Wienands, U.; /SLAC; Funakoshi, Y.; /KEK, Tsukuba

2012-04-20T23:59:59.000Z

32

About the Limiting Behaviour of Iterated Robust Morphological Operators  

E-Print Network [OSTI]

Guanajuato, Gto., Mexico horebeek@cimat.mx 2 Freie Universitat Berlin, Institut fur Informatik Tacostr. 9 of morphological operators. To this purpose, we describe the implied iterative process by a discrete dynamical morphology is an important branch of non-linear signal process- ing. It has its roots in discrete geometry

Van Horebeek, Johan

33

On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode  

E-Print Network [OSTI]

The high load limit of a boosted homogeneous-charge-compression-ignition (HCCI) engine operating on negative-valve-overlap (NVO) was assessed. When operating under stoichiometric condition with no external dilution, the ...

Scaringe, Robert J.

34

Integration of renewable energy sources: reliability-constrained power system planning and operations using computational intelligence  

E-Print Network [OSTI]

of cost, power dispatchability, and environmental impact. For instance, the intermittency of some renewable energy sources may compromise the system reliability when they are integrated into the traditional power grids. Thus, multiple issues should...

Wang, Lingfeng

2009-05-15T23:59:59.000Z

35

Flood control reservoir operations for conditions of limited storage capacity  

E-Print Network [OSTI]

). Therefore, if the entire flood control capacity of a reservoir is available, only an extremely severe flood event would require the implementation of the EOS for most reservoir projects, and thus the bulk of the research has been focused on how to manage... operations objectives. In other words, the REOS provide a set of rules that reflect the risk of flooding upstream as well as downstream of the dams. The USACE and other reservoir management agencies may use the methodology proposed in this study...

Rivera Ramirez, Hector David

2005-02-17T23:59:59.000Z

36

Limit Operators, Collective Compactness, and the Spectral Theory of Infinite Matrices  

E-Print Network [OSTI]

In the first half of this text we explore the interrelationships between the abstract theory of limit operators (see e.g. the recent monographs of Rabinovich, Roch & Silbermann and Lindner) and the concepts and results of the generalised collectively compact operator theory introduced by Chandler-Wilde and Zhang. We build up to results obtained by applying this generalised collectively compact operator theory to the set of limit operators of an operator $A$. In the second half of this text we study bounded linear operators on the generalised sequence space $\\ell^p(\\Z^N,U)$, where $p\\in [1,\\infty]$ and $U$ is some complex Banach space. We make what seems to be a more complete study than hitherto of the connections between Fredholmness, invertibility, invertibility at infinity, and invertibility or injectivity of the set of limit operators, with some emphasis on the case when the operator $A$ is a locally compact perturbation of the identity. Especially, we obtain stronger results than previously known for the subtle limiting cases of $p=1$ and $\\infty$. Our tools in this study are the results from the first half of the text and an exploitation of the partial duality between $\\ell^1$ and $\\ell^\\infty$. Results in this second half of the text include a new proof that injectivity of all limit operators (the classic Favard condition) implies invertibility for a general class of almost periodic operators, and characterisations of invertibility at infinity and Fredholmness for operators in the so-called Wiener algebra. In two final chapters our results are illustrated by and applied to concrete examples. Firstly, we study the spectra and essential spectra of discrete Schr\\"odinger operators (both self-adjoint and non-self-adjoint), including operators with almost periodic and random potentials. In the final chapter we apply our results to integral operators on $\\R^N$.

Simon N. Chandler-Wilde; Marko Lindner

2010-05-05T23:59:59.000Z

37

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

operatingattributes: Loadfollowing. Spinningandnon?dispatchable,thenloadfollowing,regulation,rampingregulation,ramping,loadfollowing,voltagesupportand

Budhraja, Vikram

2008-01-01T23:59:59.000Z

38

Recirculation on a single stage of vertical flow constructed wetland: treatment limits and operation modes  

E-Print Network [OSTI]

1 Recirculation on a single stage of vertical flow constructed wetland: treatment limits French vertical flow constructed wetlands (VFCWs) plant comprises two stages of treatment which the first and treatment performances in different operating conditions. Results showed good performances

Paris-Sud XI, Université de

39

New strategies for avoiding robot joint limits: Application to visual servoing using a large projection operator  

E-Print Network [OSTI]

. Using the new projection operator allows a significant improvement of the joint avoidance processNew strategies for avoiding robot joint limits: Application to visual servoing using a large projection operator Mohammed Marey & Franc¸ois Chaumette Abstract-- In this paper, we present a new

Paris-Sud XI, Université de

40

Reliability Results of NERSC Systems  

E-Print Network [OSTI]

Reliability Results of NERSC Systems Akbar Mokhtarani,analysis of systems reliability and component failure rates,reported to operation. Reliability Data HPSS and the IBM SP

Mokhtarani, Akbar; Petascale Data Storage Institute (PDSI)

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Unmanned Aerial Vehicle (UAV) Dynamic-Tracking Directional Wireless Antennas for Low Powered Applications that Require Reliable Extended Range Operations in Time Critical Scenarios  

SciTech Connect (OSTI)

The proven value of DOD Unmanned Aerial Vehicles (UAVs) will ultimately transition to National and Homeland Security missions that require real-time aerial surveillance, situation awareness, force protection, and sensor placement. Public services first responders who routinely risk personal safety to assess and report a situation for emergency actions will likely be the first to benefit from these new unmanned technologies. Packable or Portable small class UAVs will be particularly useful to the first responder. They require the least amount of training, no fixed infrastructure, and are capable of being launched and recovered from the point of emergency. All UAVs require wireless communication technologies for real- time applications. Typically on a small UAV, a low bandwidth telemetry link is required for command and control (C2), and systems health monitoring. If the UAV is equipped with a real-time Electro-Optical or Infrared (EO/Ir) video camera payload, a dedicated high bandwidth analog/digital link is usually required for reliable high-resolution imagery. In most cases, both the wireless telemetry and real-time video links will be integrated into the UAV with unity gain omni-directional antennas. With limited on-board power and payload capacity, a small UAV will be limited with the amount of radio-frequency (RF) energy it transmits to the users. Therefore, packable and portable UAVs will have limited useful operational ranges for first responders. This paper will discuss the limitations of small UAV wireless communications. The discussion will present an approach of utilizing a dynamic ground based real-time tracking high gain directional antenna to provide extend range stand-off operation, potential RF channel reuse, and assured telemetry and data communications from low-powered UAV deployed wireless assets.

Scott G. Bauer; Matthew O. Anderson; James R. Hanneman

2005-10-01T23:59:59.000Z

42

Operating limit study for the proposed solid waste landfill at Paducah Gaseous Diffusion Plant  

SciTech Connect (OSTI)

A proposed solid waste landfill at Paducah Gaseous Diffusion Plant (PGDP) would accept wastes generated during normal operations that are identified as non-radioactive. These wastes may include small amounts of radioactive material from incidental contamination during plant operations. A site-specific analysis of the new solid waste landfill is presented to determine a proposed operating limit that will allow for waste disposal operations to occur such that protection of public health and the environment from the presence of incidentally contaminated waste materials can be assured. Performance objectives for disposal were defined from existing regulatory guidance to establish reasonable dose limits for protection of public health and the environment. Waste concentration limits were determined consistent with these performance objectives for the protection of off-site individuals and inadvertent intruders who might be directly exposed to disposed wastes. Exposures of off-site individuals were estimated using a conservative, site-specific model of the groundwater transport of contamination from the wastes. Direct intrusion was analyzed using an agricultural homesteader scenario. The most limiting concentrations from direct intrusion or groundwater transport were used to establish the concentration limits for radionuclides likely to be present in PGDP wastes.

Lee, D.W.; Wang, J.C.; Kocher, D.C.

1995-06-01T23:59:59.000Z

43

Temperature limits for LMFBR fuel cladding under upset and emergency operating conditions  

SciTech Connect (OSTI)

LMFBR fuel pin cladding tube is subjected to high transient temperatures during incidents such as pump trip, pump to grid plate pipe rupture etc. It is required to know temperature limits under such transient operating conditions for components involved while analyzing such incidents. A methodology for deriving such limits for fuel clad tube is worked out in this paper by making use of the transient damage correlation proposed by W.F. Brizes et. al.

Govindarajan, S.; Chetal, S.C. [Indira Gandhi Centre for Atomic Research, Kalpakkam Tamilnadu (India). Nuclear Systems Division

1996-07-01T23:59:59.000Z

44

High energy bursts from a solid state laser operated in the heat capacity limited regime  

DOE Patents [OSTI]

High energy bursts are produced from a solid state laser operated in a heat capacity limited regime. Instead of cooling the laser, the active medium is thermally well isolated. As a result, the active medium will heat up until it reaches some maximum acceptable temperature. The waste heat is stored in the active medium itself. Therefore, the amount of energy the laser can put out during operation is proportional to its mass, the heat capacity of the active medium, and the temperature difference over which it is being operated. The high energy burst capacity of a heat capacity operated solid state laser, together with the absence of a heavy, power consuming steady state cooling system for the active medium, will make a variety of applications possible. Alternately, cooling takes place during a separate sequence when the laser is not operating. Industrial applications include new material working processes. 5 figs.

Albrecht, G.; George, E.V.; Krupke, W.F.; Sooy, W.; Sutton, S.B.

1996-06-11T23:59:59.000Z

45

High energy bursts from a solid state laser operated in the heat capacity limited regime  

DOE Patents [OSTI]

High energy bursts are produced from a solid state laser operated in a heat capacity limited regime. Instead of cooling the laser, the active medium is thermally well isolated. As a result, the active medium will heat up until it reaches some maximum acceptable temperature. The waste heat is stored in the active medium itself. Therefore, the amount of energy the laser can put out during operation is proportional to its mass, the heat capacity of the active medium, and the temperature difference over which it is being operated. The high energy burst capacity of a heat capacity operated solid state laser, together with the absence of a heavy, power consuming steady state cooling system for the active medium, will make a variety of applications possible. Alternately, cooling takes place during a separate sequence when the laser is not operating. Industrial applications include new material working processes.

Albrecht, Georg (Livermore, CA); George, E. Victor (Livermore, CA); Krupke, William F. (Pleasanton, CA); Sooy, Walter (Pleasanton, CA); Sutton, Steven B. (Manteca, CA)

1996-01-01T23:59:59.000Z

46

Determination of operating limits for radionuclides for a proposed landfill at Paducah Gaseous Diffusion Plant  

SciTech Connect (OSTI)

The operating limits for radionuclides in sanitary and industrial wastes were determined for a proposed landfill at the Paducah Gaseous Diffusion Plant (PGDP), Kentucky. These limits, which may be very small but nonzero, are not mandated by law or regulation but are needed for rational operation. The approach was based on analyses of the potential contamination of groundwater at the plant boundary and the potential exposure to radioactivity of an intruder at the landfill after closure. The groundwater analysis includes (1) a source model describing the disposal of waste and the release of radionuclides from waste to the groundwater, (2) site-specific groundwater flow and contaminant transport calculations, and (3) calculations of operating limits from the dose limit and conversion factors. The intruder analysis includes pathways through ingestion of contaminated vegetables and soil, external exposure to contaminated soil, and inhalation of suspended activity from contaminated soil particles. In both analyses, a limit on annual effective dose equivalent of 4 mrem (0.04 mSv) was adopted. The intended application of the results is to refine the radiological monitoring standards employed by the PGDP Health Physics personnel to determine what constitutes radioactive wastes, with concurrence of the Commonwealth of Kentucky.

Wang, J.C.; Lee, D.W.; Ketelle, R.H.; Lee, R.R.; Kocher, D.C.

1994-05-24T23:59:59.000Z

47

Limiter  

DOE Patents [OSTI]

A limiter with a specially contoured front face is provided. The front face of the limiter (the plasma-side face) is flat with a central indentation. In addition, the limiter shape is cylindrically symmetric so that the limiter can be rotated for greater heat distribution. This limiter shape accommodates the various power scrape-off distances lambda p, which depend on the parallel velocity, V/sub parallel/, of the impacting particles.

Cohen, S.A.; Hosea, J.C.; Timberlake, J.R.

1984-10-19T23:59:59.000Z

48

Notice of Emergency Action - Emergency Order To Resume Limited...  

Broader source: Energy.gov (indexed) [DOE]

Emergency Action - Emergency Order To Resume Limited Operation at the Potomac River Generating Station, Alexandria, VA, in Response to Electricity Reliability Concerns in...

49

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

E-Print Network [OSTI]

2007. Integration of Renewable Resources. Transmissionfor integrating renewable resources on the California ISO-assess the level of renewable resources that can be reliably

Eto, Joseph H.

2011-01-01T23:59:59.000Z

50

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

E-Print Network [OSTI]

Load Following regulation and load following), but only to a limited extentregulation and load following), but only to a limited extent

Eto, Joseph H.

2011-01-01T23:59:59.000Z

51

Torque limit of PM motors for field-weakening region operation  

DOE Patents [OSTI]

The invention includes a motor controller and technique for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by receiving a torque command, determining a physical torque limit based on a stator frequency, determining a theoretical torque limit based on a maximum available voltage and motor inductance ratio, and limiting the torque command to the smaller of the physical torque limit and the theoretical torque limit. Receiving the torque command may include normalizing the torque command to obtain a normalized torque command, determining the physical torque limit may include determining a normalized physical torque limit, determining a theoretical torque limit may include determining a normalized theoretical torque limit, and limiting the torque command may include limiting the normalized torque command to the smaller of the normalized physical torque limit and the normalized theoretical torque limit.

Royak, Semyon (Beachwood, OH); Harbaugh, Mark M. (Richfield, OH)

2012-02-14T23:59:59.000Z

52

Evaluation of exposure limits to toxic gases for nuclear reactor control room operators  

SciTech Connect (OSTI)

We have evaluated ammonia, chlorine, Halon (actually a generic name for several halogenated hydro-carbons), and sulfur dioxide for their possible effects during an acute two-minute exposure in order to derive recommendations for maximum exposure levels. To perform this evaluation, we conducted a search to find the most pertinent literature regarding toxicity in humans and in experimental animals. Much of the literature is at least a decade old, not an unexpected finding since acute exposures are less often performed now than they were a few years ago. In most cases, the studies did not specifically examine the effects of two-minute exposures; thus, extrapolations had to be made from studies of longer-exposure periods. Whenever possible, we gave the greatest weight to human data, with experimental animal data serving to strengthen the conclusion arrived at from consideration of the human data. Although certain individuals show hypersensitivity to materials like sulfur dioxide, we have not attempted to factor this information into the recommendations. After our evaluation of the data in the literature, we held a small workshop. Major participants in this workshop were three consultants, all of whom were Diplomates of the American Board of Toxicology, and staff from the Nuclear Regulatory Commission. Our preliminary recommendations for two-minute exposure limits and the rationale for them were discussed and consensus reached on final recommendations. These recommendations are: (1) ammonia-300 to 400-ppm; (2) chlorine-30 ppm; (3) Halon 1301-5%; Halon 1211-2%; and (4) sulfur dioxide-100 ppm. Control room operators should be able to tolerate two-minute exposures to these levels, don fresh-air masks, and continue to operate the reactor if the toxic material is eliminated, or safely shut down the reactor if the toxic gas remains. 96 refs., 9 tabs.

Mahlum, D.D.; Sasser, L.B. (Pacific Northwest Lab., Richland, WA (United States))

1991-07-01T23:59:59.000Z

53

Theory of factors limiting high gradient operation of warm accelerating structures  

SciTech Connect (OSTI)

This final report summarizes the research performed during the time period from 8/1/2010 to 7/31/2013. It consists of two parts describing our studies in two directions: (a) analysis of factors limiting operation of dielectric-loaded accelerating (DLA) structures where the main problem is the occurrence of multipactor on dielectric surfaces, and (b) studies of effects associated with either RF magnetic or RF electric fields which may cause the RF breakdown in high-gradient metallic accelerating structures. In the studies of DLA structures, at least, two accomplishments should be mentioned: the development of a 3D non-stationary, self-consistent code describing the multipactor phenomena and yielding very good agreement with some experimental data obtained in joint ANL/NRL experiments. In the metallic structures, such phenomena as the heating and melting of micro-particles (metallic dust) by RF electric and magnetic fields in single-shot and rep-rate regimes is analyzed. Also, such processes in micro-protrusions on the structure surfaces as heating and melting due to the field emitted current and the Nottingham effect are thoroughly investigated with the account for space charge of emitted current on the field emission from the tip.

Nusinovich, Gregory S. [University of Maryland; Antonsen, Thomas M. [University of Maryland; Kishek, Rami [University of Maryland

2014-07-25T23:59:59.000Z

54

Design modification for the modular helium reactor for higher temperature operation and reliability studies for nuclear hydrogen production processes  

E-Print Network [OSTI]

of these modifications together, the PVT is reduced to ~350 0C while keeping the outlet temperature at 950 0C and maintaining the PFT within acceptable limits. The vessel and fuel temperatures during low pressure conduction cooldown and high pressure conduction cooldown...

Reza, S.M. Mohsin

2009-05-15T23:59:59.000Z

55

Operating experience feedback report: Reliability of safety-related steam turbine-driven standby pumps. Commercial power reactors, Volume 10  

SciTech Connect (OSTI)

This report documents a detailed analysis of failure initiators, causes and design features for steam turbine assemblies (turbines with their related components, such as governors and valves) which are used as drivers for standby pumps in the auxiliary feedwater systems of US commercial pressurized water reactor plants, and in the high pressure coolant injection and reactor core isolation cooling systems of US commercial boiling water reactor plants. These standby pumps provide a redundant source of water to remove reactor core heat as specified in individual plant safety analysis reports. The period of review for this report was from January 1974 through December 1990 for licensee event reports (LERS) and January 1985 through December 1990 for Nuclear Plant Reliability Data System (NPRDS) failure data. This study confirmed the continuing validity of conclusions of earlier studies by the US Nuclear Regulatory Commission and by the US nuclear industry that the most significant factors in failures of turbine-driven standby pumps have been the failures of the turbine-drivers and their controls. Inadequate maintenance and the use of inappropriate vendor technical information were identified as significant factors which caused recurring failures.

Boardman, J.R.

1994-10-01T23:59:59.000Z

56

NREL's Gearbox Reliability Collaborative leads to wind turbine gearbox reliability, lowering the cost of energy.  

E-Print Network [OSTI]

NREL's Gearbox Reliability Collaborative leads to wind turbine gearbox reliability, lowering operations. In 2007, the National Renewable Energy Laboratory (NREL) initi- ated the Gearbox Reliability that contribute to reduced gearbox reliability. In contrast to private investigations of these problems, GRC

57

Strategies and Decision Support Systems for Integrating Variable Energy Resources in Control Centers for Reliable Grid Operations  

SciTech Connect (OSTI)

A variety of studies have recently evaluated the opportunities for the large-scale integration of wind energy into the US power system. These studies have included, but are not limited to, "20 Percent Wind Energy by 2030: Increasing Wind Energy's Contribution to US Electricity Supply", the "Western Wind and Solar Integration Study", and the "Eastern Wind Integration and Transmission Study." Each of these US based studies have evaluated a variety of activities that can be undertaken by utilities to help integrate wind energy.

Jones, Lawrence E.

2011-12-01T23:59:59.000Z

58

Measurement of limiter heating due to fusion product losses during high fusion power deuterium-tritium operation of TFTR  

SciTech Connect (OSTI)

Preliminary analysis has been completed on measurements of limiter heating during high fusion power deuterium-tritium (D-T) operation of TFTR, in an attempt to identify heating from alpha particle losses. Recent operation of TFTR with a 50-50 mix of D-T has resulted in fusion power output ({approx} 6.2 MW) orders of magnitude above what was previously achieved on TFTR. A significantly larger absolute number of particles and energy from fusion products compared to D-D operation is expected to be lost to the limiters. Measurements were made in the vicinity of the midplane ({plus_minus} 30{degree}) with thermocouples mounted on the tiles of an outboard limiter. Comparisons were made -between discharges which were similar except for the mix of deuterium and tritium beam sources. Power and energy estimates of predicted alpha losses were as high as 0.13 MW and 64 kJ. Depending on what portion of the limiters absorbed this energy, temperature rises of up to 42 {degrees}C could be expected, corresponding to a heat load of 0.69 MJ/m{sup 2} over a 0.5 sec period, or a power load of 1.4 MW/m{sup 2}. There was a measurable increase in the limiter tile temperature as the fusion power yield increased with a more reactive mixture of D and T at constant beam power during high power D-T operation. Analysis of the data is being conducted to see if the alpha heating component can be extracted. Measured temperature increases were no greater than 1 {degree}C, indicating that there was probably neither an unexpectedly large fraction of lost particles nor unexpected localization of the losses. Limits on the stochastic ripple loss contribution from alphas can be deduced.

Janos, A.; Owens, D.K.; Darrow, D.; Redi, M.; Zarnstorff, M.; Zweben, S.

1995-03-01T23:59:59.000Z

59

Evaluation of design and operating speeds for crest vertical curves with limited sight distance  

E-Print Network [OSTI]

The Puerto Colon field is located in the Putumayo basin in southern Colombia, South America, and is operated by Empresa Colombiana de petroleos (ECOPETROL), which is the national oil company. The field produces from the Cretaceous sandstones...

Russell, Charles William

1994-01-01T23:59:59.000Z

60

Reliability Standards Owner  

Broader source: Energy.gov [DOE]

This position is located in the Internal Operations and Asset Management group of Planning and Asset Management (TP). A successful candidate in this position will serve as the Reliability Standards...

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Criticality Safety Evaluations on the Use of 200-gram Pu Mass Limit for RHWM Waste Storage Operations  

SciTech Connect (OSTI)

This work establishes the criticality safety technical basis to increase the fissile mass limit from 120 grams to 200 grams for Type A 55-gallon drums and their equivalents. Current RHWM fissile mass limit is 120 grams Pu for Type A 55-gallon containers and their equivalent. In order to increase the Type A 55-gallon drum limit to 200 grams, a few additional criticality safety control requirements are needed on moderators, reflectors, and array controls to ensure that the 200-gram Pu drums remain criticality safe with inadvertent criticality remains incredible. The purpose of this work is to analyze the use of 200-gram Pu drum mass limit for waste storage operations in Radioactive and Hazardous Waste Management (RHWM) Facilities. In this evaluation, the criticality safety controls associated with the 200-gram Pu drums are established for the RHWM waste storage operations. With the implementation of these criticality safety controls, the 200-gram Pu waste drum storage operations are demonstrated to be criticality safe and meet the double-contingency-principle requirement per DOE O 420.1.

Chou, P

2011-12-14T23:59:59.000Z

62

Operational limit of closed loop pulsating heat pipes Honghai Yang a,*, S. Khandekar b  

E-Print Network [OSTI]

a College of Environmental Science and Engineering, Donghua University, Shanghai 200051, PR China b of a total of 40 copper tubes with 1 mm and 2 mm inner diameter, respectively. R123 was employed important ones. In both cases the limit will manifest itself by an unacceptable over- heating

Khandekar, Sameer

63

Establishing low-power operating limits for liquid metal heat pipes  

SciTech Connect (OSTI)

Liquid metal heat pipes operated at power throughputs well below their design point for long durations may fail as a result of the working fluid migrating to a cold region within the pipe, freezing there, and hot returning to the evaporator section. Eventually sufficient working fluid inventory may be lost to the cold region to cause a local dry-out condition in the evaporator. A joint experimental and analytical effort between the Air Force Phillips Laboratory and Los Alamos National Laboratory is underway to investigate the phenomena. Experiments include both high temperature liquid metal and low temperature organic heat pipes. To date, a low temperature working fluid has been selected and its performance in a heat pipe validated. Additionally, a low-temperature heat pipe has been fabricated and is presently being tested.

Secary, J. (Phillips Lab., Kirtland AFB, NM (United States)); Merrigan, M.A.; Keddy, M.D. (Los Alamos National Lab., NM (United States))

1992-01-01T23:59:59.000Z

64

Establishing low-power operating limits for liquid metal heat pipes  

SciTech Connect (OSTI)

Liquid metal heat pipes operated at power throughputs well below their design point for long durations may fail as a result of the working fluid migrating to a cold region within the pipe, freezing there, and hot returning to the evaporator section. Eventually sufficient working fluid inventory may be lost to the cold region to cause a local dry-out condition in the evaporator. A joint experimental and analytical effort between the Air Force Phillips Laboratory and Los Alamos National Laboratory is underway to investigate the phenomena. Experiments include both high temperature liquid metal and low temperature organic heat pipes. To date, a low temperature working fluid has been selected and its performance in a heat pipe validated. Additionally, a low-temperature heat pipe has been fabricated and is presently being tested.

Secary, J. [Phillips Lab., Kirtland AFB, NM (United States); Merrigan, M.A.; Keddy, M.D. [Los Alamos National Lab., NM (United States)

1992-05-01T23:59:59.000Z

65

Data Center Efficiency and IT Equipment Reliability at Wider...  

Broader source: Energy.gov (indexed) [DOE]

Center Efficiency and IT Equipment Reliability at Wider Operating Temperature and Humidity Ranges Data Center Efficiency and IT Equipment Reliability at Wider Operating Temperature...

66

Electricity Reliability  

E-Print Network [OSTI]

Electricity Delivery and Energy Reliability High Temperature Superconductivity (HTS) Visualization in the future because they have virtually no resistance to electric current, offering the possibility of new electric power equipment with more energy efficiency and higher capacity than today's systems

67

Operating experience feedback report-reliability of safety-related steam turbine-driven standby pumps used in US commerical nuclear power plants  

SciTech Connect (OSTI)

Pump failure experience is collected by two primary means: (1) Licensee Event Reports, and (2) Nuclear Plant Reliability Data System failure reports. Certain safety-related turbine-driven standby pumps were identified by these data systems as experiencing significant ongoing repetitive failures of their turbine drivers, resulting in low reliability of the pump units. The root causes of identified failures were determined, and actions to preclude these repetitive failures were identified. 5 refs., 1 tab.

Boardman, J.R. [Nuclear Regulatory Commission, Washington, DC (United States)

1995-01-01T23:59:59.000Z

68

Reliability Assessment The Reliability of the  

E-Print Network [OSTI]

2006 Long-Term Reliability Assessment The Reliability of the Bulk Power Systems In North America North American Electric Reliability Council October 2006 #12;TABLE OF CONTENTS Page 2 NERC 2006 Long-Term Reliability Assessment TABLE OF CONTENTS INTRODUCTION

70

Human-reliability data bank for nuclear-power-plant operations. Volume 2. A data-bank concept and system description  

SciTech Connect (OSTI)

The US Nuclear Regulatory Commission (NRC) is conducting a research program to determine the need for a human-reliability data bank unique to the nuclear industry. This report, in describing a proposed data bank, focuses primarily on four requirements: human-performance data collection, treatment, structuring (storage), and retrieval. Four data-collection methods are proposed: three are extensions to existing systems (i.e., Licensee Event Reports (LER), Nuclear Plant Reliability Data System (NPRDS), and Plant Incident Reports (PIR)); the fourth is a new system called the Nuclear Safety Reporting System (NSRS). Data treatment involves evaluating raw field data and data from other sources (e.g., training simulator, expert judgment, and performance modeling), and preparing them for entry into the data bank. Data structuring involves storage of data by equipment characteristics and human actions at the system, component, and individual control/display levels. Data retrieval uses a set of matrices based on the data-structuring taxonomy.

Comer, M.K.; Kozinsky, E.J.; Eckel, J.S.; Miller, D.P.

1983-02-01T23:59:59.000Z

71

Reliability Optimization of Redundant Software with Correlated Failures  

E-Print Network [OSTI]

Reliability Optimization of Redundant Software with Correlated Failures Walter J. Gutjahr \\Lambda of reliability optimization of modular software with redundancy. At present, these approaches seem to be limited to generalize these reliability optimization techniques by taking such correlations explicitly

Gutjahr, Walter

72

Dispatcher Reliability Analysis : SPICA-RAIL Experiments  

E-Print Network [OSTI]

Dispatcher Reliability Analysis : SPICA-RAIL Experiments Fabien Belmonte, Jean-Louis Boulanger of scenarios and evaluate the behaviour of human operators. A state of the art in human reliability is pre coupled to a traffic simulator. It allows to gather data for human reliability evaluation and man

Paris-Sud XI, Université de

73

The Whereabouts of Reliability Education: Challenges & Opportunities  

E-Print Network [OSTI]

. There is a gap between reliability theory and practice, between school and industry, book knowledge and real The probability that the system is still operating at time t. where f(t) probability density function h(t) failure changing and getting higher. #12;Some Reliability books in ... 1960s Igor Bazovsky (1961), Reliability

Bernstein, Joseph B.

74

Virtually simulating the next generation of clean energy technologies: NETL's AVESTAR Center is dedicated to the safe, reliable and efficient operation of advanced energy plants with carbon capture  

SciTech Connect (OSTI)

Imagine using a real-time virtual simulator to learn to fly a space shuttle or rebuild your car's transmission without touching a piece of equipment or getting your hands dirty. Now, apply this concept to learning how to operate and control a state-of-the-art, electricity-producing power plant capable of carbon dioxide (CO{sub 2}) capture. That's what the National Energy Technology Laboratory's (NETL) Advanced Virtual Energy Simulation Training and Research (AVESTAR) Center (www.netl.doe.gov/avestar) is designed to do. Established as part of the Department of Energy's (DOE) initiative to advance new clean energy technology for power generation, the AVESTAR Center focuses primarily on providing simulation-based training for process engineers and energy plant operators, starting with the deployment of a first-of-a-kind operator training simulator for an integrated gasification combined cycle (IGCC) power plant with CO{sub 2} capture. The IGCC dynamic simulator builds on, and reaches beyond, conventional power plant simulators to merge, for the first time, a 'gasification with CO{sub 2} capture' process simulator with a 'combined-cycle' power simulator. Based on Invensys Operations Management's SimSci-Esscor DYNSIM software, the high-fidelity dynamic simulator provides realistic training on IGCC plant operations, including normal and faulted operations, as well as plant start-up, shutdown and power demand load changes. The highly flexible simulator also allows for testing of different types of fuel sources, such as petcoke and biomass, as well as co-firing fuel mixtures. The IGCC dynamic simulator is available at AVESTAR's two locations, NETL (Figure 1) and West Virginia University's National Research Center for Coal and Energy (www.nrcce.wvu.edu), both in Morgantown, W.Va. By offering a comprehensive IGCC training program, AVESTAR aims to develop a workforce well prepared to operate, control and manage commercial-scale gasification-based power plants with CO{sub 2} capture. The facility and simulator at West Virginia University promotes NETL's outreach mission by offering hands-on simulator training and education to researchers and university students.

Zitney, S.

2012-01-01T23:59:59.000Z

75

A Novel Virtual Age Reliability Model for Time-to-Failure Prediction  

E-Print Network [OSTI]

counts, devices approaching physical feature size limits and nuclear plant comparable power densityA Novel Virtual Age Reliability Model for Time-to-Failure Prediction Yao Wang, Sorin Cotofana their relatively short operating lifetime. To overcome the MTTF weakness, this paper proposes a novel virtual age

Kuzmanov, Georgi

76

Software Reliability Xiangyu Zhang  

E-Print Network [OSTI]

1 Software Reliability Xiangyu Zhang Pronounced as Shang You Zang CS590F Software Reliability Software Reliability Why Reliable Software is Important? Software bugs cost the U.S. economy about $59 in Spacecraft Accidents (http://sunnyday.mit.edu/papers/jsr.pdf) CS590F Software Reliability Why ? ­ FSE'06

Zhang, Xiangyu

77

Power as a function of reliability  

SciTech Connect (OSTI)

Many studies employ multiple measurement instruments such as human raters, observers, judges, or mechanical gauges to record subject data. It is well known that the consistency of these instruments, commonly called rater reliability, limits the extent to which conclusions should be drawn from the observed data. However, the degree to which rater reliability limits conclusions has traditionally been assessed in only subjective manners. In this paper, a method is developed for objectively quantifying the impact of rate reliability on the statistical analysis of data from a commonly used collection scheme. This method allows the inclusion of a reliability index in statistical power calculations and is an invaluable tool in the planning of experiments.

Abate, M.L. [Sandia National Labs., Albuquerque, NM (United States); McCabe, G.P.; Lynch, M.P. [Purdue Univ., Lafayette, IN (United States)

1995-10-01T23:59:59.000Z

78

Analysis of operational, institutional and international limitations for alternative fuel vehicles and technologies: Means/methods for implementing changes  

SciTech Connect (OSTI)

This project focused upon the development of an approach to assist public fleet managers in evaluating the characteristics and availability of alternative fuels (AF`s) and alternative fuel vehicles (AFV`s) that will serve as possible replacements for vehicles currently serving the needs of various public entities. Also of concern were the institutional/international limitations for alternative fuels and alternative fuel vehicles. The City of Detroit and other public agencies in the Detroit area were the particular focus for the activities. As the development and initial stages of use of alternative fuels and alternative fuel vehicles proceeds, there will be an increasing need to provide information and guidance to decision-makers regarding differences in requirements and features of these fuels and vehicles. There wig be true differences in requirements for servicing, managing, and regulating. There will also be misunderstanding and misperception. There have been volumes of data collected on AFV`S, and as technology is improved, new data is constantly added. There are not, however, condensed and effective sources of information for public vehicle fleet managers on vehicle and equipment sources, characteristics, performance, costs, and environmental benefits. While theoretical modeling of public fleet requirements has been done, there do not seem to be readily available ``practical``. There is a need to provide the best possible information and means to minimize the problems for introducing the effective use of alternative fuels and alternative fuel vehicles.

Not Available

1992-07-01T23:59:59.000Z

79

Logic Synthesis for FPGA Reliability  

E-Print Network [OSTI]

for FPGA Reliability . . . . . . . . . . . . . Hard ErrorsStochastic Resynthesis for FPGA Reliability . . . . . .In-Place Reconfiguration for FPGA Reliability . . . . . .

Feng, Zhe

2013-01-01T23:59:59.000Z

80

Thin Film Reliability SEMICONDUCTORS  

E-Print Network [OSTI]

Thin Film Reliability SEMICONDUCTORS Our goal is to develop new ways to evaluate the reliability $250 billion per year. As semiconductor devices become ultra miniaturized, reliability testing becomes-world conditions as possible will enable product designers to better balance performance and reliability

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Reliability-Centered Maintenance  

Broader source: Energy.gov [DOE]

Reliability-centered maintenance leverages the same practices and technologies of predictive maintenance.

82

North American Electric Reliability Corporation (NERC): Reliability...  

Broader source: Energy.gov (indexed) [DOE]

and winter and summer forecasts; monitors the bulk power systems; and educates, trains, and certifies industry personnel. North American Electric Reliability Corporation...

83

Operations & Maintenance Best Practices Guide: Release 3.0  

Broader source: Energy.gov (indexed) [DOE]

- To ensure effective implementation and control of operation activities. * Conduct of Operations - To ensure efficient, safe, and reliable process operations. *...

84

Cloud Operations Excellence & Reliability Page 1 Excellence &  

E-Print Network [OSTI]

and our sites secure from attack, while protecting the privacy of personally identifiable information

Chaudhuri, Surajit

85

Secure and reliable operation of our  

E-Print Network [OSTI]

of threats: Attacks upon the power system. In this case, the electricity infrastructure itself could use power plant cooling towers, for example, to disperse chem- ical or biological agents to national and international economy, security, and quality of life. Massoud Amin, Electric Power Research

Amin, S. Massoud

86

Distributed Generation Operational Reliability and Availability Database,  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeat Pump Models |Conduct, Parent(CRADA and DOW Area 5 LLRWDistributedDepartmentFinal

87

Distributed Generation Operational Reliability, Executive Summary Report,  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeat Pump Models |Conduct, Parent(CRADA and DOW Area 5

88

Sandia National Laboratories: PV Reliability Operations Maintenance  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLSMolten-Salt StorageNoLongAnalysisPVPublicationsdatabase

89

Limited Lawn & Limited Commercial  

E-Print Network [OSTI]

Limited Lawn & Ornamental Limited Commercial Landscape Maintenance Review and Exams Limited for Commercial Landscape Maintenance Application: http://www.flaes.org/ pdf/lndspckt.pdf Limited Certification.floridatermitehelp.org or request by phone at 850-921-4177. Limited Lawn & Ornamental/Limited Commercial Landscape Maintenance

Watson, Craig A.

90

Limited Lawn & Limited Commercial  

E-Print Network [OSTI]

Limited Lawn & Ornamental Limited Commercial Landscape Maintenance Review and Exams Limited-921-4177. Limited Lawn & Ornamental/Limited Commercial Landscape Maintenance: Ornamental and Turf Pest Control (SM 7&O/Structural only). See web locations below for applications. Limited Certification for Commercial Landscape

Jawitz, James W.

91

Response Operations | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Electricity Delivery and Energy Reliability Response Operations Response Operations Overview The federal government primarily plays a coordinating and support role during...

92

Power electronics reliability analysis.  

SciTech Connect (OSTI)

This report provides the DOE and industry with a general process for analyzing power electronics reliability. The analysis can help with understanding the main causes of failures, downtime, and cost and how to reduce them. One approach is to collect field maintenance data and use it directly to calculate reliability metrics related to each cause. Another approach is to model the functional structure of the equipment using a fault tree to derive system reliability from component reliability. Analysis of a fictitious device demonstrates the latter process. Optimization can use the resulting baseline model to decide how to improve reliability and/or lower costs. It is recommended that both electric utilities and equipment manufacturers make provisions to collect and share data in order to lay the groundwork for improving reliability into the future. Reliability analysis helps guide reliability improvements in hardware and software technology including condition monitoring and prognostics and health management.

Smith, Mark A.; Atcitty, Stanley

2009-12-01T23:59:59.000Z

93

Human Reliability Program Overview  

SciTech Connect (OSTI)

This presentation covers the high points of the Human Reliability Program, including certification/decertification, critical positions, due process, organizational structure, program components, personnel security, an overview of the US DOE reliability program, retirees and academia, and security program integration.

Bodin, Michael

2012-09-25T23:59:59.000Z

94

Waste Feed Delivery System Phase 1 Preliminary Reliability and Availability and Maintainability Analysis [SEC 1 and 2  

SciTech Connect (OSTI)

The document presents updated results of the preliminary reliability, availability, maintainability analysis performed for delivery of waste feed from tanks 241-AZ-101 and 241-AN-105 to British Nuclear Fuels Limited, inc. under the Tank Waste Remediation System Privatization Contract. The operational schedule delay risk is estimated and contributing factors are discussed.

CARLSON, A.B.

1999-11-11T23:59:59.000Z

95

Reliability and economy -- Hydro electricity for Iran  

SciTech Connect (OSTI)

Reliability is the probability that a device or system will perform its function adequately, for the period of time intended, under the operating conditions intended. Reliability and economy are two important factors in operating any system, especially in power generation. Due to the high rate in population growth in Iran, the experts have estimated that the demand for electricity will be about 63,000 MW in the next 25 years, the installed power is now about 26,000 MW. Therefore, the energy policy decision made in Iran is to go to power generation by hydroelectric plants because of reliability, availability of water resources and the economics of hydroelectric power.

Jahromi-Shirazi, M.J.; Zarbakhsh, M.H. [Teleh Shofage Co., Ghazvin (Iran, Islamic Republic of)

1998-12-31T23:59:59.000Z

96

Appears in Dependable Systems and Networks (DSN), July 2001 We propose a fault-tolerant approach to reliable micropro-  

E-Print Network [OSTI]

that manufactured parts work reliably in varied (and occasionally adverse) operating conditions. If successful

Austin, Todd M.

97

Application of reliability analysis method to fusion component testing  

SciTech Connect (OSTI)

The term reliability here implies that a component satisfies a set of performance criteria while under specified conditions of use over a specified period of time. For fusion nuclear technology, the reliability goal to be pursued is the development of a mean time between failures (MTBF) for a component which is longer than its lifetime goal. While the component lifetime is mainly determined by the fluence limitation (i.e., damage level) which leads to performance degradation or failure, the MTBF represents an arithmetic average life of all units in a population. One method of assessing the reliability goal involves determining component availability needs to meet the goal plant availability, defining a test-analyze-fix development program to improve component reliability, and quantifying both test times and the number of test articles that would be required to ensure that a specified target MTBF is met. Statistically, constant failure rates and exponential life distributions are assumed for analyses and blanket component development is used as an example. However, as data are collected the probability distribution of the parameter of interest can be updated in a Bayesian fashion. The nuclear component testing program will be structured such that reliability requirements for DEMO can be achieved. The program shall not exclude the practice of a good design (such as reducing the complexity of the system to the minimum essential for the required operation), the execution of high quality manufacturing and inspection processes, and the implication of quality assurance and control for component development. In fact, the assurance of a high quality testing/development program is essential so that there is no question left for reliability.

Ying, A.Y.; Abdou, M.A. [Univ. of California, Los Angeles, CA (United States)

1994-12-31T23:59:59.000Z

98

Human Reliability | ornl.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Human Reliability SHARE Human Reliability The Structured Trusted Employee Program (STEP) Evaluation is an example of a method for identifying, assessing, and retaining reliable and...

99

Reliable Ad Hoc Group Communication using Local Neighborhoods  

E-Print Network [OSTI]

1 Reliable Ad Hoc Group Communication using Local Neighborhoods Lawrence Klos, Golden G. Richard Abstract - In this paper an enhanced reliability protocol added to the ODMRP multicast ad hoc protocol by operational phase. Index Terms ­ Mobile Networking, Ad Hoc Wireless, Multicast, Reliable, ODMRP. I

Richard III, Golden G.

100

Medical Aspects of Reliability  

SciTech Connect (OSTI)

This presentation covers the medical evaluation as part of a human reliability program, particularly the various medical qualifications and potential disqualifiers.

Atencio, Julian J.

2014-05-05T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Reliable High Performance Peta- and Exa-Scale Computing  

SciTech Connect (OSTI)

As supercomputers become larger and more powerful, they are growing increasingly complex. This is reflected both in the exponentially increasing numbers of components in HPC systems (LLNL is currently installing the 1.6 million core Sequoia system) as well as the wide variety of software and hardware components that a typical system includes. At this scale it becomes infeasible to make each component sufficiently reliable to prevent regular faults somewhere in the system or to account for all possible cross-component interactions. The resulting faults and instability cause HPC applications to crash, perform sub-optimally or even produce erroneous results. As supercomputers continue to approach Exascale performance and full system reliability becomes prohibitively expensive, we will require novel techniques to bridge the gap between the lower reliability provided by hardware systems and users unchanging need for consistent performance and reliable results. Previous research on HPC system reliability has developed various techniques for tolerating and detecting various types of faults. However, these techniques have seen very limited real applicability because of our poor understanding of how real systems are affected by complex faults such as soft fault-induced bit flips or performance degradations. Prior work on such techniques has had very limited practical utility because it has generally focused on analyzing the behavior of entire software/hardware systems both during normal operation and in the face of faults. Because such behaviors are extremely complex, such studies have only produced coarse behavioral models of limited sets of software/hardware system stacks. Since this provides little insight into the many different system stacks and applications used in practice, this work has had little real-world impact. My project addresses this problem by developing a modular methodology to analyze the behavior of applications and systems during both normal and faulty operation. By synthesizing models of individual components into a whole-system behavior models my work is making it possible to automatically understand the behavior of arbitrary real-world systems to enable them to tolerate a wide range of system faults. My project is following a multi-pronged research strategy. Section II discusses my work on modeling the behavior of existing applications and systems. Section II.A discusses resilience in the face of soft faults and Section II.B looks at techniques to tolerate performance faults. Finally Section III presents an alternative approach that studies how a system should be designed from the ground up to make resilience natural and easy.

Bronevetsky, G

2012-04-02T23:59:59.000Z

102

Short-term and long-term reliability studies in the deregulated power systems  

E-Print Network [OSTI]

-term reliability in deregulated power systems. Short-term reliability is for operational purposes and is mainly concerned with security. Thus the way energy is dispatched and the actions the system operator takes to remedy an insecure system state...

Li, Yishan

2006-04-12T23:59:59.000Z

103

Medical Device Reliability BIOMATERIALS  

E-Print Network [OSTI]

NEMI Medical Electronics team to address short- and long-term reliability issues with medical devices. OurMedical Device Reliability BIOMATERIALS Our goal is to provide medical device manufacturers, and consistency of active implantable medical devices. These devices, including pacemakers, cardiac defibrillators

104

Hawaii electric system reliability.  

SciTech Connect (OSTI)

This report addresses Hawaii electric system reliability issues; greater emphasis is placed on short-term reliability but resource adequacy is reviewed in reference to electric consumers' views of reliability %E2%80%9Cworth%E2%80%9D and the reserve capacity required to deliver that value. The report begins with a description of the Hawaii electric system to the extent permitted by publicly available data. Electrical engineering literature in the area of electric reliability is researched and briefly reviewed. North American Electric Reliability Corporation standards and measures for generation and transmission are reviewed and identified as to their appropriateness for various portions of the electric grid and for application in Hawaii. Analysis of frequency data supplied by the State of Hawaii Public Utilities Commission is presented together with comparison and contrast of performance of each of the systems for two years, 2010 and 2011. Literature tracing the development of reliability economics is reviewed and referenced. A method is explained for integrating system cost with outage cost to determine the optimal resource adequacy given customers' views of the value contributed by reliable electric supply. The report concludes with findings and recommendations for reliability in the State of Hawaii.

Silva Monroy, Cesar Augusto; Loose, Verne William

2012-09-01T23:59:59.000Z

105

Operations and Maintenance Program Measurement  

Broader source: Energy.gov [DOE]

Operations and maintenance (O&M) measurement tends to focus on reliability as the sole metric. Every Federal agency wants a reliable facility, but this metric alone is not enough to build a...

106

Photovoltaic system reliability  

SciTech Connect (OSTI)

This paper discusses the reliability of several photovoltaic projects including SMUD`s PV Pioneer project, various projects monitored by Ascension Technology, and the Colorado Parks project. System times-to-failure range from 1 to 16 years, and maintenance costs range from 1 to 16 cents per kilowatt-hour. Factors contributing to the reliability of these systems are discussed, and practices are recommended that can be applied to future projects. This paper also discusses the methodology used to collect and analyze PV system reliability data.

Maish, A.B.; Atcitty, C. [Sandia National Labs., NM (United States); Greenberg, D. [Ascension Technology, Inc., Lincoln Center, MA (United States)] [and others

1997-10-01T23:59:59.000Z

107

Reliability and Safety  

Broader source: Energy.gov [DOE]

DOE solar reliability and safety research and development (R&D) focuses on testing photovoltaic (PV) modules, inverters, and systems for long-term performance, and helping investors, consumers,...

108

Modelling Reliability of Train Arrival Times  

E-Print Network [OSTI]

This paper deals with the scheduling of trains so as to minimise train trip times, whilst maximising reliability of arrival times. The amount of risk of delay associated with a schedule is used as the reliability component of a constrained schedule optimisation model. The paper outlines the model developed to quantify the risk of delays to individual trains, as well as to specific track segments and to the schedule as a whole. The risk model, which deals with single track operations, can be used to estimate the likely impact on reliability of arrival times of changes in train frequencies and operating practices; track and station infrastructure investment strategies; and train technology upgrading. An application of the model to the optimisation of schedules on a track corridor is described. The results obtained using the model are compared with the schedules used by train operations planning staff, in terms of overall delay and timetable reliability. The results highlight the significance of including a measure of timetable reliability, such as risk of delays, in the objective function for scheduling optimisation.

L. Ferreira; A. Higgins

109

Apply reliability centered maintenance to sealless pumps  

SciTech Connect (OSTI)

This paper reports on reliability centered maintenance (RCM) which is considered a crucial part of future reliability engineering. RCM determines the maintenance requirements of plants and equipment in their operating context. The RCM method has been applied to the management of critical sealless pumps in fire/toxic risk services, typical of the petrochemical industry. The method provides advantages from a detailed study of any critical engineering system. RCM is a team exercise and fosters team spirit in the plant environment. The maintenance strategy that evolves is based on team decisions and relies on maximizing the inherent reliability built into the equipment. RCM recommends design upgrades where this inherent reliability is being questioned. Sealless pumps of canned motor design are used as main reactor charge pumps in PVC plants. These pumps handle fresh vinyl chloride monomer (VCM), which is both carcinogenic and flammable.

Pradhan, S. (Exxon Chemicals Canada, Ontario (Canada))

1993-01-01T23:59:59.000Z

110

Parametric probability distributions in reliability  

E-Print Network [OSTI]

Parametric probability distributions in reliability F.P.A. Coolen Department of Mathematical parametric probability distributions which are frequently used in reliability. We present some main as models for specific reliability scenarios. Keywords: Binomial distribution, Exponential distribution

Coolen, Frank

111

Gearbox Reliability Collaborative Update (Presentation)  

SciTech Connect (OSTI)

This presentation was given at the Sandia Reliability Workshop in August 2013 and provides information on current statistics, a status update, next steps, and other reliability research and development activities related to the Gearbox Reliability Collaborative.

Sheng, S.

2013-10-01T23:59:59.000Z

112

Photovoltaic module reliability workshop  

SciTech Connect (OSTI)

The paper and presentations compiled in this volume form the Proceedings of the fourth in a series of Workshops sponsored by Solar Energy Research Institute (SERI/DOE) under the general theme of photovoltaic module reliability during the period 1986--1990. The reliability Photo Voltaic (PV) modules/systems is exceedingly important along with the initial cost and efficiency of modules if the PV technology has to make a major impact in the power generation market, and for it to compete with the conventional electricity producing technologies. The reliability of photovoltaic modules has progressed significantly in the last few years as evidenced by warranties available on commercial modules of as long as 12 years. However, there is still need for substantial research and testing required to improve module field reliability to levels of 30 years or more. Several small groups of researchers are involved in this research, development, and monitoring activity around the world. In the US, PV manufacturers, DOE laboratories, electric utilities and others are engaged in the photovoltaic reliability research and testing. This group of researchers and others interested in this field were brought together under SERI/DOE sponsorship to exchange the technical knowledge and field experience as related to current information in this important field. The papers presented here reflect this effort.

Mrig, L. (ed.)

1990-01-01T23:59:59.000Z

113

Increasing the Reliability of Reliability Jochen Brocker1,  

E-Print Network [OSTI]

Increasing the Reliability of Reliability Diagrams Jochen Br¨ocker1, and Leonard A. Smith1,2 1 University Oxford, UK Corresponding Author, cats@lse.ac.uk November 9, 2006 #12;Abstract The reliability are reliable. Further, an alternative presentation of the same information on probability paper easies

Stevenson, Paul

114

BUILD RELIABILITY INTO EVERY PROJECT Researchers in the engineering industry and  

E-Print Network [OSTI]

1180 FL BUILD RELIABILITY INTO EVERY PROJECT Researchers in the engineering industry and academia are making important advances on reliability-based design and modeling of uncer- tainty when data is limited, Engineering Design Reliability Handbook is a valuable addition to the reliability literature. It presents

Kreinovich, Vladik

115

RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS  

E-Print Network [OSTI]

RESILIENCE; OR RELIABILITY SENSITIVITy .. RiskReliability Planning: Preliminary Definitions.Dioision, Ext. 6782 Reliability Planning in Distributed

Kahn, E.

2011-01-01T23:59:59.000Z

116

North American Electric Reliability Corporation Interconnections...  

Office of Environmental Management (EM)

North American Electric Reliability Corporation Interconnections North American Electric Reliability Corporation Interconnections Map of the North American Electric Reliability...

117

Reliability of functional localization using fMRI Khena M. Swallow, Todd S. Braver, Abraham Z. Snyder, Nicole K. Speer,  

E-Print Network [OSTI]

Reliability of functional localization using fMRI Khena M. Swallow, Todd S. Braver, Abraham Z on the reliability of the methods used to define these regions of interest. Two operations may affect the reliability for each participant). The effect of these two operations on reliability was evaluated for two functionally

Zacks, Jeffrey M.

118

Software Reliability Modeling James LEDOUX  

E-Print Network [OSTI]

Software Reliability Modeling James LEDOUX Centre de Math´ematiques INSA & IRMAR 20 Avenue des an overview of some aspects of Software Reliability (SR) engineering. Most systems are now driven by software in reliability engineering, particularly in terms of cost. But predicting software reliability is not easy

Paris-Sud XI, Université de

119

Reliability of Electrical Interconnects (Presentation)  

SciTech Connect (OSTI)

This presentation discusses the status of NREL's research on the reliability of electrical interconnects.

Devoto, D.

2014-06-01T23:59:59.000Z

120

Gearbox Reliability Collaborative Update: A Brief (Presentation)  

SciTech Connect (OSTI)

This presentation is an update on the Gearbox Reliability Collaborative (GRC) for the AWEA Wind Project Operations, Maintenance & Reliability Seminar. GRC accomplishments are: (1) Failure database software deployed - partners see business value for themselves and customers; (2) Designed, built, instrumented, and tested two gearboxes - (a) Generated unprecedented public domain test data from both field testing and dynamometer testing, (b) Different responses from 'identical' gearboxes, (c) Demonstrated importance of non-torque loading and modeling approach; and (3) Active collaborative, with wide industry support, leveraging DOE funding - Modeling round robin and Condition Monitoring round robin.

Sheng, S.; Keller, J.; McDade, M.

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Operating Efficiency Comes From Teamwork  

E-Print Network [OSTI]

A group of operating and planning personnel formed the INter Plant Utilities Team [INPUT] to improve energy efficiency and reliability for Exxon's Baytown, Texas, refinery and chemical plants complex. The Team coordinates the day-to-day operations...

Relyea, D. L.; Stone, A.

122

Thermal-Hydraulic Bases for the Safety Limits and Limiting Safety System Settings for HFIR Operation at 100 MW and 468 psig Primary Pressure, Using Specially Selected Fuel Elements  

SciTech Connect (OSTI)

This report summarizes thermal hydraulic analyses performed to support HFIR operation at 100 MW and 468 psig pressure using specially selected fuel elements. The analyses were performed with the HFIR steady state heat transfer code, originally developed during HFIR design. This report addresses the increased core heat removal capability which can be achieved in fuel elements having coolant channel thicknesses that exceed the minimum requirements of the HFIR fuel fabrication specifications. Specific requirements for the minimum value of effective uniform as-built coolant channel thickness are established for fuel elements to be used at 100 MW. The burnout correlation currently used in the steady-state heat transfer code was also compared with more recent experimental results for stability of high-velocity flow in narrow heated channels, and the burnout correlation was found to be conservative with respect to flow stability at typical HFIR hot channel exit conditions at full power.

Rothrock, R.B.

1998-09-01T23:59:59.000Z

123

Human Reliability Program Workshop  

SciTech Connect (OSTI)

A Human Reliability Program (HRP) is designed to protect national security as well as worker and public safety by continuously evaluating the reliability of those who have access to sensitive materials, facilities, and programs. Some elements of a site HRP include systematic (1) supervisory reviews, (2) medical and psychological assessments, (3) management evaluations, (4) personnel security reviews, and (4) training of HRP staff and critical positions. Over the years of implementing an HRP, the Department of Energy (DOE) has faced various challenges and overcome obstacles. During this 4-day activity, participants will examine programs that mitigate threats to nuclear security and the insider threat to include HRP, Nuclear Security Culture (NSC) Enhancement, and Employee Assistance Programs. The focus will be to develop an understanding of the need for a systematic HRP and to discuss challenges and best practices associated with mitigating the insider threat.

Landers, John; Rogers, Erin; Gerke, Gretchen

2014-05-18T23:59:59.000Z

124

A reliability assessment methodology for distribution systems with distributed generation  

E-Print Network [OSTI]

Reliability assessment is of primary importance in designing and planning distribution systems that operate in an economic manner with minimal interruption of customer loads. With the advances in renewable energy sources, Distributed Generation (DG...

Duttagupta, Suchismita Sujaya

2006-08-16T23:59:59.000Z

125

Experiences with Two Reliability Data Collection Efforts (Presentation)  

SciTech Connect (OSTI)

This presentation, given by NREL at the Wind Reliability Experts Meeting in Albuquerque, New Mexico, outlines the causes of wind plant operational expenditures and gearbox failures and describes NREL's efforts to create a gearbox failure database.

Sheng, S.; Lantz, E.

2013-08-01T23:59:59.000Z

126

Final report for CCS cross-layer reliability visioning study  

SciTech Connect (OSTI)

The geometric rate of improvement of transistor size and integrated circuit performance known as Moore's Law has been an engine of growth for our economy, enabling new products and services, creating new value and wealth, increasing safety, and removing menial tasks from our daily lives. Affordable, highly integrated components have enabled both life-saving technologies and rich entertainment applications. Anti-lock brakes, insulin monitors, and GPS-enabled emergency response systems save lives. Cell phones, internet appliances, virtual worlds, realistic video games, and mp3 players enrich our lives and connect us together. Over the past 40 years of silicon scaling, the increasing capabilities of inexpensive computation have transformed our society through automation and ubiquitous communications. Looking forward, increasing unpredictability threatens our ability to continue scaling integrated circuits at Moore's Law rates. As the transistors and wires that make up integrated circuits become smaller, they display both greater differences in behavior among devices designed to be identical and greater vulnerability to transient and permanent faults. Conventional design techniques expend energy to tolerate this unpredictability by adding safety margins to a circuit's operating voltage, clock frequency or charge stored per bit. However, the rising energy costs needed to compensate for increasing unpredictability are rapidly becoming unacceptable in today's environment where power consumption is often the limiting factor on integrated circuit performance and energy efficiency is a national concern. Reliability and energy consumption are both reaching key inflection points that, together, threaten to reduce or end the benefits of feature size reduction. To continue beneficial scaling, we must use a cross-layer, Jull-system-design approach to reliability. Unlike current systems, which charge every device a substantial energy tax in order to guarantee correct operation in spite of rare events, such as one high-threshold transistor in a billion or one erroneous gate evaluation in an hour of computation, cross-layer reliability schemes make reliability management a cooperative effort across the system stack, sharing information across layers so that they only expend energy on reliability when an error actually occurs. Figure 1 illustrates an example of such a system that uses a combination of information from the application and cheap architecture-level techniques to detect errors. When an error occurs, mechanisms at higher levels in the stack correct the error, efficiently delivering correct operation to the user in spite of errors at the device or circuit levels. In the realms of memory and communication, engineers have a long history of success in tolerating unpredictable effects such as fabrication variability, transient upsets, and lifetime wear using information sharing, limited redundancy, and cross-layer approaches that anticipate, accommodate, and suppress errors. Networks use a combination of hardware and software to guarantee end-toend correctness. Error-detection and correction codes use additional information to correct the most common errors, single-bit transmission errors. When errors occur that cannot be corrected by these codes, the network protocol requests re-transmission of one or more packets until the correct data is received. Similarly, computer memory systems exploit a cross-layer division of labor to achieve high performance with modest hardware. Rather than demanding that hardware alone provide the virtual memory abstraction, software page-fault and TLB-miss handlers allow a modest piece of hardware, the TLB, to handle the common-case operations on a cyc1e-by-cycle basis while infrequent misses are handled in system software. Unfortunately, mitigating logic errors is not as simple or as well researched as memory or communication systems. This lack of understanding has led to very expensive solutions. For example, triple-modular redundancy masks errors by triplicating computations in either time or area. T

Quinn, Heather M [Los Alamos National Laboratory; Dehon, Andre [U. PENN; Carter, Nicj [INTEL

2010-12-20T23:59:59.000Z

127

Continuous Reliability Enhancement for Wind (CREW) database : wind plant reliability benchmark.  

SciTech Connect (OSTI)

To benchmark the current U.S. wind turbine fleet reliability performance and identify the major contributors to component-level failures and other downtime events, the Department of Energy funded the development of the Continuous Reliability Enhancement for Wind (CREW) database by Sandia National Laboratories. This report is the third annual Wind Plant Reliability Benchmark, to publically report on CREW findings for the wind industry. The CREW database uses both high resolution Supervisory Control and Data Acquisition (SCADA) data from operating plants and Strategic Power Systems' ORAPWind%C2%AE (Operational Reliability Analysis Program for Wind) data, which consist of downtime and reserve event records and daily summaries of various time categories for each turbine. Together, these data are used as inputs into CREW's reliability modeling. The results presented here include: the primary CREW Benchmark statistics (operational availability, utilization, capacity factor, mean time between events, and mean downtime); time accounting from an availability perspective; time accounting in terms of the combination of wind speed and generation levels; power curve analysis; and top system and component contributors to unavailability.

Hines, Valerie Ann-Peters; Ogilvie, Alistair B.; Bond, Cody R.

2013-09-01T23:59:59.000Z

128

Office of Enterprise Assessments Operational Awareness Record for the Waste Isolation Pilot Plant Limited Review of Engineering Configuration Management - March 2015  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F SSales LLC OrderEfficiencyOceanOctober XX,/2012noteOperational(EA)

129

Reliability and Design Strength Limit Calculations on Diesel...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Corning 2004deerwebb.pdf More Documents & Publications Predicting Thermal Stress in Diesel Particulate Filters Environmental Effects on Power Electronic Devices Effect of...

130

Reliability and Design Strength Limit Calculations on Diesel Particulate  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L dDepartmentnews-flashes OfficeTexas |4Webinar MayDepartmentFilters |

131

Reliable solar: powering communities  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive Solar HomePromising ScienceRecentRegionalReliability Technology earns

132

Real Time Grid Reliability Management 2005  

SciTech Connect (OSTI)

The increased need to manage California?s electricity grid in real time is a result of the ongoing transition from a system operated by vertically-integrated utilities serving native loads to one operated by an independent system operator supporting competitive energy markets. During this transition period, the traditional approach to reliability management -- construction of new transmission lines -- has not been pursued due to unresolved issues related to the financing and recovery of transmission project costs. In the absence of investments in new transmission infrastructure, the best strategy for managing reliability is to equip system operators with better real-time information about actual operating margins so that they can better understand and manage the risk of operating closer to the edge. A companion strategy is to address known deficiencies in offline modeling tools that are needed to ground the use of improved real-time tools. This project: (1) developed and conducted first-ever demonstrations of two prototype real-time software tools for voltage security assessment and phasor monitoring; and (2) prepared a scoping study on improving load and generator response models. Additional funding through two separate subsequent work authorizations has already been provided to build upon the work initiated in this project.

Eto, Joe; Eto, Joe; Lesieutre, Bernard; Lewis, Nancy Jo; Parashar, Manu

2008-07-07T23:59:59.000Z

133

Wind turbine reliability : a database and analysis approach.  

SciTech Connect (OSTI)

The US wind Industry has experienced remarkable growth since the turn of the century. At the same time, the physical size and electrical generation capabilities of wind turbines has also experienced remarkable growth. As the market continues to expand, and as wind generation continues to gain a significant share of the generation portfolio, the reliability of wind turbine technology becomes increasingly important. This report addresses how operations and maintenance costs are related to unreliability - that is the failures experienced by systems and components. Reliability tools are demonstrated, data needed to understand and catalog failure events is described, and practical wind turbine reliability models are illustrated, including preliminary results. This report also presents a continuing process of how to proceed with controlling industry requirements, needs, and expectations related to Reliability, Availability, Maintainability, and Safety. A simply stated goal of this process is to better understand and to improve the operable reliability of wind turbine installations.

Linsday, James (ARES Corporation); Briand, Daniel; Hill, Roger Ray; Stinebaugh, Jennifer A.; Benjamin, Allan S. (ARES Corporation)

2008-02-01T23:59:59.000Z

134

Systems reliability analysis for the national ignition facility  

SciTech Connect (OSTI)

A Reliability, Availability and Maintainability (RAM) analysis was initiated for the National Ignition Facility (NIF). The NIF is an inertial confinement fusion research facility designed to achieve controlled thermonuclear reaction; the preferred site for the NIF is the Lawrence Livermore National Laboratory (LLNL). The NIF RAM analysis has three purposes: (1) to allocate top level reliability and availability goals for the systems, (2) to develop an operability model for optimum maintainability, and (3) to determine the achievability of the allocated goals of the RAM parameters for the NIF systems and the facility operation as a whole. An allocation model assigns the reliability and availability goals for front line and support systems by a top-down approach; reliability analysis uses a bottom-up approach to determine the system reliability and availability from component level to system level.

Majumdar, K.C.; Annese, C.E.; MacIntyre, A.T.; Sicherman, A.

1996-06-12T23:59:59.000Z

135

ARMY VEHICLE DURABILITY OPTIMIZATION & RELIABILITY  

E-Print Network [OSTI]

ARMY VEHICLE DURABILITY OPTIMIZATION & RELIABILITY How to Optimize the Vehicle Design to Minimize/Reduce the Weight? Under These Uncertainties, How to Achieve Component Level Reliability? Under These Uncertainties, How to Achieve System Level Reliability? Dynamics Analysis FE Model System Model Dynamic Stress

Kusiak, Andrew

136

FIELD RELIABILITY OF ELECTRONIC SYSTEMS  

E-Print Network [OSTI]

I Ww i 1 i FIELD RELIABILITY OF ELECTRONIC SYSTEMS wcwotoias R I S 0 - M - 2 4 1 8 An analytical study of in-the fiald axparlanca of electronics reliability Tag© Elm Rise National Laboratory, DK-4000 Roskilde, Denmark February 1 0 8 4 #12;RIS?-M-2418 FIELD RELIABILITY OP ELECTRONIC SYSTEMS An analytical

137

Reliability onMultilayerModels  

E-Print Network [OSTI]

Network Reliability Analysis Based onMultilayerModels László Jereb, Péter Bajor, Attila Kiss a reliability analysis approach which is based on the multilayer model of the telecommunication network. Simple two­state reliability models are assigned to the network elements making it possible to describe

László, Jereb

138

Testing for PV Reliability (Presentation)  

SciTech Connect (OSTI)

The DOE SUNSHOT workshop is seeking input from the community about PV reliability and how the DOE might address gaps in understanding. This presentation describes the types of testing that are needed for PV reliability and introduces a discussion to identify gaps in our understanding of PV reliability testing.

Kurtz, S.; Bansal, S.

2014-09-01T23:59:59.000Z

139

Load Response Fundamentally Matches Power System Reliability Requirements  

SciTech Connect (OSTI)

Responsive load is the most underutilized reliability resource available to the power system. Loads are frequently barred from providing the highest value and most critical reliability services; regulation and spinning reserve. Advances in communications and control technology now make it possible for some loads to provide both of these services. The limited storage incorporated in some loads better matches their response capabilities to the fast reliability-service markets than to the hourly energy markets. Responsive loads are frequently significantly faster and more accurate than generators, increasing power system reliability. Incorporating fast load response into microgrids further extends the reliability response capabilities that can be offered to the interconnected power system. The paper discusses the desired reliability responses, why this matches some loads' capabilities, what the advantages are for the power system, implications for communications and monitoring requirements, and how this resource can be exploited.

Kirby, Brendan J [ORNL] [ORNL

2007-01-01T23:59:59.000Z

140

Assessment of microelectronics packaging for high temperature, high reliability applications  

SciTech Connect (OSTI)

This report details characterization and development activities in electronic packaging for high temperature applications. This project was conducted through a Department of Energy sponsored Cooperative Research and Development Agreement between Sandia National Laboratories and General Motors. Even though the target application of this collaborative effort is an automotive electronic throttle control system which would be located in the engine compartment, results of this work are directly applicable to Sandia`s national security mission. The component count associated with the throttle control dictates the use of high density packaging not offered by conventional surface mount. An enabling packaging technology was selected and thermal models defined which characterized the thermal and mechanical response of the throttle control module. These models were used to optimize thick film multichip module design, characterize the thermal signatures of the electronic components inside the module, and to determine the temperature field and resulting thermal stresses under conditions that may be encountered during the operational life of the throttle control module. Because the need to use unpackaged devices limits the level of testing that can be performed either at the wafer level or as individual dice, an approach to assure a high level of reliability of the unpackaged components was formulated. Component assembly and interconnect technologies were also evaluated and characterized for high temperature applications. Electrical, mechanical and chemical characterizations of enabling die and component attach technologies were performed. Additionally, studies were conducted to assess the performance and reliability of gold and aluminum wire bonding to thick film conductor inks. Kinetic models were developed and validated to estimate wire bond reliability.

Uribe, F.

1997-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) Quality Assurance Manual  

SciTech Connect (OSTI)

The Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) is a software application developed for performing a complete probabilistic risk assessment using a personal computer running the Microsoft Windows operating system. SAPHIRE is primarily funded by the U.S. Nuclear Regulatory Commission (NRC). The role of the INL in this project is that of software developer and tester. This development takes place using formal software development procedures and is subject to quality assurance (QA) processes. The purpose of this document is to describe how the SAPHIRE software QA is performed for Version 6 and 7, what constitutes its parts, and limitations of those processes.

C. L. Smith; R. Nims; K. J. Kvarfordt; C. Wharton

2008-08-01T23:59:59.000Z

142

Instrumentation Report No. 3: performance and reliability of instrumentation deployed for the Spent Fuel Test - Climax  

SciTech Connect (OSTI)

A demonstration of the short-term storage and subsequent retrieval of spent nuclear fuel assemblies was successfully completed at the US Department of Energy`s Nevada Test Site. Nearly 1000 instruments were deployed to monitor the temperature of rock, air, and metallic components of the test; displacements and stress changes within the rock mass; radiation dosage to personnel and to the rock; thermal energy input; characteristics of the ventilation airstream; and the operational status of the test. Careful selection, installation, calibration, and maintenance of these instruments ensured the acquisition of about 15.3 x 10{sup 6} high-quality data points. With few exceptions, the performance and reliability of the instrumentation and associated data acquisition system (DAS) were within specified acceptable limits. Details of the performance and reliability of the instrumentation are discussed in this report. 42 figs., 32 tabs.

Patrick, W.C.; Rector, N.L.; Scarafiotti, J.J.

1984-12-01T23:59:59.000Z

143

Analysis of operational, institutional and international limitations for alternative fuel vehicles and technologies: Means/methods for implementing changes. [Public fleet groups--information needs  

SciTech Connect (OSTI)

This project focused upon the development of an approach to assist public fleet managers in evaluating the characteristics and availability of alternative fuels (AF's) and alternative fuel vehicles (AFV's) that will serve as possible replacements for vehicles currently serving the needs of various public entities. Also of concern were the institutional/international limitations for alternative fuels and alternative fuel vehicles. The City of Detroit and other public agencies in the Detroit area were the particular focus for the activities. As the development and initial stages of use of alternative fuels and alternative fuel vehicles proceeds, there will be an increasing need to provide information and guidance to decision-makers regarding differences in requirements and features of these fuels and vehicles. There wig be true differences in requirements for servicing, managing, and regulating. There will also be misunderstanding and misperception. There have been volumes of data collected on AFV'S, and as technology is improved, new data is constantly added. There are not, however, condensed and effective sources of information for public vehicle fleet managers on vehicle and equipment sources, characteristics, performance, costs, and environmental benefits. While theoretical modeling of public fleet requirements has been done, there do not seem to be readily available practical''. There is a need to provide the best possible information and means to minimize the problems for introducing the effective use of alternative fuels and alternative fuel vehicles.

Not Available

1992-07-01T23:59:59.000Z

144

Reliability assessment of autonomous power systems incorporating HVDC interconnection links  

SciTech Connect (OSTI)

The objective of this paper is to present an improved computational method for the overall reliability assessment of autonomous power systems that may or may not contain HVdc interconnection links. This is a hybrid method based on a Monte-Carlo simulation sequential approach which incorporates an analytical approach for the reliability modeling of the HVdc transmission links. The developed models and techniques have been implemented into a computer program that can be used to simulate the operational practices and characteristics of the overall system under study efficiently and realistically. A set of reliability indices are calculated for each load-point of interest and the entire system while a set of additional indices is calculated for quantifying the reliability performance of the interconnection links under the specified operating requirements. The analysis of a practical system is also included for a number of studies representing its various operating and design characteristics.

Dialynas, E.N.; Koskolos, N.C. [National Technical Univ., Athens (Greece). Dept. of Electrical and Computer Engineering] [National Technical Univ., Athens (Greece). Dept. of Electrical and Computer Engineering; Agoris, D. [Public Power Corp., Athens (Greece)] [Public Power Corp., Athens (Greece)

1996-01-01T23:59:59.000Z

145

Maximal Reliability for Unit-weighted Composites  

E-Print Network [OSTI]

precisely measure scale reliability. In H. Yanai, A. Okada,A useful indicator of reliability? Personality & IndividualJ. M. F. (2000). Linking reliability and factor analysis:

Peter M. Bentler

2011-01-01T23:59:59.000Z

146

RELIABILITY IMPROVEMENT OF BART TRAIN CONTROL  

E-Print Network [OSTI]

it was a response to the reliability problems introduced by~atelyowned rights. RELIABILITY IMPROVEMENT OF BART VEHICLEtask group to improve the reliability of the Bay Area Rapid

Turner, D.B.

2011-01-01T23:59:59.000Z

147

Microgrids and Heterogeneous Power Quality and Reliability  

E-Print Network [OSTI]

high security, quality, reliability, and availability, IEEELave, and Marija Ilic: Creating Reliability Choice: HowBuilding Less Reliability into Electric Power Grids Could

Marnay, Chris

2008-01-01T23:59:59.000Z

148

CERTS: Consortium for Electric Reliability Technology Solutions - Research Highlights  

SciTech Connect (OSTI)

Historically, the U.S. electric power industry was vertically integrated, and utilities were responsible for system planning, operations, and reliability management. As the nation moves to a competitive market structure, these functions have been disaggregated, and no single entity is responsible for reliability management. As a result, new tools, technologies, systems, and management processes are needed to manage the reliability of the electricity grid. However, a number of simultaneous trends prevent electricity market participants from pursuing development of these reliability tools: utilities are preoccupied with restructuring their businesses, research funding has declined, and the formation of Independent System Operators (ISOs) and Regional Transmission Organizations (RTOs) to operate the grid means that control of transmission assets is separate from ownership of these assets; at the same time, business uncertainty, and changing regulatory policies have created a climate in which needed investment for transmission infrastructure and tools for reliability management has dried up. To address the resulting emerging gaps in reliability R&D, CERTS has undertaken much-needed public interest research on reliability technologies for the electricity grid. CERTS' vision is to: (1) Transform the electricity grid into an intelligent network that can sense and respond automatically to changing flows of power and emerging problems; (2) Enhance reliability management through market mechanisms, including transparency of real-time information on the status of the grid; (3) Empower customers to manage their energy use and reliability needs in response to real-time market price signals; and (4) Seamlessly integrate distributed technologies--including those for generation, storage, controls, and communications--to support the reliability needs of both the grid and individual customers.

Eto, Joseph

2003-07-30T23:59:59.000Z

149

MULTIAREA SYSTEM RELIABILITY: THE ECONOMIC EVALUATION OF SYSTEM SECURITY CRITERIA  

E-Print Network [OSTI]

MULTIAREA SYSTEM RELIABILITY: THE ECONOMIC EVALUATION OF SYSTEM SECURITY CRITERIA BY TEOMAN GULER B assessment studies and the quantification of the economics of secure power system operations security and the economics of secure operations in the competitive market environment. The advent

Gross, George

150

Performance and Reliability of Interface Materials for Automotive Power Electronics (Presentation)  

SciTech Connect (OSTI)

Thermal management and reliability are important because excessive temperature can degrade the performance, life, and reliability of power electronics and electric motors. Advanced thermal management technologies enable keeping temperature within limits; higher power densities; and lower cost materials, configurations and systems. Thermal interface materials, bonded interface materials and the reliability of bonded interfaces are discussed in this presentation.

Narumanchi, S.; DeVoto, D.; Mihalic, M.; Paret, P.

2013-07-01T23:59:59.000Z

151

Reliability Assessment of Fault-Tolerant Dc-Dc Converters for Photovoltaic Applications  

E-Print Network [OSTI]

Reliability Assessment of Fault-Tolerant Dc-Dc Converters for Photovoltaic Applications Sairaj V performance and reliability analysis of switch-mode, dc-dc power converters employed as front ends of the converter's steady-state operation on device failure rates. Markov reliability models are derived to assess

Liberzon, Daniel

152

Reliability Modeling of Cyber-Physical Electric Power Systems: A System-Theoretic Framework  

E-Print Network [OSTI]

1 Reliability Modeling of Cyber-Physical Electric Power Systems: A System-Theoretic Framework systematic reliability analysis tools to address planning and operation challenges of future electric power and the introduction of new sources of uncertainty in systems already inherently complex. Current reliability analysis

Liberzon, Daniel

153

Power Reliability at BASF Corporation  

E-Print Network [OSTI]

Power Reliability at BASF Corporation Thomas R. Theising Energy Systems Manager BASF Corporation ABSTRACT: Quality is defined not as what the supplier puts into the product but what the customer gets out and is willing to pay for. Power... of overcoming these problems. The approach of addressing the reliability of its utility systems is common within BASF. This paper will address one of BASF?s approaches to addressing Power Reliability. PROBLEM RECOGNITION: The first issue to address...

Theising, T. R.

2011-01-01T23:59:59.000Z

154

Power Reliability at BASF Corporation  

E-Print Network [OSTI]

Power Reliability at BASF Corporation Thomas R. Theising Energy Systems Manager BASF Corporation ABSTRACT: Quality is defined not as what the supplier puts into the product but what the customer gets out and is willing to pay for. Power... of overcoming these problems. The approach of addressing the reliability of its utility systems is common within BASF. This paper will address one of BASF?s approaches to addressing Power Reliability. PROBLEM RECOGNITION: The first issue to address...

Theising, T. R.

2012-01-01T23:59:59.000Z

155

CSD Safety and Reliability Data  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Reliability Data Forecourt CSD Workshop Argonne National Laboratory Kevin Harrison 20-Mar-2013 2 Approach - Composite Data Products CDPs DDPs Results Internal analysis completed...

156

High Reliability R-10 Windows Using Vacuum Insulating Glass Units  

SciTech Connect (OSTI)

The objective of this effort was for EverSealed Windows (EverSealed or ESW) to design, assemble, thermally and environmentally test and demonstrate a Vacuum Insulating Glass Unit (VIGU or VIG) that would enable a whole window to meet or exceed the an R-10 insulating value (U-factor ? 0.1). To produce a VIGU that could withstand any North American environment, ESW believed it needed to design, produce and use a flexible edge seal system. This is because a rigid edge seal, used by all other know VIG producers and developers, limits the size and/or thermal environment of the VIG to where the unit is not practical for typical IG sizes and cannot withstand severe outdoor environments. The rigid-sealed VIGs use would be limited to mild climates where it would not have a reasonable economic payback when compared to traditional double-pane or triple-pane IGs. ESWs goals, in addition to achieving a sufficiently high R-value to enable a whole window to achieve R-10, included creating a VIG design that could be produced for a cost equal to or lower than a traditional triple-pane IG (low-e, argon filled). ESW achieved these goals. EverSealed produced, tested and demonstrated a flexible edge-seal VIG that had an R-13 insulating value and the edge-seal system durability to operate reliably for at least 40 years in the harshest climates of North America.

Stark, David

2012-08-16T23:59:59.000Z

157

NORTH AMERICAN ELECTRIC RELIABILITY COUNCIL: Preliminary Disturbance...  

Broader source: Energy.gov (indexed) [DOE]

NORTH AMERICAN ELECTRIC RELIABILITY COUNCIL: Preliminary Disturbance Report NORTH AMERICAN ELECTRIC RELIABILITY COUNCIL: Preliminary Disturbance Report The following information...

158

Reliability Estimation for Double Containment Piping  

SciTech Connect (OSTI)

Double walled or double containment piping is considered for use in the ITER international project and other next-generation fusion device designs to provide an extra barrier for tritium gas and other radioactive materials. The extra barrier improves confinement of these materials and enhances safety of the facility. This paper describes some of the design challenges in designing double containment piping systems. There is also a brief review of a few operating experiences of double walled piping used with hazardous chemicals in different industries. This paper recommends approaches for the reliability analyst to use to quantify leakage from a double containment piping system in conceptual and more advanced designs. The paper also cites quantitative data that can be used to support such reliability analyses.

L. Cadwallader; T. Pinna

2012-08-01T23:59:59.000Z

159

Applying Reliability Models to the Space Shuttle  

E-Print Network [OSTI]

Applying Reliability Models to the Space Shuttle Norman F. Schneidewind Ted W. Keller #12;What are Reliability Models? Reliability Models are tools that Help Us: · Predict software Reliability. · Control software Reliability. · Assess software Reliability. This functions let an organization determine

Feitelson, Dror

160

Increasing positive displacement charging pump reliability  

SciTech Connect (OSTI)

The use of positive displacement pumps in many PWRs is an integral part of providing reactivity control via the Chemical and Volume Control system. This usually requires the continuous operation of at least one pump, typically with a flow rate of 44 gpm {at} 2,310 psig (167 lpm {at} 160 bar). Some PWRs use multiple pumps, and vary the letdown, while others use variable speed pumps. Regardless, the charging pumps run continuously. With the amount of reciprocating mass, differential pressure, and friction, it is a battle to maintain the pumps in peak operating condition for long periods of time. This paper will show how Entergy Operations` Waterford 3 SES was able to increase the reliability of the positive displacement Charging Pumps. Many different solutions were evaluated, and several adopted. The results are undeniable, as availability has increased and O and M costs have been reduced by 90% over 6 years.

Wade, J.H. III [Entergy Operations, Inc., Killona, LA (United States)

1996-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

FORMAL SEMANTICS AND VERIFICATION OF DYNAMIC RELIABILITY BLOCK DIAGRAMS FOR SYSTEM RELIABILITY MODELING  

E-Print Network [OSTI]

FORMAL SEMANTICS AND VERIFICATION OF DYNAMIC RELIABILITY BLOCK DIAGRAMS FOR SYSTEM RELIABILITY captured by existing reliability modeling tools. In this paper, we introduce a new reliability modeling tool, called dynamic reliability block diagrams (DRBD), for modeling dynamic relationships between

Xu, Haiping

162

Photovoltaic performance and reliability workshop  

SciTech Connect (OSTI)

This workshop was the sixth in a series of workshops sponsored by NREL/DOE under the general subject of photovoltaic testing and reliability during the period 1986--1993. PV performance and PV reliability are at least as important as PV cost, if not more. In the US, PV manufacturers, DOE laboratories, electric utilities, and others are engaged in the photovoltaic reliability research and testing. This group of researchers and others interested in the field were brought together to exchange the technical knowledge and field experience as related to current information in this evolving field of PV reliability. The papers presented here reflect this effort since the last workshop held in September, 1992. The topics covered include: cell and module characterization, module and system testing, durability and reliability, system field experience, and standards and codes.

Mrig, L. [ed.

1993-12-01T23:59:59.000Z

163

Individual Differences in Human Reliability Analysis  

SciTech Connect (OSTI)

While human reliability analysis (HRA) methods include uncertainty in quantification, the nominal model of human error in HRA typically assumes that operator performance does not vary significantly when they are given the same initiating event, indicators, procedures, and training, and that any differences in operator performance are simply aleatory (i.e., random). While this assumption generally holds true when performing routine actions, variability in operator response has been observed in multiple studies, especially in complex situations that go beyond training and procedures. As such, complexity can lead to differences in operator performance (e.g., operator understanding and decision-making). Furthermore, psychological research has shown that there are a number of known antecedents (i.e., attributable causes) that consistently contribute to observable and systematically measurable (i.e., not random) differences in behavior. This paper reviews examples of individual differences taken from operational experience and the psychological literature. The impact of these differences in human behavior and their implications for HRA are then discussed. We propose that individual differences should not be treated as aleatory, but rather as epistemic. Ultimately, by understanding the sources of individual differences, it is possible to remove some epistemic uncertainty from analyses.

Jeffrey C. Joe; Ronald L. Boring

2014-06-01T23:59:59.000Z

164

Operational experience with superconducting synchrotron magnets  

SciTech Connect (OSTI)

The operational experience with the Fermilab Tevatron is presented, with emphasis on reliability and failure modes. Comprisons are made between the operating efficiencies for the superconducting machine and for he conventional Main Ring.

Martin, P.S.

1987-03-01T23:59:59.000Z

165

Photovoltaics performance and reliability workshop  

SciTech Connect (OSTI)

This document consists of papers and viewgraphs compiled from the proceedings of a workshop held in September 1992. This workshop was the fifth in a series sponsored by NREL/DOE under the general subject areas of photovoltaic module testing and reliability. PV manufacturers, DOE laboratories, electric utilities and others exchanged technical knowledge and field experience. The topics of cell and module characterization, module and system performance, materials and module durability/reliability research, solar radiation, and applications are discussed.

Mrig, L. [ed.] [ed.

1992-11-01T23:59:59.000Z

166

Photovoltaics performance and reliability workshop  

SciTech Connect (OSTI)

This document consists of papers and viewgraphs compiled from the proceedings of a workshop held in September 1992. This workshop was the fifth in a series sponsored by NREL/DOE under the general subject areas of photovoltaic module testing and reliability. PV manufacturers, DOE laboratories, electric utilities and others exchanged technical knowledge and field experience. The topics of cell and module characterization, module and system performance, materials and module durability/reliability research, solar radiation, and applications are discussed.

Mrig, L. (ed.) [ed.

1992-01-01T23:59:59.000Z

167

JRF (Quality, Reliability and Operations Research): 2013 INDIAN STATISTICAL INSTITUTE  

E-Print Network [OSTI]

Research, (E) Quality Management and Systems and (F) Mathematics. A broad coverage for each of the above), Queuing theory (M/M/s), Game theory (two person zero-sum game). E. Quality Management and Systems: Quality, Quality planning, Quality costs, Total qual- ity management, Six sigma, Quality management system concepts

Bandyopadhyay, Antar

168

Advancing Visibility of Grid Operations to Improve Reliability | Department  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustionImprovement3-- ------------------------------ChapterJuly 20142Lora Toyof Energy Visibility

169

Data Center Efficiency and IT Equipment Reliability at Wider Operating  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeat Pump Models | Department1 Prepared by:DTE Energy VideoDark Matter andTemperature

170

Washington DC Reliability Requirements and the Need to Operate Mirant's  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector GeneralDepartment of EnergyofProject is onModeling andReportandVDepartmentWarmWashPotomac River

171

Fundamental mechanisms of micromachine reliability  

SciTech Connect (OSTI)

Due to extreme surface to volume ratios, adhesion and friction are critical properties for reliability of Microelectromechanical Systems (MEMS), but are not well understood. In this LDRD the authors established test structures, metrology and numerical modeling to conduct studies on adhesion and friction in MEMS. They then concentrated on measuring the effect of environment on MEMS adhesion. Polycrystalline silicon (polysilicon) is the primary material of interest in MEMS because of its integrated circuit process compatibility, low stress, high strength and conformal deposition nature. A plethora of useful micromachined device concepts have been demonstrated using Sandia National Laboratories' sophisticated in-house capabilities. One drawback to polysilicon is that in air the surface oxidizes, is high energy and is hydrophilic (i.e., it wets easily). This can lead to catastrophic failure because surface forces can cause MEMS parts that are brought into contact to adhere rather than perform their intended function. A fundamental concern is how environmental constituents such as water will affect adhesion energies in MEMS. The authors first demonstrated an accurate method to measure adhesion as reported in Chapter 1. In Chapter 2 through 5, they then studied the effect of water on adhesion depending on the surface condition (hydrophilic or hydrophobic). As described in Chapter 2, they find that adhesion energy of hydrophilic MEMS surfaces is high and increases exponentially with relative humidity (RH). Surface roughness is the controlling mechanism for this relationship. Adhesion can be reduced by several orders of magnitude by silane coupling agents applied via solution processing. They decrease the surface energy and render the surface hydrophobic (i.e. does not wet easily). However, only a molecular monolayer coats the surface. In Chapters 3-5 the authors map out the extent to which the monolayer reduces adhesion versus RH. They find that adhesion is independent of RH up to a threshold value, depending on the coating chemistry. The mechanism for the adhesion increase beyond this threshold value is that the coupling agent reconfigures from a surface to a bulk phase (Chapter 3). To investigate the details of how the adhesion increase occurs, the authors developed the mechanics for adhesion hysteresis measurements. These revealed that near-crack tip compression is the underlying cause of the adhesion increase (Chapter 4). A vacuum deposition chamber for silane coupling agent deposition was constructed. Results indicate that vapor deposited coatings are less susceptible to degradation at high RH (Chapter 5). To address issues relating to surfaces in relative motion, a new test structure to measure friction was developed. In contrast to other surface micromachined friction test structures, uniform apparent pressure is applied in the frictional contact zone (Chapter 6). The test structure will enable friction studies over a large pressure and dynamic range. In this LDRD project, the authors established an infrastructure for MEMS adhesion and friction metrology. They then characterized in detail the performance of hydrophilic and hydrophobic films under humid conditions, and determined mechanisms which limit this performance. These studies contribute to a fundamental understanding for MEMS reliability design rules. They also provide valuable data for MEMS packaging requirements.

DE BOER,MAARTEN P.; SNIEGOWSKI,JEFFRY J.; KNAPP,JAMES A.; REDMOND,JAMES M.; MICHALSKE,TERRY A.; MAYER,THOMAS K.

2000-01-01T23:59:59.000Z

172

Reliability Assessment Using Discriminative Sampling and Metamodeling  

E-Print Network [OSTI]

1 05M-400 Reliability Assessment Using Discriminative Sampling and Metamodeling G. Gary Wang Dept ABSTRACT Reliability assessment is the foundation for reliability engineering and reliability-based design optimization. It has been a difficult task, however, to perform both accurate and efficient reliability

Wang, Gaofeng Gary

173

MEMS Reliability: Infrastructure, Test Structures, Experiments, and Failure Modes  

SciTech Connect (OSTI)

The burgeoning new technology of Micro-Electro-Mechanical Systems (MEMS) shows great promise in the weapons arena. We can now conceive of micro-gyros, micro-surety systems, and micro-navigators that are extremely small and inexpensive. Do we want to use this new technology in critical applications such as nuclear weapons? This question drove us to understand the reliability and failure mechanisms of silicon surface-micromachined MEMS. Development of a testing infrastructure was a crucial step to perform reliability experiments on MEMS devices and will be reported here. In addition, reliability test structures have been designed and characterized. Many experiments were performed to investigate failure modes and specifically those in different environments (humidity, temperature, shock, vibration, and storage). A predictive reliability model for wear of rubbing surfaces in microengines was developed. The root causes of failure for operating and non-operating MEMS are discussed. The major failure mechanism for operating MEMS was wear of the polysilicon rubbing surfaces. Reliability design rules for future MEMS devices are established.

TANNER,DANELLE M.; SMITH,NORMAN F.; IRWIN,LLOYD W.; EATON,WILLIAM P.; HELGESEN,KAREN SUE; CLEMENT,J. JOSEPH; MILLER,WILLIAM M.; MILLER,SAMUEL L.; DUGGER,MICHAEL T.; WALRAVEN,JEREMY A.; PETERSON,KENNETH A.

2000-01-01T23:59:59.000Z

174

FFTF (Fast Flux Test Facility) reactor shutdown system reliability reevaluation  

SciTech Connect (OSTI)

The reliability analysis of the Fast Flux Test Facility reactor shutdown system was reevaluated. Failure information based on five years of plant operating experience was used to verify original reliability numbers or to establish new ones. Also, system modifications made subsequent to performance of the original analysis were incorporated into the reevaluation. Reliability calculations and sensitivity analyses were performed using a commercially available spreadsheet on a personal computer. The spreadsheet was configured so that future failures could be tracked and compared with expected failures. A number of recommendations resulted from the reevaluation including both increased and decreased surveillance intervals. All recommendations were based on meeting or exceeding existing reliability goals. Considerable cost savings will be incurred upon implementation of the recommendations.

Pierce, B.F.

1986-07-01T23:59:59.000Z

175

Assessing reliability in energy supply systems  

E-Print Network [OSTI]

R.N. , 1984. Power-system reliability in perspective, in:L. (Eds. ), 1991. Applied Reliability Assessment in ElectricR. , Allan, R.N. , 1996. Reliability Evaluation of Power

McCarthy, Ryan W.; Ogden, Joan M.; Sperling, Daniel

2007-01-01T23:59:59.000Z

176

Assessing Reliability in Energy Supply Systems  

E-Print Network [OSTI]

R.N. , 1984. Power-system reliability in perspective, in:L. (Eds. ), 1991. Applied Reliability Assessment in ElectricR. , Allan, R.N. , 1996. Reliability Evaluation of Power

McCarthy, Ryan; Ogden, Joan M.; Sperling, Dan

2008-01-01T23:59:59.000Z

177

Arnold Schwarzenegger REAL-TIME GRID RELIABILITY  

E-Print Network [OSTI]

Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT California ISO Real Laboratory Consortium for Electric Reliability Technology Solutions APPENDIXC October 2008 CEC-500 (VSA) prototype to monitor system voltage conditions and provide real time dispatchers with reliability

178

Constructing Reliable Distributed Communication Systems with CORBA  

E-Print Network [OSTI]

Constructing Reliable Distributed Communication Systems with CORBA Silvano Maffeis Douglas C model to support reliable data- and process- oriented distributed systems that communicate through syn distributed object computing systems with CORBA. First, we examine the question of whether reliable applica

Schmidt, Douglas C.

179

Recommendations to Address Power Reliability Concerns Raised...  

Broader source: Energy.gov (indexed) [DOE]

to Address Power Reliability Concerns Raised as a Result of Pending Environmental Regulations for Electric Generation Stations Recommendations to Address Power Reliability Concerns...

180

Comments of North American Electric Reliability Corporation ...  

Broader source: Energy.gov (indexed) [DOE]

North American Electric Reliability Corporation (NERC) to DOE Smart Grid RFI: Addressing Policy and Logistical Challenges Comments of North American Electric Reliability...

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

NREL Publishes Gearbox Reliability Collaborative Findings Report...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

NREL Publishes Gearbox Reliability Collaborative Findings Report NREL Publishes Gearbox Reliability Collaborative Findings Report October 3, 2011 - 12:56pm Addthis This is an...

182

Sandia National Laboratories: Third Annual Continuous Reliability...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ClimateECEnergyThird Annual Continuous Reliability Enhancement for Wind (CREW) Database Report Now Available Third Annual Continuous Reliability Enhancement for Wind (CREW)...

183

Funding Opportunity Announcement: PHYSICS OF RELIABILITY: EVALUATING...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

PHYSICS OF RELIABILITY: EVALUATING DESIGN INSIGHTS FOR COMPONENT TECHNOLOGIES IN SOLAR 2 (PREDICTS 2) Funding Opportunity Announcement: PHYSICS OF RELIABILITY: EVALUATING DESIGN...

184

Smart Grid Investments Improve Grid Reliability, Resilience,...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Investments Improve Grid Reliability, Resilience, and Storm Responses (November 2014) Smart Grid Investments Improve Grid Reliability, Resilience, and Storm Responses (November...

185

Sandia National Laboratories: Continuous Reliability Enhancement...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

StandardsContinuous Reliability Enhancement for Wind (CREW) Database and Analysis Program Continuous Reliability Enhancement for Wind (CREW) Database and Analysis Program 2013 CREW...

186

Information Concerning Reliability Impacts under Various System...  

Broader source: Energy.gov (indexed) [DOE]

Concerning Reliability Impacts under Various System Configurations of the Mirant Potomac River Plant Information Concerning Reliability Impacts under Various System Configurations...

187

Thermoelectric Materials By Design: Mechanical Reliability (Agreement...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

By Design: Mechanical Reliability (Agreement 14957) Thermoelectric Materials By Design: Mechanical Reliability (Agreement 14957) Presentation from the U.S. DOE Office of Vehicle...

188

Electricity Delivery and Energy Reliability PROGRAM DESCRIPTION  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

32 Electricity Delivery and Energy Reliability PROGRAM DESCRIPTION The Office of Electricity Delivery and Energy Reliability (OE) leads national efforts to modernize the electric...

189

Electricity & Energy Reliability (WFP) | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Electricity & Energy Reliability (WFP) Electricity & Energy Reliability (WFP) The purpose of the workforce Plan is to provide focus and direction to Human Resources (HR) strategy....

190

Toward Reliable and Efficient Reporting in Wireless Sensor Networks  

E-Print Network [OSTI]

Bouabdallah, and Raouf Boutaba, Senior Member, IEEE Abstract--Energy efficiency is one of the major concerns and as the first main contribution, we derive the optimal number of reporting nodes Nopt energy that minimizes the energy consumed to report reliably the occurrence of an event. In other words, we prove that limiting

Boutaba, Raouf

191

Thermal Reliability Study of Bypass Diodes in Photovoltaic Modules (Poster)  

SciTech Connect (OSTI)

This paper presents the result of high-temperature durability and thermal cycling testing and analysis for the selected diodes to study the detail of the thermal design and relative long-term reliability of the bypass diodes used to limit the detrimental effects of module hot-spot susceptibility.

Zhang, Z.; Wohlgemuth, J.; Kurtz, S.

2013-05-01T23:59:59.000Z

192

RF-MEMS capacitive switches with high reliability  

DOE Patents [OSTI]

A reliable long life RF-MEMS capacitive switch is provided with a dielectric layer comprising a "fast discharge diamond dielectric layer" and enabling rapid switch recovery, dielectric layer charging and discharging that is efficient and effective to enable RF-MEMS switch operation to greater than or equal to 100 billion cycles.

Goldsmith, Charles L.; Auciello, Orlando H.; Carlisle, John A.; Sampath, Suresh; Sumant, Anirudha V.; Carpick, Robert W.; Hwang, James; Mancini, Derrick C.; Gudeman, Chris

2013-09-03T23:59:59.000Z

193

On the Reliability of the Autosub Autonomous Underwater Vehicle  

E-Print Network [OSTI]

entered the design process The design philosophy for Autosub was based firmly on risk reduction. Indeed with reliability in mind and how operational practice complements that design philosophy. Section 3 identifies, the first phase of the project in 1989 comprised 26 work packages that assessed the feasibility and risks

Griffiths, Gwyn

194

Reliability Driven Task Scheduling for Heterogeneous Systems Yi He, Zili Shao, Bin Xiao, Qingfeng Zhuge, Edwin Sha  

E-Print Network [OSTI]

Reliability Driven Task Scheduling for Heterogeneous Systems Yi He, Zili Shao, Bin Xiao, Qingfeng plant safe operations, etc., an important research problem is how to maximize system reliability while the heterogeneity of a system and satisfy both the reliability requirement and the given time constraint

Sha, Edwin

195

TRAVEL DEMAND AND RELIABLE FORECASTS  

E-Print Network [OSTI]

TRAVEL DEMAND AND RELIABLE FORECASTS FOR TRANSIT MARK FILIPI, AICP PTP 23rd Annual Transportation transportation projects § Develop and maintain Regional Travel Demand Model § Develop forecast socio in cooperative review during all phases of travel demand forecasting 4 #12;Cooperative Review Should Include

Minnesota, University of

196

Ris-M-2584 RELIABILITY CALCULATIONS  

E-Print Network [OSTI]

Risø-M-2584 RELIABILITY CALCULATIONS Improvements of methods intended for calculation of reliability of structures and systems Kurt E. Petersen Abstract. Risk and reliability analysis is increasingly being used in evaluations of plant safety and plant reliability. The analysis can be performed either

197

Reliability Failure Mode, Effects, and Criticality Analysis  

E-Print Network [OSTI]

Reliability Failure Mode, Effects, and Criticality Analysis Addendum 1; HFE ~ ATM501 PAGE I I. Hiebert Reliability Engineer HFE · B-1 f #12;~~.~-~ -_ ~ ~ Reliability Failure Mode, Effects were slight adjustment in the linearizing resistors. The reliability is effected upward by the deletion

Rathbun, Julie A.

198

The design of a reliable reputation system  

E-Print Network [OSTI]

reliability by spreading its transactions evenly across all 20 peers in the system (shown by Distribution

Swamynathan, Gayatri; Almeroth, Kevin C.; Zhao, Ben Y.

2010-01-01T23:59:59.000Z

199

Vehicle to MicroGrid: Leveraging Existing Assets for Reliable Energy Management Mike Simpson, Tony Markel, and Michael O'Keefe  

E-Print Network [OSTI]

Vehicle to MicroGrid: Leveraging Existing Assets for Reliable Energy Management Mike Simpson, Tony Electricity GCV MicroGrid The Smith Electric Newton allelectric truckFort Carson Photovoltaic Installation ENERGY MANAGEMENT BUILDING ENERGY MANAGEMENT GRID OPERATION & RELIABILITY GRID OPERATION & RELIABILITY

200

Using wind plant data to increase reliability.  

SciTech Connect (OSTI)

Operators interested in improving reliability should begin with a focus on the performance of the wind plant as a whole. To then understand the factors which drive individual turbine performance, which together comprise the plant performance, it is necessary to track a number of key indicators. Analysis of these key indicators can reveal the type, frequency, and cause of failures and will also identify their contributions to overall plant performance. The ideal approach to using data to drive good decisions includes first determining which critical decisions can be based on data. When those required decisions are understood, then the analysis required to inform those decisions can be identified, and finally the data to be collected in support of those analyses can be determined. Once equipped with high-quality data and analysis capabilities, the key steps to data-based decision making for reliability improvements are to isolate possible improvements, select the improvements with largest return on investment (ROI), implement the selected improvements, and finally to track their impact.

Peters, Valerie A. (Sandia National Laboratories, Livermore, CA); Ogilvie, Alistair B.; McKenney, Bridget L.

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

NREL: Performance and Reliability R&D - Photovoltaic Reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the Contributions and AchievementsResearchReliability Workshops

202

Microworlds, Simulators, and Simulation: Framework for a Benchmark of Human Reliability Data Sources  

SciTech Connect (OSTI)

In this paper, we propose a method to improve the data basis of human reliability analysis (HRA) by extending the data sources used to inform HRA methods. Currently, most HRA methods are based on limited empirical data, and efforts to enhance the empirical basis behind HRA methods have not yet yielded significant new data. Part of the reason behind this shortage of quality data is attributable to the data sources used. Data have been derived from unrelated industries, from infrequent risk-significant events, or from costly control room simulator studies. We propose a benchmark of four data sources: a simplified microworld simulator using unskilled student operators, a full-scope control room simulator using skilled student operators, a full-scope control room simulator using licensed commercial operators, and a human performance modeling and simulation system using virtual operators. The goal of this research is to compare findings across the data sources to determine to what extent data may be used and generalized from cost effective sources.

Ronald Boring; Dana Kelly; Carol Smidts; Ali Mosleh; Brian Dyre

2012-06-01T23:59:59.000Z

203

Reliability and Maintainability Issues for the Next Linear Collider  

SciTech Connect (OSTI)

Large accelerators for high energy physics research traditionally have been designed using informal best design, engineering, and management practices to achieve acceptable levels of operational availability. However, the Next Linear Collider(NLC) project presents a particular challenge for operational availability due to the unprecedented size and complexity of the accelerator systems required to achieve the physics goals of high center-of-mass energy and high luminosity. Formal reliability and maintainability analysis, design, and implementation will be required to achieve acceptable operational availability for the high energy physics research program. This paper introduces some of the basic concepts of reliability analysis and applies them to the 2.6-cm microwave power system of the two 10-km-long, 250-GeV linacs that are currently proposed for the NLC design.

Wilson, Zane J.; Gold, Saul L.; Koontz, Ron F.; Lavine, Ted L.; /SLAC

2011-08-26T23:59:59.000Z

204

Radioisotope thermoelectric generator reliability and safety  

SciTech Connect (OSTI)

There are numerous occasions when a planetary mission requires energy in remote areas of the solar system. Anytime power is required much beyond Mars or the Asteroid Belts, solar power is not an option. The radioisotope thermoelectric generator (RTG) was developed for such a mission requirement. It is a relatively small and lightweight power source that can produce power under adverse conditions. Just this type of source has become the backbone of the power system for far outer plant exploration. Voyagers I and II are utilizing RTGs, which will soon power the Galileo spacecraft to Jupiter and the Ulysses spacecraft to study the solar poles. The paper discusses RTG operation including thermoelectric design, converter design, general-purpose heat source; RTG reliability including design, testing, experience, and launch approval; and RTG safety issues and methods of ensuring safety.

Campbell, R.; Klein, J.

1989-01-01T23:59:59.000Z

205

Full-scale tests help improve reliability of DST tools  

SciTech Connect (OSTI)

A joint-industry project set up procedures and full scale tests to determine the reliability and integrity of drill stem test (DST) tools for use in difficult high pressure, high temperature wells. These DST tool tests helped determine changes needed to address reliability in high pressure, high temperature (HPHT) conditions and has demonstrated that DST tools could maintain integrity in this type of environment. Eleven major operators and service/testing companies in the Norway/U.K. area undertook a joint industry study to address these problems and to determine methods to increase the reliability of DST operations in HPHT well testing. Emphasis was placed on the selection of the downhole equipment used for the HPHT drill stem tests and design of the full scale testing of the North-Sea-area field tools in use. Additionally, an investigation was to be made to establish methods that could be used to verify and increase equipment reliability. The project also included design parameters for contingency conditions that were not normally present during equipment operations but could exist in emergency situations. Eleven tools, including tester valves, multiple-cycle circulating valves, bypass valves, and safety/circulating valves, from different service company/suppliers were rigorously tested. The paper describes the project, the tools tested, test methods, and results.

Ringgenberg, P. [Halliburton Energy Services, Dallas, TX (United States); Self, J.C. [Statoil, Stavanger (Norway)

1996-08-05T23:59:59.000Z

206

Human Reliability Analysis for Digital Human-Machine Interfaces  

SciTech Connect (OSTI)

This paper addresses the fact that existing human reliability analysis (HRA) methods do not provide guidance on digital human-machine interfaces (HMIs). Digital HMIs are becoming ubiquitous in nuclear power operations, whether through control room modernization or new-build control rooms. Legacy analog technologies like instrumentation and control (I&C) systems are costly to support, and vendors no longer develop or support analog technology, which is considered technologically obsolete. Yet, despite the inevitability of digital HMI, no current HRA method provides guidance on how to treat human reliability considerations for digital technologies.

Ronald L. Boring

2014-06-01T23:59:59.000Z

207

Human Reliability Analysis for Small Modular Reactors  

SciTech Connect (OSTI)

Because no human reliability analysis (HRA) method was specifically developed for small modular reactors (SMRs), the application of any current HRA method to SMRs represents tradeoffs. A first- generation HRA method like THERP provides clearly defined activity types, but these activity types do not map to the human-system interface or concept of operations confronting SMR operators. A second- generation HRA method like ATHEANA is flexible enough to be used for SMR applications, but there is currently insufficient guidance for the analyst, requiring considerably more first-of-a-kind analyses and extensive SMR expertise in order to complete a quality HRA. Although no current HRA method is optimized to SMRs, it is possible to use existing HRA methods to identify errors, incorporate them as human failure events in the probabilistic risk assessment (PRA), and quantify them. In this paper, we provided preliminary guidance to assist the human reliability analyst and reviewer in understanding how to apply current HRA methods to the domain of SMRs. While it is possible to perform a satisfactory HRA using existing HRA methods, ultimately it is desirable to formally incorporate SMR considerations into the methods. This may require the development of new HRA methods. More practicably, existing methods need to be adapted to incorporate SMRs. Such adaptations may take the form of guidance on the complex mapping between conventional light water reactors and small modular reactors. While many behaviors and activities are shared between current plants and SMRs, the methods must adapt if they are to perform a valid and accurate analysis of plant personnel performance in SMRs.

Ronald L. Boring; David I. Gertman

2012-06-01T23:59:59.000Z

208

Gearbox Reliability Collaborative Bearing Calibration  

SciTech Connect (OSTI)

NREL has initiated the Gearbox Reliability Collaborative (GRC) to investigate the root cause of the low wind turbine gearbox reliability. The GRC follows a multi-pronged approach based on a collaborative of manufacturers, owners, researchers and consultants. The project combines analysis, field testing, dynamometer testing, condition monitoring, and the development and population of a gearbox failure database. At the core of the project are two 750kW gearboxes that have been redesigned and rebuilt so that they are representative of the multi-megawatt gearbox topology currently used in the industry. These gearboxes are heavily instrumented and are tested in the field and on the dynamometer. This report discusses the bearing calibrations of the gearboxes.

van Dam, J.

2011-10-01T23:59:59.000Z

209

ERTP: Energy-Efficient and Reliable Transport Protocol for Data Streaming in Wireless Sensor  

E-Print Network [OSTI]

ERTP: Energy-Efficient and Reliable Transport Protocol for Data Streaming in Wireless Sensor applications in Wireless Sensor Networks require re- liable and energy-efficient transport protocols [17] [18 of minutes or hours), energy-efficiency is. Long-term operation and reliable delivery of the sensed data

New South Wales, University of

210

Service reliability measurement framework using smart card data : application to the London Underground  

E-Print Network [OSTI]

Service reliability is an important dimension of performance to transit passengers, affecting not only their perceptions of service quality, but their travel behaviour as well. The ability of transit operators to understand ...

Uniman, David Louis

2009-01-01T23:59:59.000Z

211

Infrared limit in external field scattering  

E-Print Network [OSTI]

Scattering of electrons/positrons by external classical electromagnetic wave packet is considered in infrared limit. In this limit the scattering operator exists and produces physical effects, although the scattering cross-section is trivial.

Andrzej Herdegen

2012-05-17T23:59:59.000Z

212

Optimal Technology Selection and Operation of Microgrids in Commercial Buildings  

E-Print Network [OSTI]

L ABORATORY Optimal Technology Selection and Operation ofEnvironmental Energy Technologies Division 15 January 2007for Electric Reliability Technology Solutions with funding

Marnay, Chris; Venkataramanan, Giri; Stadler, Michael; Siddiqui, Afzal; Firestone, Ryan; Chandran, Bala

2008-01-01T23:59:59.000Z

213

The Materials Reliability Division has established several capabilities for analyzing the reliability of  

E-Print Network [OSTI]

The Materials Reliability Division has established several capabilities for analyzing the reliability of small scale structures, including a number of custom instruments developed specifically@boulder.nist.gov FACILITIES Measurement Facilities: Small-Scale Mechanical Reliability Materials Science and Engineering

214

Microgrids and Heterogeneous Security, Quality, Reliability, and Availability  

E-Print Network [OSTI]

and Energy Reliability, Distribution System Integrationand Energy Reliability, Distribution System Integration

Marnay, Chris

2007-01-01T23:59:59.000Z

215

A Control Scheme of Enhanced Reliability for Multiple Chiller Plants Using Mergerd Building Cooling Load Measurements  

E-Print Network [OSTI]

of the Eighth International Conference for Enhanced Building Operations, Berlin, Germany, October 20-22, 2008 much on the accuracy of the chiller model. Measurement accuracy and reliability are essential for the accuracy and reliability of chiller sequencing... Central Chilling Plant Monitoring and control Figure 1. Framework of enhancing building cooling load measurements using data fusion 2 ESL-IC-08-10-31 Proceedings of the Eighth International Conference for Enhanced Building Operations, Berlin, Germany...

Wang, S.; Sun, Y.; Huang, G.; Zhu, N.

216

Sandia National Laboratories: Inverter Reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLS Exhibit atVehicleEnergyPolydotsMicroReliability 2013

217

Reliability Challenges for Solar Energy (Presentation)  

SciTech Connect (OSTI)

Presentation that reviews reliability issues related to various types of photovoltaic tecnnologies, including crystalline silicon, thin films, and concentrating PV.

Kurtz, S.

2009-12-08T23:59:59.000Z

218

LUNAR MASS SPECTROMETER RELIABILITY LOGIC DIAGRAM  

E-Print Network [OSTI]

point (A) to (F). The block diagram also defines the reliability functions for the purpose of FMEA 1

Rathbun, Julie A.

219

Operations and compositions in transrecursive operators  

SciTech Connect (OSTI)

The present study is a continuation of a study focusing on introduction and analysis of operations on transrecursive operators, which are similar to the operators considered in the theory of algorithms. Such operations may be standard product of algorithms) or special ({alpha}-disjunction and {alpha}-iteration. In some respects, these operations in the class of transrecursive operators are similar to their traditional analogs. In other respects, however, they are essentially different. For instance, they may have different types and modes. Specific features of operations on transrecursive operators are attributable to explicit omission of some restrictions on their construction compared with the construction of algorithms. The standard approaches to mathematical modeling of the concept of algorithm assume a number of essential restrictions. Specifically, they assume finiteness of (1) the input data arriving during a finite time interval; (2) the list of rules underlying the operations of the algorithm; (3) the transformations executed by a single operation; (4) the description of each rule; (5) the time to execute one operation; (6) the time to execute one operation; (7) the number of cycles that the algorithm executes in order to realize the mapping. In application to Turing machines, these restrictions imply finiteness of the initial word, finiteness of the command table of the read head, and ultimate stopping when the result is obtained after finitely many steps. Various classes of transrecursive operators are constructed by dropping various combinations of the {open_quotes}finiteness{close_quotes} restrictions. Two classes of transrecursive operators - the limit (inductive) Turing machines and transalgorithms - have been obtained by dropping respectively the assumption of finiteness of the number of execution cycles and the assumption of finiteness of the list of rules.

Burgin, M.S.; Borodyanskii, Yu.M.

1995-03-01T23:59:59.000Z

220

Statistical Modeling of Photovoltaic Reliability Using Accelerated Degradation Techniques (Poster)  

SciTech Connect (OSTI)

We introduce a cutting-edge life-testing technique, accelerated degradation testing (ADT), for PV reliability testing. The ADT technique is a cost-effective and flexible reliability testing method with multiple (MADT) and Step-Stress (SSADT) variants. In an environment with limited resources, including equipment (chambers), test units, and testing time, these techniques can provide statistically rigorous prediction of lifetime and other interesting parameters, such as failure rate, warranty time, mean time to failure, degradation rate, activation energy, acceleration factor, and upper limit level of stress. J-V characterization can be used for degradation data and the generalized Eyring model can be used for the thermal-humidity stress condition. The SSADT model can be constructed based on the cumulative damage model (CEM), which assumes that the remaining test united are failed according to cumulative density function of current stress level regardless of the history on previous stress levels.

Lee, J.; Elmore, R.; Jones, W.

2011-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

SOFTWARE RELIABILITY SIMULATION Robert C. Tausworthe  

E-Print Network [OSTI]

CHAPTER 16 SOFTWARE RELIABILITY SIMULATION Robert C. Tausworthe Jet Propulsion Laboratory, together with their attributes and interrelationships, that are related to reliability 1 comprise what we here refer to as the reliability process. The artifacts of the software life cycle include doc­ uments

Lyu, Michael R.

222

Arnold Schwarzenegger REAL-TIME GRID RELIABILITY  

E-Print Network [OSTI]

Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT Scoping Study Report Reliability Technology Solutions APPENDIXG October 2008 CEC-500-2008-049-APG #12;#12;Prepared By: Lawrence for Electric Reliability Technology Solutions and was funded by the California Energy Commission's Public

223

Network Reliability: Models, Measures and Analysis  

E-Print Network [OSTI]

Network Reliability: Models, Measures and Analysis #3; L.Jereb Department of Telecommunications y quality services when the network elements apt to random failures. Several network reliability models have of network reliability analysis and summarizes the critical issues. A possible solution taking into account

László, Jereb

224

RELIABILITY-BASED CASTING PROCESS DESIGN OPTIMIZATION  

E-Print Network [OSTI]

RELIABILITY-BASED CASTING PROCESS DESIGN OPTIMIZATION Richard Hardin1 , K.K. Choi1 , and Christoph 52242-1527 Keywords: Casting Process Design, Optimization, Reliability-Based Design Optimization purpose reliability-based design optimization (RBDO) software tool previously developed at the University

Beckermann, Christoph

225

Reliability Prediction -Array D Redundant Command Receiver  

E-Print Network [OSTI]

Reliability Prediction - Array D Redundant Command Receiver ATM 981 I PAGI 1 OP 16 DATE 26 Feb. 1971 This Reliability Prediction was prepared by Motorola's Government Electronics Division as required combiner· .. There was a reliability design goal of · 998 for a two-year mission on the ... lunar surface

Rathbun, Julie A.

226

Arnold Schwarzenegger REAL-TIME GRID RELIABILITY  

E-Print Network [OSTI]

Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT Prototype Phasor-Based Real Reliability Technology Solutions APPENDIXE October 2008 CEC-500-2008-049-APE #12;#12;Prepared By: Lawrence in this report. #12;Slide 0 Consortium for Electric Reliability Technology Solutions Real-Time Dynamics

227

Reliability Analysis of Microelectronic Components and Materials  

E-Print Network [OSTI]

1 Reliability Analysis of Microelectronic Components and Materials Increasing numbers of the degradation processes relevant to soldered joints is crucial for more reliable life-cycle predictions. Joining methods are critical for the reliable use of electronic packages. In particular, since the advent

Berlin,Technische Universität

228

Transductive Reliability Estimation for Kernel Based Classifiers  

E-Print Network [OSTI]

Transductive Reliability Estimation for Kernel Based Classifiers Dimitris Tzikas1 , Matjaz Kukar2@cs.uoi.gr Abstract. Estimating the reliability of individual classifications is very important in several applications such as medical diagnosis. Recently, the transductive approach to reliability estimation has been

Likas, Aristidis

229

Reliability Meets Big Data: Opportunities and Challenges  

E-Print Network [OSTI]

Reliability Meets Big Data: Opportunities and Challenges William Q. Meeker Department of Statistics, 2013 Abstract Reliability field data such as that obtained from warranty claims and maintenance records products, the nature of field reliability data is changing dramatically. In particular, products can

230

Arnold Schwarzenegger REAL-TIME GRID RELIABILITY  

E-Print Network [OSTI]

Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT Prototype Phasor-Based Real Research Program Prepared By: Lawrence Berkeley National Laboratory Consortium for Electric Reliability in this report. #12;#12;USER GUIDE Version 3 August 2005 Prepared by: for Consortium for Electric Reliability

231

RELIABILITY IN PERSONAL POSITIONING Heidi Kuusniemi1*  

E-Print Network [OSTI]

RELIABILITY IN PERSONAL POSITIONING Heidi Kuusniemi1* , Gérard Lachapelle2 , Jarmo Takala1 1 interference effects lead to measurement errors, and reliability monitoring in terms of proper fault detection in future new possibilities to provide integrity and reliability information to the user both at signal

Calgary, University of

232

RELIABILITY ENGINEERING: OLD PROBLEMS AND NEW CHALLENGES  

E-Print Network [OSTI]

1 RELIABILITY ENGINEERING: OLD PROBLEMS AND NEW CHALLENGES E. Zio Dept. of Energy, Polytechnic: enrico.zio@polimi.it Abstract The first recorded usage of the word reliability dates back to the 1800s, albeit referred to a person and not a technical system. Since then, the concept of reliability has become

Paris-Sud XI, Université de

233

Reliability modeling and evaluation of HVDC power transmission systems  

SciTech Connect (OSTI)

The objective of this paper is to present an improved computational method for evaluating the reliability indices of HVdc transmission systems. The developed models and computational techniques are described. These can be used to simulate the operational practices and characteristics of a system under study efficiently and realistically. This method is based on the failure modes and effects analysis and uses the event tree method and the minimal cut set approach to represent the system's operational behavior and deduce the appropriate system's failure modes. A set of five reliability indices is evaluated for each output node being analyzed together with the probability and frequency of encountering particular regions of system performance levels. The analysis of an assumed HVdc bipolar transmission system is also included.

Dialynas, E.N.; Koskolos, N.C. (National Technical Univ., Athens (Greece). Dept. of Electrical and Computer Engineering)

1994-04-01T23:59:59.000Z

234

Probabilistic fatigue methodology and wind turbine reliability  

SciTech Connect (OSTI)

Wind turbines subjected to highly irregular loadings due to wind, gravity, and gyroscopic effects are especially vulnerable to fatigue damage. The objective of this study is to develop and illustrate methods for the probabilistic analysis and design of fatigue-sensitive wind turbine components. A computer program (CYCLES) that estimates fatigue reliability of structural and mechanical components has been developed. A FORM/SORM analysis is used to compute failure probabilities and importance factors of the random variables. The limit state equation includes uncertainty in environmental loading, gross structural response, and local fatigue properties. Several techniques are shown to better study fatigue loads data. Common one-parameter models, such as the Rayleigh and exponential models are shown to produce dramatically different estimates of load distributions and fatigue damage. Improved fits may be achieved with the two-parameter Weibull model. High b values require better modeling of relatively large stress ranges; this is effectively done by matching at least two moments (Weibull) and better by matching still higher moments. For this purpose, a new, four-moment {open_quotes}generalized Weibull{close_quotes} model is introduced. Load and resistance factor design (LRFD) methodology for design against fatigue is proposed and demonstrated using data from two horizontal-axis wind turbines. To estimate fatigue damage, wind turbine blade loads have been represented by their first three statistical moments across a range of wind conditions. Based on the moments {mu}{sub 1}{hor_ellipsis}{mu}{sub 3}, new {open_quotes}quadratic Weibull{close_quotes} load distribution models are introduced. The fatigue reliability is found to be notably affected by the choice of load distribution model.

Lange, C.H. [Stanford Univ., CA (United States)

1996-05-01T23:59:59.000Z

235

Review of Quantitative Software Reliability Methods  

SciTech Connect (OSTI)

The current U.S. Nuclear Regulatory Commission (NRC) licensing process for digital systems rests on deterministic engineering criteria. In its 1995 probabilistic risk assessment (PRA) policy statement, the Commission encouraged the use of PRA technology in all regulatory matters to the extent supported by the state-of-the-art in PRA methods and data. Although many activities have been completed in the area of risk-informed regulation, the risk-informed analysis process for digital systems has not yet been satisfactorily developed. Since digital instrumentation and control (I&C) systems are expected to play an increasingly important role in nuclear power plant (NPP) safety, the NRC established a digital system research plan that defines a coherent set of research programs to support its regulatory needs. One of the research programs included in the NRC's digital system research plan addresses risk assessment methods and data for digital systems. Digital I&C systems have some unique characteristics, such as using software, and may have different failure causes and/or modes than analog I&C systems; hence, their incorporation into NPP PRAs entails special challenges. The objective of the NRC's digital system risk research is to identify and develop methods, analytical tools, and regulatory guidance for (1) including models of digital systems into NPP PRAs, and (2) using information on the risks of digital systems to support the NRC's risk-informed licensing and oversight activities. For several years, Brookhaven National Laboratory (BNL) has worked on NRC projects to investigate methods and tools for the probabilistic modeling of digital systems, as documented mainly in NUREG/CR-6962 and NUREG/CR-6997. However, the scope of this research principally focused on hardware failures, with limited reviews of software failure experience and software reliability methods. NRC also sponsored research at the Ohio State University investigating the modeling of digital systems using dynamic PRA methods. These efforts, documented in NUREG/CR-6901, NUREG/CR-6942, and NUREG/CR-6985, included a functional representation of the system's software but did not explicitly address failure modes caused by software defects or by inadequate design requirements. An important identified research need is to establish a commonly accepted basis for incorporating the behavior of software into digital I&C system reliability models for use in PRAs. To address this need, BNL is exploring the inclusion of software failures into the reliability models of digital I&C systems, such that their contribution to the risk of the associated NPP can be assessed.

Chu, T.L.; Yue, M.; Martinez-Guridi, M.; Lehner, J.

2010-09-17T23:59:59.000Z

236

Comparison of reliability performance of group connected and conventional HVDC transmission systems  

SciTech Connect (OSTI)

A group connected HVDC transmission scheme is a variant of the unit connection where instead of a single generator, a group of generators are directly connected to the converter. Studies conducted in the past indicated that significant cost reduction can be achieved using this scheme. This is mainly due to the elimination of many components which results in considerable capital and operating cost savings to the utility. Concerns regarding the reliability performance of unit connected schemes were raised, however, there has not been a detailed reliability study conducted. This paper addresses the reliability evaluation aspect of a group connected scheme and compares the reliability performance of the group connected scheme with that of the conventional common collector system. Reliability models for both schemes were developed using a hypothetical system model based on the Nelson River system. Practical system component outage data was used to examine the reliability performance of both schemes.

Kuruganty, S. [Univ. of North Dakota, Grand Forks, ND (United States). Dept. of Electrical Engineering] [Univ. of North Dakota, Grand Forks, ND (United States). Dept. of Electrical Engineering

1995-10-01T23:59:59.000Z

237

Energy and Reliability Considerations For Adjustable Speed Driven Pumps  

E-Print Network [OSTI]

ENERGY AND RELIABILITY CONSIDERATIONS FOR ADJUSTABLE SPEED DRIVEN PUMPS Don Casada Senior Development Associate ABSTRACT Centrifugal devices such as pumps, fans, and compressors follow a general set of speed affinity laws: Q2 = QI *( N z... there is no static head, the system head, like the pump head, is proportional to the velocity, or flow rate, squared. As a result. the pump affinity laws also indicate how the pump and system will work together to define the operating point in such a system...

Casada, D.

238

Contingency Visualization for Real-Time Decision Support in Grid Operation  

SciTech Connect (OSTI)

Contingency analysis is a key function in control centers to assess the impact of various combinations of power system component failures based on state estimates. Today's practice analyzes only a limited set of contingency cases and lacks of capabilities in presenting the results in a way that is easy to be understood by grid operators in a short time frame of seconds to minutes. This limits the ability to operate the power grid for better reliability and efficiency. Faster analysis of more cases is required to safely and reliably operate today's power grids which have a less margin and more intermittent renewable energy sources. This paper explores the advancements in high performance computing and visual analytics for improving the computational speed and the information representation in contingency analysis. A framework of advanced contingency analysis is proposed. Case studies using the Western Electricity Coordinating Council (WECC) system are presented to demonstrate the feasibility of the proposed framework. Comparative assessment by real power grid operators has been performed as part of a WECC operator training class. The assessment results demonstrate the validity of the proposed contingency analysis and visualization approach.

Huang, Zhenyu; Chen, Yousu; Greitzer, Frank L.; Eubank, Robert

2011-10-17T23:59:59.000Z

239

Method for reliability analysis of complex reactor systems. [LMFBR  

SciTech Connect (OSTI)

A method and a computer code for efficient and accurate reliability analyses of complex reactor systems are described and illustrated through an example. The method permits realistic analyses through its ability to accurately model and evaluate instantaneous and average unavailabilities for large systems with dependencies. The component models can include continuously monitored, non-repairable, and periodically tested components which are subject to failures resulting from components which are subject to failures resulting from component demands, stand-by conditions, human errors associated with testing and repair, as well as failures during actual operation. The numerical process used is efficient and allows analysis of general system configurations with arbitrary scheduling of maintenance operations.

Elerath, J.G.; Vaurio, J.K.; Wood, A.P.

1982-01-01T23:59:59.000Z

240

Can Software Reliability Outperform Hardware Reliability in High-Performance Interconnects?  

E-Print Network [OSTI]

Can Software Reliability Outperform Hardware Reliability in High-Performance Interconnects? A Case, Myrinet, InfiniBand, and others HPC networks are generally quite reliable without additional protocols link With this in mind, how should reliability be implemented? 3 #12;Onload or Offload? Some networks

Panda, Dhabaleswar K.

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Reliable computation of homogeneous azeotropes  

SciTech Connect (OSTI)

It is important to determine the existence and composition of homogeneous azeotropes in the analysis of phase behavior and in the synthesis and design of separation systems, from both theoretical and practical standpoints. A new method for reliably locating any and all homogeneous azeotropes for multicomponent mixtures is presented. The method also verifies the nonexistence of homogeneous azeotropes if none are present. The method is based on interval analysis, in particular an interval-Newton/generalized-bisection-algorithm providing a mathematical and computational guarantee that all azeotropes are located. This general-purpose technique can be applied in connection with any thermodynamic models. The technique is illustrated in several example problems using the Wilson, NRTL, and UNIQUAC activity-coefficient models.

Maier, R.W.; Brennecke, J.F.; Stadtherr, M.A. [Univ. of Notre Dame, IN (United States). Dept. of Chemical Engineering] [Univ. of Notre Dame, IN (United States). Dept. of Chemical Engineering

1998-08-01T23:59:59.000Z

242

Manufacturing Metrology for c-Si Module Reliability/Durabiltiy...  

Broader source: Energy.gov (indexed) [DOE]

Manufacturing Metrology for c-Si Module ReliabilityDurabiltiy Manufacturing Metrology for c-Si Module ReliabilityDurabiltiy Presented at the PV Module Reliability Workshop,...

243

Gearbox Reliability Collaborative Update (Presentation)  

SciTech Connect (OSTI)

Understand and isolate sources of gearbox failures; Improve understanding of internal loads and response; Normal operation and transients; Improve analysis tools to accurately simulate response; Improve ability to reproduce field response in dyno testing; Evaluate how CM augments design and O and M.

Keller, J.; McDade, M.; LaCava, W.; Guo, Y.; Sheng, S.

2012-04-01T23:59:59.000Z

244

Computational Thermochemistry and Benchmarking of Reliable Methods  

SciTech Connect (OSTI)

During the first and second years of the Computational Thermochemistry and Benchmarking of Reliable Methods project, we completed several studies using the parallel computing capabilities of the NWChem software and Molecular Science Computing Facility (MSCF), including large-scale density functional theory (DFT), second-order Moeller-Plesset (MP2) perturbation theory, and CCSD(T) calculations. During the third year, we continued to pursue the computational thermodynamic and benchmarking studies outlined in our proposal. With the issues affecting the robustness of the coupled cluster part of NWChem resolved, we pursued studies of the heats-of-formation of compounds containing 5 to 7 first- and/or second-row elements and approximately 10 to 14 hydrogens. The size of these systems, when combined with the large basis sets (cc-pVQZ and aug-cc-pVQZ) that are necessary for extrapolating to the complete basis set limit, creates a formidable computational challenge, for which NWChem on NWMPP1 is well suited.

Feller, David F.; Dixon, David A.; Dunning, Thom H.; Dupuis, Michel; McClemore, Doug; Peterson, Kirk A.; Xantheas, Sotiris S.; Bernholdt, David E.; Windus, Theresa L.; Chalasinski, Grzegorz; Fosada, Rubicelia; Olguim, Jorge; Dobbs, Kerwin D.; Frurip, Donald; Stevens, Walter J.; Rondan, Nelson; Chase, Jared M.; Nichols, Jeffrey A.

2006-06-20T23:59:59.000Z

245

High-performance, high-reliability tape storage for midrange and server-based environments  

E-Print Network [OSTI]

operations can take advan- tage of lower cost tape storage. With an industry-leading design that enables repetitive handling by automated pickers or human operators, thus protecting the tape from the physical, provide unparalleled time-to-data levels and reliability. Magstar MP Fast Access Linear Tape family

246

High temperature superconducting fault current limiter  

DOE Patents [OSTI]

A fault current limiter for an electrical circuit is disclosed. The fault current limiter includes a high temperature superconductor in the electrical circuit. The high temperature superconductor is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter. 15 figs.

Hull, J.R.

1997-02-04T23:59:59.000Z

247

Nonlinear subcritical magnetohydrodynamic beta limit  

SciTech Connect (OSTI)

Published gyrokinetic simulations have had difficulty operating beyond about half the ideal magnetohydrodynamic (MHD) critical beta limit with stationary and low transport levels in some well-established reference cases. Here it is demonstrated that this limitation is unlikely due to numerical instability, but rather appears to be a nonlinear subcritical MHD beta limit[R. E. Waltz, Phys. Rev. Lett. 55, 1098 (1985)] induced by the locally enhanced pressure gradients from the diamagnetic component of the nonlinearly driven (zero frequency) zonal flows. Strong evidence that the zonal flow corrugated pressure gradient profiles can act as a MHD-like beta limit unstable secondary equilibrium is provided. It is shown that the addition of sufficient ExB shear or operation closer to drift wave instability threshold, thereby reducing the high-n drift wave turbulence nonlinear pumping of the zonal flows, can allow the normal high-n ideal MHD beta limit to be reached with low transport levels. Example gyrokinetic simulations of experimental discharges are provided: one near the high-n beta limit reasonably matches the low transport levels needed when the high experimental level of ExB shear is applied; a second experimental example at moderately high beta appears to be limited by the subcritical beta.

Waltz, R. E. [General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)

2010-07-15T23:59:59.000Z

248

Insulator damage endangers public, power reliability; ratepayers...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Insulator-damage-endangers-public-power-reliability-ratepayers-foot-repair-bill Sign In About | Careers | Contact | Investors | bpa.gov Search News & Us Expand News & Us...

249

General Order Ensuring Reliable Electric Service (Louisiana)  

Broader source: Energy.gov [DOE]

The standards set forth herein have been developed to provide consumers, the Louisiana Public Service Commission, and jurisdictional electric utilities with a uniform method of ensuring reliable...

250

Mechanical Reliability of Piezo-Stack Actuators  

Broader source: Energy.gov (indexed) [DOE]

Review Guidelines Mechanical Reliability of Piezo-Stack Actuators (Agreement 13329) Andrew A. Wereszczak, Hong Wang, and Hua-Tay Lin Oak Ridge National Laboratory Oak Ridge, TN...

251

Improving Wind Turbine Gearbox Reliability: Preprint  

SciTech Connect (OSTI)

This paper describes a new research and development initiative to improve gearbox reliability in wind turbines begun at the National Renewable Energy Laboratory (NREL) in Golden, Colorado, USA.

Musial, W.; Butterfield, S.; McNiff, B.

2007-06-01T23:59:59.000Z

252

Improve Claus simulation by integrating kinetic limitations into equilibrium calculations  

SciTech Connect (OSTI)

Since all existing Claus simulators are based on equilibrium calculations, it is not surprising that the simulation results, including the overall sulfur yield, air to acid gas ratio, and stream compositions are somewhat different from the plant data. One method for improving the simulation is to consider the kinetic limitations in the Claus reactions. This has been accomplished in this work by integrating kinetic considerations into equilibrium calculations. Kinetic limitations have been introduced in both the Claus reaction furnace and the catalytic converters. An interactive computer program SULPLT Version 3 was written to implement the proposed modifications. The computer program was used to simulate the Claus furnace, catalytic converters, and the effect of air to acid gas ratio on sulfur recovery to check against literature data. Three Claus plants for which data exist have also been simulated. The results show that the proposed model predicts sulfur recovery, sulfur emission, optimal air to acid gas ratio, and various stream compositions more accurately than the equilibrium model. The proposed model appears to be valid, reliable, and applicable over a wide range of operating conditions (acid gas feeds ranging from 13% to 95% H/sub 2/S with different levels of impurities). The methodology developed in this study should be applicable to any reaction systems where kinetic limitations are important but where equilibrium still prevails.

Wen, T.C.

1986-01-01T23:59:59.000Z

253

Reliability Module By: Alex Miller and Mark Robinson  

E-Print Network [OSTI]

Reliability Module By: Alex Miller and Mark Robinson Material Summarized from Reliability Module://spacese.spacegrant.org/). #12;Key Concepts Understanding the importance of reliability as an engineering discipline to calculate reliability Mathematically Visually (block diagrams) Source: Exploration Systems Engineering

Rhoads, James

254

PV Performance and Reliability Validation Capabilities at Sandia...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Performance and Reliability Validation Capabilities at Sandia National Laboratories PV Performance and Reliability Validation Capabilities at Sandia National Laboratories This...

255

Switchover software reliability estimate for Paducah Freezer/Sublimer computer systems  

SciTech Connect (OSTI)

K-25 Engineering Division purchased a series of redundant computer systems and developed software for the purpose of providing continuous process monitoring and control for the Freezer/Sublimer equipment in the gaseous diffusion process at the Paducah Gaseous Diffusion Plant. The application software is loaded on two central processing units (CPU) so that in the event of a failure of the primary unit, the processing can switch to the backup unit and continue processing without error. It is the purpose of this document to demonstrate the reliability of this system with respect to its ability to switch properly between redundant CPU. The total reliability estimation problem -- which considers the computer hardware, the operating system software, and the application software -- has been reduced to one that considers only the application software directly involved in the switchover process. Estimates are provided for software reliability and the testing coverage. Software and hardware reliability models and reliability growth models are considered in addition to Bayesian approaches.

Flanagan, D.M.; Davis, J.N.

1993-04-01T23:59:59.000Z

256

Issues in benchmarking human reliability analysis methods : a literature review.  

SciTech Connect (OSTI)

There is a diversity of human reliability analysis (HRA) methods available for use in assessing human performance within probabilistic risk assessment (PRA). Due to the significant differences in the methods, including the scope, approach, and underlying models, there is a need for an empirical comparison investigating the validity and reliability of the methods. To accomplish this empirical comparison, a benchmarking study is currently underway that compares HRA methods with each other and against operator performance in simulator studies. In order to account for as many effects as possible in the construction of this benchmarking study, a literature review was conducted, reviewing past benchmarking studies in the areas of psychology and risk assessment. A number of lessons learned through these studies are presented in order to aid in the design of future HRA benchmarking endeavors.

Lois, Erasmia (US Nuclear Regulatory Commission); Forester, John Alan; Tran, Tuan Q. (Idaho National Laboratory, Idaho Falls, ID); Hendrickson, Stacey M. Langfitt; Boring, Ronald L. (Idaho National Laboratory, Idaho Falls, ID)

2008-04-01T23:59:59.000Z

257

Reliability estimates for selected sensors in fusion applications  

SciTech Connect (OSTI)

This report presents the results of a study to define several types of sensors in use, the qualitative reliability (failure modes) and quantitative reliability (average failure rates) for these types of process sensors. Temperature, pressure, flow, and level sensors are discussed for water coolant and for cryogenic coolants. The failure rates that have been found are useful for risk assessment and safety analysis. Repair times and calibration intervals are also given when found in the literature. All of these values can also be useful to plant operators and maintenance personnel. Designers may be able to make use of these data when planning systems. The final chapter in this report discusses failure rates for several types of personnel safety sensors, including ionizing radiation monitors, toxic and combustible gas detectors, humidity sensors, and magnetic field sensors. These data could be useful to industrial hygienists and other safety professionals when designing or auditing for personnel safety.

Cadwallader, L.C.

1996-09-01T23:59:59.000Z

258

Reliability Meets Big Data: Opportunities and Challenges  

E-Print Network [OSTI]

products, the nature of field reliability data is changing dramatically. In particular, products can 1, 2013 Abstract Reliability field data such as that obtained from warranty claims and maintenance, however, many other potential applications for using such data. In this paper we review some applications

McCalley, James D.

259

Demand Response and Electric Grid Reliability  

E-Print Network [OSTI]

Demand Response and Electric Grid Reliability Paul Wattles Senior Analyst, Market Design & Development, ERCOT CATEE Conference, Galveston October 10, 2012 2 North American Bulk Power Grids CATEE Conference October 10, 2012 ? The ERCOT... adequacy ? ?Achieving more DR participation would . . . displace some generation investments, but would achieve the same level of reliability... ? ?Achieving this ideal requires widespread demand response and market structures that enable loads...

Wattles, P.

2012-01-01T23:59:59.000Z

260

Engineering Reliability into Web Sites: Google SRE  

E-Print Network [OSTI]

Engineering Reliability into Web Sites: Google SRE Alex Perry alex.perry@google.com Santa Monica SRE, Google #12;Abstract This talk introduces Site Reliability Engineering (SRE) at Google, explaining team responsibilities by site Failures and instability consuming manpower Engineering being applied

Tomkins, Andrew

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Reliable Distributed Computing for Decision Support Systems  

E-Print Network [OSTI]

Reliable Distributed Computing for Decision Support Systems Taha Osman, Andrzej Bargiela Department of application tasks on the currently avail- able computing nodes. Distributed Systems Reliability Due decision-support systems such as water distribution net- works, involving hundreds or even thousands

Bargiela, Andrzej

262

Data Communication Principles Reliable Data Transfer  

E-Print Network [OSTI]

Principles Switching Reliable Data Transfer Data Rate of a Communication Channel Transmission Media Data Principles Switching Reliable Data Transfer Data Rate of a Communication Channel Transmission Media Data Transmission Fiber vs Copper Wire Weight vs bandwidth Cost Security 11 / 52 #12;Data Communication Principles

Ramkumar, Mahalingam

263

Wind Energy Facility Reliability and Maintenance  

E-Print Network [OSTI]

Wind Energy Facility Reliability and Maintenance Eunshin Byon, Lewis Ntaimo, Chanan Singh and Yu related to wind energy facility reliability and mainte- nance focused more on qualitative aspects. In this chapter, we provide a comprehensive account of the existing research regarding wind energy facility

Ding, Yu

264

Wind energy Computerized Maintenance Management System (CMMS) : data collection recommendations for reliability analysis.  

SciTech Connect (OSTI)

This report addresses the general data requirements for reliability analysis of fielded wind turbines and other wind plant equipment. The report provides a rationale for why this data should be collected, a list of the data needed to support reliability and availability analysis, and specific data recommendations for a Computerized Maintenance Management System (CMMS) to support automated analysis. This data collection recommendations report was written by Sandia National Laboratories to address the general data requirements for reliability analysis of operating wind turbines. This report is intended to help develop a basic understanding of the data needed for reliability analysis from a Computerized Maintenance Management System (CMMS) and other data systems. The report provides a rationale for why this data should be collected, a list of the data needed to support reliability and availability analysis, and specific recommendations for a CMMS to support automated analysis. Though written for reliability analysis of wind turbines, much of the information is applicable to a wider variety of equipment and analysis and reporting needs. The 'Motivation' section of this report provides a rationale for collecting and analyzing field data for reliability analysis. The benefits of this type of effort can include increased energy delivered, decreased operating costs, enhanced preventive maintenance schedules, solutions to issues with the largest payback, and identification of early failure indicators.

Peters, Valerie A.; Ogilvie, Alistair B.

2012-01-01T23:59:59.000Z

265

Development of Characterization Tools for Reliability Testing of MicroElectroMechanical System Actuators  

SciTech Connect (OSTI)

Characterization tools have been developed to study the performance characteristics and reliability of surface micromachined actuators. These tools include (1) the ability to electrically stimulate or stress the actuator, (2) the capability to visually inspect the devices in operation, (3) a method for capturing operational information, and (4) a method to extract performance characteristics from the operational information. Additionally, a novel test structure has been developed to measure electrostatic forces developed by a comb drive actuator.

Allen, James J.; Eaton, William P.; Smith, Norman F.; Tanner, Danelle M.

1999-07-26T23:59:59.000Z

266

Reliability analysis for wind turbines with incomplete failure data collected from after the date of initial installation  

E-Print Network [OSTI]

Reliability analysis for wind turbines with incomplete failure data collected from after the date model Maximum likelihood Least squares Wind turbines a b s t r a c t Reliability has an impact on wind analysis. In wind energy industry, wind farm operators have greater interest in recording wind turbine

McCalley, James D.

267

OPTIMAL RELIABILITY ALLOCATION IN SERIES-PARALLEL SYSTEMS FROM COMPONENTS' DISCRETE COST -RELIABILITY DATA SETS  

E-Print Network [OSTI]

OPTIMAL RELIABILITY ALLOCATION IN SERIES-PARALLEL SYSTEMS FROM COMPONENTS' DISCRETE COST - RELIABILITY DATA SETS: A NESTED SIMULATED ANNEALING APPROACH Subba Rao V. Majety# , Srikanth It is generally accepted that a component's cost is an increasing function of its reliability. Most researchers

Smith, Alice E.

268

Accepted for publication in Reliability Engineering and System Safety Analyzing the topological, electrical and reliability  

E-Print Network [OSTI]

Accepted for publication in Reliability Engineering and System Safety Analyzing the topological, electrical and reliability characteristics of a power transmission system for identifying its critical of the system the reliability and electrical characteristics of its components. In each phase of the analysis: i

Paris-Sud XI, Université de

269

Reliable and Semi-reliable Communication with Authentication in Mobile Ad Hoc Networks  

E-Print Network [OSTI]

Reliable and Semi-reliable Communication with Authentication in Mobile Ad Hoc Networks Falko of wireless ad hoc sensor networks is the error-proneness and, therefore, the unreliability of communication describe a new approach and an according protocol for usage in ad hoc networks that provides reliable

Breu, Ruth

270

Operation of orifice meter chart integrators  

SciTech Connect (OSTI)

When properly maintained and operated, the chart integrator can provide reliable chart integration for many years. The overall accuracy of the integration process win be determined by the proficiency of the operator as well as the upkeep and calibration of the chart integrator.

Gray, C. [EMC Services Co., Inc., Arlington, TX (United States)

1995-12-01T23:59:59.000Z

271

Waste tank characterization sampling limits  

SciTech Connect (OSTI)

This document is a result of the Plant Implementation Team Investigation into delayed reporting of the exotherm in Tank 241-T-111 waste samples. The corrective actions identified are to have immediate notification of appropriate Tank Farm Operations Shift Management if analyses with potential safety impact exceed established levels. A procedure, WHC-IP-0842 Section 12.18, ``TWRS Approved Sampling and Data Analysis by Designated Laboratories`` (WHC 1994), has been established to require all tank waste sampling (including core, auger and supernate) and tank vapor samples be performed using this document. This document establishes levels for specified analysis that require notification of the appropriate shift manager. The following categories provide numerical values for analysis that may indicate that a tank is either outside the operating specification or should be evaluated for inclusion on a Watch List. The information given is intended to translate an operating limit such as heat load, expressed in Btu/hour, to an analysis related limit, in this case cesium-137 and strontium-90 concentrations. By using the values provided as safety flags, the analytical laboratory personnel can notify a shift manager that a tank is in potential violation of an operating limit or that a tank should be considered for inclusion on a Watch List. The shift manager can then take appropriate interim measures until a final determination is made by engineering personnel.

Tusler, L.A.

1994-09-02T23:59:59.000Z

272

Electric Power Infrastructure Reliability and Security (EPIRS) Reseach and Development Initiative  

SciTech Connect (OSTI)

Power systems have become increasingly complex and face unprecedented challenges posed by population growth, climate change, national security issues, foreign energy dependence and an aging power infrastructure. Increased demand combined with increased economic and environmental constraints is forcing state, regional and national power grids to expand supply without the large safety and stability margins in generation and transmission capacity that have been the rule in the past. Deregulation, distributed generation, natural and man-made catastrophes and other causes serve to further challenge and complicate management of the electric power grid. To meet the challenges of the 21st century while also maintaining system reliability, the electric power grid must effectively integrate new and advanced technologies both in the actual equipment for energy conversion, transfer and use, and in the command, control, and communication systems by which effective and efficient operation of the system is orchestrated - in essence, the 'smart grid'. This evolution calls for advances in development, integration, analysis, and deployment approaches that ultimately seek to take into account, every step of the way, the dynamic behavior of the system, capturing critical effects due to interdependencies and interaction. This approach is necessary to better mitigate the risk of blackouts and other disruptions and to improve the flexibility and capacity of the grid. Building on prior Navy and Department of Energy investments in infrastructure and resources for electric power systems research, testing, modeling, and simulation at the Florida State University (FSU) Center for Advanced Power Systems (CAPS), this project has continued an initiative aimed at assuring reliable and secure grid operation through a more complete understanding and characterization of some of the key technologies that will be important in a modern electric system, while also fulfilling an education and outreach mission to provide future energy workforce talent and support the electric system stakeholder community. Building upon and extending portions of that research effort, this project has been focused in the following areas: (1) Building high-fidelity integrated power and controls hardware-in-the-loop research and development testbed capabilities (Figure 1). (2) Distributed Energy Resources Integration - (a) Testing Requirements and Methods for Fault Current Limiters, (b) Contributions to the Development of IEEE 1547.7, (c) Analysis of a STATCOM Application for Wind Resource Integration, (d) Development of a Grid-Interactive Inverter with Energy Storage Elements, (e) Simulation-Assisted Advancement of Microgrid Understanding and Applications; (3) Availability of High-Fidelity Dynamic Simulation Tools for Grid Disturbance Investigations; (4) HTS Material Characterization - (a) AC Loss Studies on High Temperature Superconductors, (b) Local Identification of Current-Limiting Mechanisms in Coated Conductors; (5) Cryogenic Dielectric Research; and (6) Workshops, education, and outreach.

Rick Meeker; L. Baldwin; Steinar Dale; Alexander Domijan; Davild Larbalestier; Hui Li; Peter McLaren; Sastry Pamidi; Horatio Rodrigo; Michael Steurer

2010-03-31T23:59:59.000Z

273

Blade reliability collaborative : collection of defect, damage and repair data.  

SciTech Connect (OSTI)

The Blade Reliability Collaborative (BRC) was started by the Wind Energy Technologies Department of Sandia National Laboratories and DOE in 2010 with the goal of gaining insight into planned and unplanned O&M issues associated with wind turbine blades. A significant part of BRC is the Blade Defect, Damage and Repair Survey task, which will gather data from blade manufacturers, service companies, operators and prior studies to determine details about the largest sources of blade unreliability. This report summarizes the initial findings from this work.

Ashwill, Thomas D.; Ogilvie, Alistair B.; Paquette, Joshua A.

2013-04-01T23:59:59.000Z

274

Reliability Results of NERSC Systems  

SciTech Connect (OSTI)

In order to address the needs of future scientific applications for storing and accessing large amounts of data in an efficient way, one needs to understand the limitations of current technologies and how they may cause systeminstability or unavailability. A number of factors can impact system availability ranging from facility-wide power outage to a single point of failure such as network switches or global file systems. In addition, individual component failure in a system can degrade the performance of that system. This paper focuses on analyzing both of these factors and their impacts on the computational and storage systems at NERSC. Component failure data presented in this report primarily focuses on disk drive in on of the computational system and tape drive failure in HPSS. NERSC collected available component failure data and system-wide outages for its computational and storage systems over a six-year period and made them available to the HPC community through the Petascale Data Storage Institute.

Petascale Data Storage Institute (PDSI); Mokhtarani, Akbar; Mokhtarani, Akbar; Kramer, William; Hick, Jason

2008-05-27T23:59:59.000Z

275

Steam turbine blade reliability seminar and workshop: proceedings  

SciTech Connect (OSTI)

An EPRI workshop to address steam turbine blade reliability improvement was cohosted by Boston Edison Company in Boston, Massachusetts on July 7-9, 1982. The 142 attendees represented a broad spectrum of US utilities, equipment manufacturers, and consultants, as well as representatives from Canada, Europe, and Japan. These proceedings contain the text of the formal presentations as well as summaries of the working group sessions which were devoted to topics of particular interest to the workshop participants. The formal presentations were organized under the following general session titles: utility experience with turbine blades; blade failure mechanisms and causes; blade design for high reliability; problem solutions for operating units; and failure analysis, NDE, and diagnostics. In addition to the technical presentations, working group sessions were held on selected topics relevant to steam turbine blade reliability improvement. Each group provided a forum for engineers to exchange ideas and information in a less formal environment. These discussions focused on key issues in more detail and addressed some subjects not covered in the formal presentations. The subjects of these working groups were: low pressure turbine blade problems; solid particle erosion; steam chemistry; failure analysis, NDE, and diagnostics; effect of boiler and balance-of-plant; and retrofittable fixes for blade problems. Individual papers have been entered into EDB and ERA. (LTN)

Brown, R.G.; Quilliam, J.F. (eds.)

1985-07-01T23:59:59.000Z

276

Gearbox Reliability Collaborative Phase 3 Gearbox 2 Test Plan  

SciTech Connect (OSTI)

Gearboxes in wind turbines have not been achieving their expected design life even though they commonly meet or exceed the design criteria specified in current design standards. One of the basic premises of the National Renewable Energy Laboratory (NREL) Gearbox Reliability Collaborative (GRC) is that the low gearbox reliability results from the absence of critical elements in the design process or insufficient design tools. Key goals of the GRC are to improve design approaches and analysis tools and to recommend practices and test methods resulting in improved design standards for wind turbine gearboxes that lower the cost of energy (COE) through improved reliability. The GRC uses a combined gearbox testing, modeling and analysis approach, along with a database of information from gearbox failures collected from overhauls and investigation of gearbox condition monitoring techniques to improve wind turbine operations and maintenance practices. Testing of Gearbox 2 (GB2) using the two-speed turbine controller that has been used in prior testing. This test series will investigate non-torque loads, high-speed shaft misalignment, and reproduction of field conditions in the dynamometer. This test series will also include vibration testing using an eddy-current brake on the gearbox's high speed shaft.

Link, H.; Keller, J.; Guo, Y.; McNiff, B.

2013-04-01T23:59:59.000Z

277

NREL Collaborative Improves the Reliability of Wind Turbine Gearboxes (Fact Sheet)  

SciTech Connect (OSTI)

Gearbox failures have a significant impact on the cost of wind farm operations. To help minimize gearbox failures, in 2007 the National Renewable Energy Laboratory (NREL) initiated the Gearbox Reliability Collaborative (GRC), which consists of manufacturers, owners, researchers, and consultants. Based on all the lessons learned from the past five years, the GRC has now produced a new and improved design, which is projected to yield an operating lifetime of 12 years, more than triple that of the previous redesigned gearbox. The GRC findings will result in increased gearbox reliability and an overall reduction in the cost of wind energy.

Not Available

2013-09-01T23:59:59.000Z

278

Adaptive Reliability Analysis of Excavation Problems  

E-Print Network [OSTI]

. This analysis couples the adaptive design capabilities of the observational method with updated reliability indices, to be used in risk-based design decisions. A probabilistic framework is developed to predict three-dimensional deformation profiles due...

Park, Jun Kyung

2012-10-19T23:59:59.000Z

279

Reliability-Based Optimization Using Evolutionary Algorithms  

E-Print Network [OSTI]

Uncertainties in design variables and problem parameters are often inevitable and must be considered in an optimization task if reliable optimal solutions are sought. Besides a number of sampling techniques, there exist ...

Deb, Kalyanmoy

280

Photovoltaic Reliability and Engineering (Revised) (Fact Sheet)  

SciTech Connect (OSTI)

Capabilities fact sheet for the National Center for Photovoltaics: Photovoltaic Reliability and Engineering. One-sided sheet that includes Scope, Core Competencies and Capabilities, and Contact/Web information.

Not Available

2011-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Sandia National Laboratories: Physics of Reliability: Evaluating...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Physics of Reliability: Evaluating Design Insights for Component Technologies in Solar program Sandia R&D Funded under New DOE SunShot Program On November 27, 2013, in Energy,...

282

Reliability Issues for Photovoltaic Modules (Presentation)  

SciTech Connect (OSTI)

Si modules good in field; new designs need reliability testing. CdTe & CIGS modules sensitive to moisture; carefully seal. CPV in product development stage; benefits from expertise in other industries.

Kurtz, S.

2009-10-01T23:59:59.000Z

283

PV Module Reliability Research (Fact Sheet)  

SciTech Connect (OSTI)

This National Center for Photovoltaics sheet describes the capabilities of its PV module reliability research. The scope and core competencies and capabilities are discussed and recent publications are listed.

Not Available

2013-06-01T23:59:59.000Z

284

Demand Response For Power System Reliability: FAQ  

SciTech Connect (OSTI)

Demand response is the most underutilized power system reliability resource in North America. Technological advances now make it possible to tap this resource to both reduce costs and improve. Misconceptions concerning response capabilities tend to force loads to provide responses that they are less able to provide and often prohibit them from providing the most valuable reliability services. Fortunately this is beginning to change with some ISOs making more extensive use of load response. This report is structured as a series of short questions and answers that address load response capabilities and power system reliability needs. Its objective is to further the use of responsive load as a bulk power system reliability resource in providing the fastest and most valuable ancillary services.

Kirby, Brendan J [ORNL

2006-12-01T23:59:59.000Z

285

Reliability of copper interconnects in integrated circuits  

E-Print Network [OSTI]

As dimensions shrink and current densities increase, the reliability of metal interconnects becomes a serious concern. In copper interconnects, the dominant diffusion path is along the interface between the copper and the ...

Choi, Zung-Sun

2007-01-01T23:59:59.000Z

286

Reliability of lightning resistant overhead distribution lines  

SciTech Connect (OSTI)

An assessment of the 32 year historical reliability of the 13.8 kV electrical distribution system at the Oak Ridge National Laboratory (ORNL) in Tennessee has yielded several conclusions useful In the planning of Industrial power Systems. The system configuration at ORNL has essentially remained unchanged in the last 32 years which allows a meaningful comparison of reliability trends for the plant`s eight overhead distribution lines, two of which were built in the 1960`s with lightning resistant construction techniques. Meticulous records indicating the cause, duration, and location of 135 electric outages in the plant`s distribution system have allowed a reliability assessment to be performed. The assessment clearly shows how differences in voltage construction class, length, age, and maximum elevation above a reference elevation influence the reliability of overhead power distribution lines. Comparisons are also made between the ORNL historical data and predicted failure rates from ANSI and IEEE industry surveys.

Tolbert, L.M.; Cleveland, J.T.; Degenhardt, L.J.

1995-04-01T23:59:59.000Z

287

Gearbox Reliability Collaborative (GRC) Description and Loading  

SciTech Connect (OSTI)

This document describes simulated turbine load cases in accordance to the IEC 61400-1 Ed.3 standard, which is representative of the typical wind turbine design process. The information presented herein is intended to provide a broad understanding of the gearbox reliability collaborative 750kW drivetrain and turbine configuration. In addition, fatigue and ultimate strength drivetrain loads resulting from simulations are presented. This information provides the bases for the analytical work of the gearbox reliability collaborative effort.

Oyague, F.

2011-11-01T23:59:59.000Z

288

Reliability and Functional Availability of HVAC Systems  

E-Print Network [OSTI]

RELIABILITY AND FUNCTIONAL AVAILABILITY OF HVAC SYSTEMS Sonny Myrefelt Dep. of Build. Serv. Eng., KTH, 10044 Stockholm, Sweden, and SKANSKA Sydost, V?xj?, Sweden Summary This paper presents a model to calculate the reliability... system, therefore, there must be sufficient documentation of design airflow rates. The compulsory ventilation checks performed in Sweden have focused on the importance of maintaining the design air flow rates. More about this activity can be seen...

Myrefelt, S.

2004-01-01T23:59:59.000Z

289

Limitations and Opportunities of Off-Shell Coupling Measurements  

E-Print Network [OSTI]

Indirect constraints on the total Higgs width $\\Gamma_h$ from correlating Higgs signal strengths with cross section measurements in the off-shell region for $p(g)p(g)\\to 4\\ell$ production have received considerable attention recently, and the CMS collaboration have published a first measurement. We revisit this analysis from a new physics and unitarity constraints perspective and conclude that limits on $\\Gamma_h$ obtained in this fashion are not reliable unless we make model-specific assumptions, which cannot be justified at the current stage of the LHC programme. Relaxing the $\\Gamma_h$ interpretation, we discuss the merits of high invariant mass cross section measurements in the context of Higgs CP analyses, higher dimensional operator testing, and resolved new physics in the light of electroweak precision constraints beyond effective theory limitations. Furthermore, we show that a rather model-independent LHC constraint can be obtained from adapting the $gg\\to 4\\ell$ analysis to the weak boson fusion channels at lower statistical yield.

Christoph Englert; Michael Spannowsky

2014-08-28T23:59:59.000Z

290

-Reliability Patrick Th. Eugster Rachid Guerraoui Petr Kouznetsov  

E-Print Network [OSTI]

-Reliability Patrick Th. Eugster Rachid Guerraoui Petr Kouznetsov Swiss Federal Institute of the reliability of broadcast algorithms, called - Reliability. This measure quantifies the reliability of practical broadcast algorithms that, on the one hand, were devised with some form of reliability in mind

Guerraoui, Rachid

291

Final report : testing and evaluation for solar hot water reliability.  

SciTech Connect (OSTI)

Solar hot water (SHW) systems are being installed by the thousands. Tax credits and utility rebate programs are spurring this burgeoning market. However, the reliability of these systems is virtually unknown. Recent work by Sandia National Laboratories (SNL) has shown that few data exist to quantify the mean time to failure of these systems. However, there is keen interest in developing new techniques to measure SHW reliability, particularly among utilities that use ratepayer money to pay the rebates. This document reports on an effort to develop and test new, simplified techniques to directly measure the state of health of fielded SHW systems. One approach was developed by the National Renewable Energy Laboratory (NREL) and is based on the idea that the performance of the solar storage tank can reliably indicate the operational status of the SHW systems. Another approach, developed by the University of New Mexico (UNM), uses adaptive resonance theory, a type of neural network, to detect and predict failures. This method uses the same sensors that are normally used to control the SHW system. The NREL method uses two additional temperature sensors on the solar tank. The theories, development, application, and testing of both methods are described in the report. Testing was performed on the SHW Reliability Testbed at UNM, a highly instrumented SHW system developed jointly by SNL and UNM. The two methods were tested against a number of simulated failures. The results show that both methods show promise for inclusion in conventional SHW controllers, giving them advanced capability in detecting and predicting component failures.

Caudell, Thomas P. (University of New Mexico, Albuquerque, NM) [University of New Mexico, Albuquerque, NM; He, Hongbo (University of New Mexico, Albuquerque, NM) [University of New Mexico, Albuquerque, NM; Menicucci, David F. (Building Specialists, Inc., Albuquerque, NM) [Building Specialists, Inc., Albuquerque, NM; Mammoli, Andrea A. (University of New Mexico, Albuquerque, NM) [University of New Mexico, Albuquerque, NM; Burch, Jay (National Renewable Energy Laboratory, Golden CO) [National Renewable Energy Laboratory, Golden CO

2011-07-01T23:59:59.000Z

292

Measurement Practices for Reliability and Power Quality  

SciTech Connect (OSTI)

This report provides a distribution reliability measurement ''toolkit'' that is intended to be an asset to regulators, utilities and power users. The metrics and standards discussed range from simple reliability, to power quality, to the new blend of reliability and power quality analysis that is now developing. This report was sponsored by the Office of Electric Transmission and Distribution, U.S. Department of Energy (DOE). Inconsistencies presently exist in commonly agreed-upon practices for measuring the reliability of the distribution systems. However, efforts are being made by a number of organizations to develop solutions. In addition, there is growing interest in methods or standards for measuring power quality, and in defining power quality levels that are acceptable to various industries or user groups. The problems and solutions vary widely among geographic areas and among large investor-owned utilities, rural cooperatives, and municipal utilities; but there is still a great degree of commonality. Industry organizations such as the National Rural Electric Cooperative Association (NRECA), the Electric Power Research Institute (EPRI), the American Public Power Association (APPA), and the Institute of Electrical and Electronics Engineers (IEEE) have made tremendous strides in preparing self-assessment templates, optimization guides, diagnostic techniques, and better definitions of reliability and power quality measures. In addition, public utility commissions have developed codes and methods for assessing performance that consider local needs. There is considerable overlap among these various organizations, and we see real opportunity and value in sharing these methods, guides, and standards in this report. This report provides a ''toolkit'' containing synopses of noteworthy reliability measurement practices. The toolkit has been developed to address the interests of three groups: electric power users, utilities, and regulators. The report will also serve to support activities to develop and share information among industry and regulatory participants about critical resources and practices. The toolkit has been developed by investigating the status of indices and definitions, surveying utility organizations on information sharing, and preparing summaries of reliability standards and monitoring requirements--the issues, needs, work under way, existing standards, practices and guidelines--for the following three classifications: (1) terms and definitions of reliability; (2) power quality standards, guidelines, and measurements; and (3) activities and organizations developing and sharing information on distribution reliability. As these synopses of reliability measurement practices are provided, it must be noted that an economic penalty may be associated with requiring too high a reliability level from the distribution system for all customers. It may be appropriate for the distribution system to supply only some base, generally accepted level of reliability. This base level would be adequate for the majority of customers. Users who need a higher level may find it economical to supply using distributed energy resources (DER) and other local solutions to reliability and power quality needs. Local solutions implemented by the customer may be the most cost-effective method for addressing the more stringent needs of a digital economy. These local solutions include energy storage, small distributed generators, and microgrids. This report also considers the market's role in addressing reliability issues and requirements. The customer's needs are discussed in view of issues such as power quality requirements of digital electronic equipment, the cost of outages, the cost of storage and new infrastructure, and natural gas prices. The market role in addressing these issues and requirements is explored. The economic considerations associated with the reliability issues are discussed, as well as the levels at which these economic decisions could be made. Finally, a discussion is provided of the role DER could play in addressing

Kueck, JD

2005-05-06T23:59:59.000Z

293

Service experience and reliability improvement: Nuclear, fossil, and petrochemical plants  

SciTech Connect (OSTI)

This publication contains papers presented at the following four symposia conducted at the 1994 Pressure Vessels and Piping Conference in Minneapolis, Minnesota, June 19--23: Service Experience in Nuclear Plants; Risk-Based Inspection and Evaluation; Service Experience in Operating Fossil Power Plants; and Service Experience in Petrochemical Plants. These symposia were sponsored by the Materials and Fabrication and the Design and Analysis Committees of the ASME Pressure Vessels and Piping Division. The objective of these symposia was to disseminate information on issues and degradation that have resulted from the operation of nuclear, fossil, and petrochemical power plants, as well as related reliability issues. Thirty-nine papers have been processed separately for inclusion on the data base.

Bamford, W.H.; Cipolla, R.C.; Warke, W.R.; Onyewuenyi, O.A.; Bagnoli, D.; Phillips, J.H.; Prager, M.; Becht, C. IV (eds.)

1994-01-01T23:59:59.000Z

294

On the problem of reliable stabilization for large power systems  

E-Print Network [OSTI]

, the electric power systems such as the Eastern/Western North American grids and European grid have experienced, and moreover pushed the networks to their operational limits. Besides, the integration of land-based/offshore dynamics as well as on the load flow of the system. On the other hand, the transmission grids have seen

Antsaklis, Panos

295

The SACADA database for human reliability and human performance  

SciTech Connect (OSTI)

Lack of appropriate and sufficient human performance data has been identified as a key factor affecting human reliability analysis (HRA) quality especially in the estimation of human error probability (HEP). The Scenario Authoring, Characterization, and Debriefing Application (SACADA) database was developed by the U.S. Nuclear Regulatory Commission (NRC) to address this data need. An agreement between NRC and the South Texas Project Nuclear Operating Company (STPNOC) was established to support the SACADA development with aims to make the SACADA tool suitable for implementation in the nuclear power plants' operator training program to collect operator performance information. The collected data would support the STPNOC's operator training program and be shared with the NRC for improving HRA quality. This paper discusses the SACADA data taxonomy, the theoretical foundation, the prospective data to be generated from the SACADA raw data to inform human reliability and human performance, and the considerations on the use of simulator data for HRA. Each SACADA data point consists of two information segments: context and performance results. Context is a characterization of the performance challenges to task success. The performance results are the results of performing the task. The data taxonomy uses a macrocognitive functions model for the framework. At a high level, information is classified according to the macrocognitive functions of detecting the plant abnormality, understanding the abnormality, deciding the response plan, executing the response plan, and team related aspects (i.e., communication, teamwork, and supervision). The data are expected to be useful for analyzing the relations between context, error modes and error causes in human performance.

Y. James Chang; Dennis Bley; Lawrence Criscione; Barry Kirwan; Ali Mosleh; Todd Madary; Rodney Nowell; Robert Richards; Emilie M. Roth; Scott Sieben; Antonios Zoulis

2014-05-01T23:59:59.000Z

296

Passive fault current limiting device  

DOE Patents [OSTI]

A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment. 6 figs.

Evans, D.J.; Cha, Y.S.

1999-04-06T23:59:59.000Z

297

Reliability Analysis of Electric Power Systems Using an Object-oriented Hybrid Modeling Approach  

E-Print Network [OSTI]

The ongoing evolution of the electric power systems brings about the need to cope with increasingly complex interactions of technical components and relevant actors. In order to integrate a more comprehensive spectrum of different aspects into a probabilistic reliability assessment and to include time-dependent effects, this paper proposes an object-oriented hybrid approach combining agent-based modeling techniques with classical methods such as Monte Carlo simulation. Objects represent both technical components such as generators and transmission lines and non-technical components such as grid operators. The approach allows the calculation of conventional reliability indices and the estimation of blackout frequencies. Furthermore, the influence of the time needed to remove line overloads on the overall system reliability can be assessed. The applicability of the approach is demonstrated by performing simulations on the IEEE Reliability Test System 1996 and on a model of the Swiss high-voltage grid.

Schlpfer, Markus; Krger, Wolfgang

2012-01-01T23:59:59.000Z

298

Reliability of EUCLIDIAN: An autonomous robotic system for image-guided prostate brachytherapy  

SciTech Connect (OSTI)

Purpose: Recently, several robotic systems have been developed to perform accurate and consistent image-guided brachytherapy. Before introducing a new device into clinical operations, it is important to assess the reliability and mean time before failure (MTBF) of the system. In this article, the authors present the preclinical evaluation and analysis of the reliability and MTBF of an autonomous robotic system, which is developed for prostate seed implantation. Methods: The authors have considered three steps that are important in reliability growth analysis. These steps are: Identification and isolation of failures, classification of failures, and trend analysis. For any one-of-a-kind product, the reliability enhancement is accomplished through test-fix-test. The authors have used failure mode and effect analysis for collection and analysis of reliability data by identifying and categorizing the failure modes. Failures were classified according to severity. Failures that occurred during the operation of this robotic system were considered as nonhomogenous Poisson process. The failure occurrence trend was analyzed using Laplace test. For analyzing and predicting reliability growth, commonly used and widely accepted models, Duane's model and the Army Material Systems Analysis Activity, i.e., Crow's model, were applied. The MTBF was used as an important measure for assessing the system's reliability. Results: During preclinical testing, 3196 seeds (in 53 test cases) were deposited autonomously by the robot and 14 critical failures were encountered. The majority of the failures occurred during the first few cases. The distribution of failures followed Duane's postulation as well as Crow's postulation of reliability growth. The Laplace test index was -3.82 (<0), indicating a significant trend in failure data, and the failure intervals lengthened gradually. The continuous increase in the failure occurrence interval suggested a trend toward improved reliability. The MTBF was 592 seeds, which implied that several prostate seed implantation cases would be possible without encountering any critical failure. The shape parameter for the MTBF was 0.3859 (<1), suggesting a positive reliability growth of this robotic system. At 95% confidence, the reliability for deposition of 65 seeds was more than 90%. Conclusions: Analyses of failure mode strongly indicated a gradual improvement of reliability of this autonomous robotic system. High MTBF implied that several prostate seed implant cases would be possible without encountering any critical failure.

Podder, Tarun K.; Buzurovic, Ivan; Huang Ke; Showalter, Timothy; Dicker, Adam P.; Yu, Yan [Department of Radiation Oncology, Kimmel Cancer Center (NCI-designated), Thomas Jefferson University, Philadelphia, Pennsylvania 19107 (United States)

2011-01-15T23:59:59.000Z

299

RELIABILITY OF WIND POWER FROM DISPERSED SITES: A PRELIMINARY ASSESSMENT  

E-Print Network [OSTI]

addresses itself to the reliability benefit of geograph-is a function of its reliability. typically want electricityI..I.ND DOCUMENTS SCTION Reliability of Wind Power From

Kahn, E.

2011-01-01T23:59:59.000Z

300

Reliability Based Vegetation Management Through Intelligent System Monitoring  

E-Print Network [OSTI]

Reliability Based Vegetation Management Through Intelligent System Monitoring Final Project Report Research Center since 1996 PSERC #12;Power Systems Engineering Research Center Reliability Based Vegetation project titled "Reliability Based Vegetation Maintenance Through Intelligent System Monitoring (T-27)." We

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Reliability of ENSO Dynamical Predictions YOUMIN TANG AND RICHARD KLEEMAN  

E-Print Network [OSTI]

Reliability of ENSO Dynamical Predictions YOUMIN TANG AND RICHARD KLEEMAN Courant Institute, the authors have explored several important issues relating to ENSO predictability including reliability measures of ENSO dynamical predictions and the dominant precursors that control reliability. It was found

Tang, Youmin

302

Reliability based assessment of FRP rehabilitation of reinforced concrete girders  

E-Print Network [OSTI]

J.P. SE 224 Structural Reliability and Risk Analysis, CourseL.A. Statistical Methods for Reliability Data. AppliedA.S. ; Collins, K.R. Reliability of Structures; McGraw-Hill

Wilcox, Patrick Carlo

2008-01-01T23:59:59.000Z

303

OPERATIONS (OPS)  

Broader source: Energy.gov (indexed) [DOE]

OPS) OBJECTIVE OPS.1 The formality and discipline of operations is adequate to conduct work safely and programs are in place to maintain this formality and discipline. (CR 13)...

304

Design operators  

E-Print Network [OSTI]

Design operators is a thesis that investigates the nature and characteristics of the design process by examining the interaction of computation with architectural design. The effects of the introduction of these media in ...

Dritsas, Stylianos, 1978-

2004-01-01T23:59:59.000Z

305

Operating Costs  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This chapter is focused on capital costs for conventional construction and environmental restoration and waste management projects and examines operating cost estimates to verify that all elements of the project have been considered and properly estimated.

1997-03-28T23:59:59.000Z

306

Culture Representation in Human Reliability Analysis  

SciTech Connect (OSTI)

Understanding human-system response is critical to being able to plan and predict mission success in the modern battlespace. Commonly, human reliability analysis has been used to predict failures of human performance in complex, critical systems. However, most human reliability methods fail to take culture into account. This paper takes an easily understood state of the art human reliability analysis method and extends that method to account for the influence of culture, including acceptance of new technology, upon performance. The cultural parameters used to modify the human reliability analysis were determined from two standard industry approaches to cultural assessment: Hofstedes (1991) cultural factors and Davis (1989) technology acceptance model (TAM). The result is called the Culture Adjustment Method (CAM). An example is presented that (1) reviews human reliability assessment with and without cultural attributes for a Supervisory Control and Data Acquisition (SCADA) system attack, (2) demonstrates how country specific information can be used to increase the realism of HRA modeling, and (3) discusses the differences in human error probability estimates arising from cultural differences.

David Gertman; Julie Marble; Steven Novack

2006-12-01T23:59:59.000Z

307

Integration of NDE Reliability and Fracture Mechanics  

SciTech Connect (OSTI)

The Pacific Northwest Laboratory is conducting a four-phase program for measuring and evaluating the effectiveness and reliability of in-service inspection (lSI} performed on the primary system piping welds of commercial light water reactors (LWRs). Phase I of the program is complete. A survey was made of the state of practice for ultrasonic rsr of LWR primary system piping welds. Fracture mechanics calculations were made to establish required nondestrutive testing sensitivities. In general, it was found that fatigue flaws less than 25% of wall thickness would not grow to failure within an inspection interval of 10 years. However, in some cases failure could occur considerably faster. Statistical methods for predicting and measuring the effectiveness and reliability of lSI were developed and will be applied in the "Round Robin Inspections" of Phase II. Methods were also developed for the production of flaws typical of those found in service. Samples fabricated by these methods wilI be used in Phase II to test inspection effectiveness and reliability. Measurements were made of the influence of flaw characteristics {i.e., roughness, tightness, and orientation) on inspection reliability. These measurernents, as well as the predictions of a statistical model for inspection reliability, indicate that current reporting and recording sensitivities are inadequate.

Becker, F. L.; Doctor, S. R.; Heas!er, P. G.; Morris, C. J.; Pitman, S. G.; Selby, G. P.; Simonen, F. A.

1981-03-01T23:59:59.000Z

308

Transmission Reliability "Load as a Resource" Peer Review Materials...  

Broader source: Energy.gov (indexed) [DOE]

Transmission Reliability "Load as a Resource" Peer Review Materials Now Available Transmission Reliability "Load as a Resource" Peer Review Materials Now Available September 25,...

309

BPA Fact Sheet - Preparing for reliability entity registration...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Preparing for reliability entity registration Based on the NERC Functional Model The Energy Policy Act of 2005 (EPAct 2005) strongly emphasized reliability of the nation's bulk...

310

Reliability of islanded microgrids with stochastic generation and prioritized load  

E-Print Network [OSTI]

The potential to improve distribution system reliability is a primary motivation behind the development and deployment of microgrids. Previous studies have illustrated substantial reliability benefits of dispatchable ...

Marden, Mirjana Milosevic

311

The Business Case for Fuel Cells 2013: Reliability, Resiliency...  

Broader source: Energy.gov (indexed) [DOE]

3: Reliability, Resiliency & Savings The Business Case for Fuel Cells 2013: Reliability, Resiliency & Savings This report, compiled by Fuel Cells 2000 with support from the Fuel...

312

Reliability Tools for Resonance Inspection of Light Metal Castings...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Reliability Tools for Resonance Inspection of Light Metal Castings Reliability Tools for Resonance Inspection of Light Metal Castings 2012 DOE Hydrogen and Fuel Cells Program and...

313

Now Available: Smart Grid Investments Improve Grid Reliability...  

Energy Savers [EERE]

Smart Grid Investments Improve Grid Reliability, Resilience, and Storm Responses (November 2014) Now Available: Smart Grid Investments Improve Grid Reliability, Resilience, and...

314

Texas Uses Phasors to Increase Electricity Reliability | Department...  

Broader source: Energy.gov (indexed) [DOE]

Texas Uses Phasors to Increase Electricity Reliability Texas Uses Phasors to Increase Electricity Reliability March 31, 2011 - 12:57pm Addthis Merrill Smith Program Manager, Office...

315

Agenda for the PV Module Reliability Workshop, February 26 -...  

Broader source: Energy.gov (indexed) [DOE]

Agenda for the PV Module Reliability Workshop, February 26 - 27 2013, Golden, Colorado Agenda for the PV Module Reliability Workshop, February 26 - 27 2013, Golden, Colorado This...

316

Letter from Pepco Holdings Regarding the Reliability of Electric...  

Broader source: Energy.gov (indexed) [DOE]

from Pepco Holdings Regarding the Reliability of Electric Service in the District of Columbia Letter from Pepco Holdings Regarding the Reliability of Electric Service in the...

317

High Reliability, High TemperatureThermoelectric Power Generation...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Reliability, High TemperatureThermoelectric Power Generation Materials and Technologies High Reliability, High TemperatureThermoelectric Power Generation Materials and Technologies...

318

Guide to Using Combined Heat and Power for Enhancing Reliability...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Guide to Using Combined Heat and Power for Enhancing Reliability and Resiliency in Buildings Guide to Using Combined Heat and Power for Enhancing Reliability and Resiliency in...

319

Combined Heat and Power System Enables 100% Reliability at Leading...  

Broader source: Energy.gov (indexed) [DOE]

Enables 100% Reliability at Leading Medical Campus - Case Study, 2013 Combined Heat and Power System Enables 100% Reliability at Leading Medical Campus - Case Study, 2013 Thermal...

320

Effect of Jatropha based Biodiesel, on Engine Hardware Reliability...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Jatropha based Biodiesel, on Engine Hardware Reliability, Emission and Performance Effect of Jatropha based Biodiesel, on Engine Hardware Reliability, Emission and Performance...

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Office of Electricity Delivery and Energy Reliability Recovery...  

Broader source: Energy.gov (indexed) [DOE]

Electricity Delivery and Energy Reliability Recovery Program Plan Office of Electricity Delivery and Energy Reliability Recovery Program Plan Microsoft Word - OE PSRP June 5 2009...

322

The Office of Electricity Delivery and Energy Reliability is...  

Broader source: Energy.gov (indexed) [DOE]

The Office of Electricity Delivery and Energy Reliability is Closely Monitoring Hurricane Irene (2011) The Office of Electricity Delivery and Energy Reliability is Closely...

323

Office of Electricity Delivery & Energy Reliability FY 2012 Budget...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Office of Electricity Delivery & Energy Reliability FY 2012 Budget Request Presentation Office of Electricity Delivery & Energy Reliability FY 2012 Budget Request Presentation...

324

Office of Electricity Delivery and Energy Reliability Cyber Security...  

Broader source: Energy.gov (indexed) [DOE]

Office of Electricity Delivery and Energy Reliability Cyber Security Project Selections Office of Electricity Delivery and Energy Reliability Cyber Security Project Selections On...

325

Summary of Dissolved Concentration Limits  

SciTech Connect (OSTI)

According to the Technical Work Plan titled Technical Work Plan for Waste Form Degradation Process Model Report for SR (CRWMS M&O 2000a), the purpose of this study is to perform abstractions on solubility limits of radioactive elements based on the process-level information and thermodynamic databases provided by Natural Environment Program Operations (NEPO) and Waste Package Operations (WPO). The scope of this analysis is to produce solubility limits as functions, distributions, or constants for all transported radioactive elements identified by the Performance Assessment Operations (PAO) radioisotope screening. Results from an expert elicitation for solubility limits of most radioactive elements were used in the previous Total System Performance Assessments (TSPAs). However, the elicitation conducted in 1993 does not meet the criteria set forth by the U.S. Nuclear Regulatory Commission (NRC) due to lack of documentation and traceability (Kotra et al. 1996, Section 3). Therefore, at the Waste Form Abstraction Workshop held on February 2-4, 1999, at Albuquerque, New Mexico, the Yucca Mountain Site Characterization Project (YMP) decided to develop geochemical models to study solubility for the proposed Monitored Geologic Repository. WPO/NEPO is to develop process-level solubility models, including review and compilation of relevant thermodynamic data. PAO's responsibility is to perform abstractions based on the process models and chemical conditions and to produce solubility distributions or response surfaces applicable to the proposed repository. The results of this analysis and conceptual model will feed the performance assessment for Total System Performance Assessment--Site Recommendation (TSPA-SR) and Total System Performance Assessment--License Application (TSPA-LA), and to the Waste Form Degradation Process Model Report section on concentration limits.

Yueting Chen

2001-06-11T23:59:59.000Z

326

Technique for Measuring Hybrid Electronic Component Reliability  

SciTech Connect (OSTI)

Materials compatibility studies of aged, engineered materials and hardware are critical to understanding and predicting component reliability, particularly for systems with extended stockpile life requirements. Nondestructive testing capabilities for component reliability would significantly enhance lifetime predictions. For example, if the detection of crack propagation through a solder joint can be demonstrated, this technique could be used to develop baseline information to statistically determine solder joint lifelengths. This report will investigate high frequency signal response techniques for nondestructively evaluating the electrical behavior of thick film hybrid transmission lines.

Green, C.C.; Hernandez, C.L.; Hosking, F.M.; Robinson, D.; Rutherford, B.; Uribe, F.

1999-01-01T23:59:59.000Z

327

Sandia National Laboratories: PV Systems Reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLSMolten-SaltReliability PV Systems Reliability Sandia recognizes

328

Sandia National Laboratories: PV Systems Reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLSMolten-SaltReliability PV Systems Reliability Sandia

329

Sandia National Laboratories: Inverter Reliability Program  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLS Exhibit atVehicleEnergyPolydotsMicroReliabilityReliability

330

Bridging Human Reliability Analysis and Psychology, Part 1: The Psychological Literature Review for the IDHEAS Method  

SciTech Connect (OSTI)

In response to Staff Requirements Memorandum (SRM) SRM-M061020, the U.S. Nuclear Regulatory Commission (NRC) is sponsoring work to update the technical basis underlying human reliability analysis (HRA) in an effort to improve the robustness of HRA. The ultimate goal of this work is to develop a hybrid of existing methods addressing limitations of current HRA models and in particular issues related to intra- and inter-method variabilities and results. This hybrid method is now known as the Integrated Decision-tree Human Event Analysis System (IDHEAS). Existing HRA methods have looked at elements of the psychological literature, but there has not previously been a systematic attempt to translate the complete span of cognition from perception to action into mechanisms that can inform HRA. Therefore, a first step of this effort was to perform a literature search of psychology, cognition, behavioral science, teamwork, and operating performance to incorporate current understanding of human performance in operating environments, thus affording an improved technical foundation for HRA. However, this literature review went one step further by mining the literature findings to establish causal relationships and explicit links between the different types of human failures, performance drivers and associated performance measures ultimately used for quantification. This is the first of two papers that detail the literature review (paper 1) and its product (paper 2). This paper describes the literature review and the high-level architecture used to organize the literature review, and the second paper (Whaley, Hendrickson, Boring, & Xing, these proceedings) describes the resultant cognitive framework.

April M. Whaley; Stacey M. L. Hendrickson; Ronald L. Boring; Jeffrey C. Joe; Katya L. Le Blanc; Jing Xing

2012-06-01T23:59:59.000Z

331

November 18, 2008 1 Abstract--In this paper, we analyze the N-1 reliable DC optimal  

E-Print Network [OSTI]

of the transmission element (line or transformer) and the model can be used for planning and/or operations. We or transformer) g: generator d: load c: operating state; c = 0 indicates the no contingency state (steady- stateNovember 18, 2008 1 Abstract--In this paper, we analyze the N-1 reliable DC optimal dispatch

Ferris, Michael C.

332

Consortium for Electric Reliability Technology Solutions Grid of the Future White Paper on Review of Recent Reliability Issues and Systems Events  

SciTech Connect (OSTI)

This report is one of six reports developed under the U.S. Department of Energy (DOE) program in Power System Integration and Reliability (PSIR). The objective of this report is to review, analyze, and evaluate critical reliability issues demonstrated by recent disturbance events in the North America power system. Eleven major disturbances are examined, most occurring in this decade. The strategic challenge is that the pattern of technical need has persisted for a long period of time. For more than a decade, anticipation of market deregulation has been a major disincentive to new investments in system capacity. It has also inspired reduced maintenance of existing assets. A massive infusion of better technology is emerging as the final option to continue reliable electrical services. If an investment in better technology will not be made in a timely manner, then North America should plan its adjustments to a very different level of electrical service. It is apparent that technical operations staff among the utilities can be very effective at marshaling their forces in the immediate aftermath of a system emergency, and that serious disturbances often lead to improved mechanisms for coordinated operation. It is not at all apparent that such efforts can be sustained through voluntary reliability organizations in which utility personnel external to those organizations do most of the technical work. The eastern interconnection shows several situations in which much of the technical support has migrated from the utilities to the Independent System Operator (ISO), and the ISO staffs or shares staff with the regional reliability council. This process may be a natural and very positive consequence of utility restructuring. If so, the process should be expedited in regions where it is less advanced.

Hauer, John F.; Dagle, Jeffery E.

1999-12-01T23:59:59.000Z

333

Grid Reliability- An Electric Utility Company's Perspective  

Broader source: Energy.gov [DOE]

Presentationgiven at the Federal Utility Partnership Working Group (FUPWG) Fall 2008 meetingcovers Southern Company's business continuity, North American Electric Reliability Corporation (NERC) cybersecurity, and homeland security as well as physical recovery after a major outage, and five questions to ask your local utility.

334

Relatedness influences signal reliability in evolving robots  

E-Print Network [OSTI]

minute in an arena containing a food and a poison source that both emitted red light (figure 1). Robots could distinguish food and poison only at a very close range. The performance of robots was proportional related robots produced signals that reliably indicated the location of the food source and thereby

Floreano, Dario

335

New correlation calculates reliable paraffin solubilities  

SciTech Connect (OSTI)

A new correlation based on boiling point has been developed which accurately calculates paraffin solubilities in water. The correlation provides reliable solubility values down to very low concentrations (parts per million and less), for which the API correlation is not accurate. It can be used for initial engineering studies, including those involving health, safety, and environmental considerations.

Yaws, C.L.; Pan, X. (Lamar Univ., Beaumont, TX (US))

1991-04-08T23:59:59.000Z

336

Interval Analysis and Reliability in Robotics  

E-Print Network [OSTI]

be highly reliable (i.e. for a robot used in surgical applications). The sources of uncertainties will restrict ourself in this paper to industrial robot. These type of robots have a base that is attached the mechanism motion). There are two main classes of industrial robots mechani- cal architecture: serial

Paris-Sud XI, Université de

337

"Reliability, Resiliency, and Restoration for Smarter Grid  

E-Print Network [OSTI]

"Reliability, Resiliency, and Restoration for Smarter Grid Workshop" Save the Date April 3 and 4 at mohlsen@bnl.gov "The Resilient Smart Grid" to be held at Brookhaven National Laboratory Upton, Long Island://www.bnl.gov/maps/. This is the 5th workshop that BNL is hosting on the Smart Grid. This Workshop will build on the previous

Ohta, Shigemi

338

Reliable Link Maintenance in Cognitive Radio Systems  

E-Print Network [OSTI]

resources and overcome the under-utilization of licensed spectrum. Since the licensed user still keeps) have to vacate the spectrum in case the licensed user claims it. In order to maintain the qualityReliable Link Maintenance in Cognitive Radio Systems Daniel Willkomm, James Gross and Adam Wolisz

Gross, James

339

A hypothetical profile of ordinary steam turbines with reduced cost and enhanced reliability for contemporary conditions  

SciTech Connect (OSTI)

Power steam turbines should be characterized with the reduced cost and enhanced reliability and designed on the basis of experience in steam turbine design and operation accumulated in the world`s practice for the latest years. Currently, such turbines have to be particularly matched with requirements of operation for deregulated power systems; so they should be capable of operating in both base-load and cycling modes. It seems reasonable to have such turbines with the single capacity about 250--400 MW, supercritical main steam pressure, and single steam reheat. This makes it possible to design such turbines with the minimum specific metal amount and length, with the integrated HP-IP and one two-flow LP cylinders. With existing ferritic and martensitic-class steels, the main and reheat steam temperatures can be chosen at the level of 565--580 C (1050--1075 F) without remarkable supplemental expenditures and a sacrifice of reliability. To reduce the capital cost and simplify operation and maintenance, the turbine`s regenerative system can be designed deaeratorless with motor-driven boiler-feed pumps. Such turbines could be used to replace existing old turbines with minimum expenditures. They can also be combined with large high-temperature gas-turbine sets to shape highly efficient combined-cycle units. There exist various design and technological decisions to enhance the turbine reliability and efficiency; they are well worked up and verified in long-term operation practice of different countries. For reliable and efficient operation, the turbine should be furnished with advanced automatic and automated control, diagnostic monitoring, and informative support for the operational personnel.

Leyzerovich, A.S. [Actinium Corp., St. Louis, MO (United States)

1998-12-31T23:59:59.000Z

340

Comments on Emergency Order to Resume Limited Operation at the...  

Broader source: Energy.gov (indexed) [DOE]

regional, non-profit organization to work solely on decreasing the negative effects of global warming by promoting clean energy alternatives and ensuring proper regulation of...

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

DOE Orders Mirant Power Plant to Operate Under Limited Circumstances |  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of EnergyEnergyENERGYWomenthe HouseStudents2.2at MultipleorderNuclearThis fact sheetHeat Pump Models

342

DOE Orders Mirant Power Plant to Operate Under Limited Circumstances |  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of EnergyEnergyENERGYWomenthe HouseStudents2.2at MultipleorderNuclearThis fact sheetHeat Pump

343

Reliability-Based Decision Making: A Comparison of Statistical Approaches  

E-Print Network [OSTI]

Reliability-Based Decision Making: A Comparison of Statistical Approaches J. M. Aughenbaugh whose reliability is well established and a new component that has an unknown reliability. In some scenarios, the designer may have some initial beliefs about the new component's reliability. The designer

Herrmann, Jeffrey W.

344

ContentsContents4466Reliability and quality control  

E-Print Network [OSTI]

ContentsContents4466Reliability and quality control 1. Reliability 2. Quality Control Learning outcomes You will first learn about the importance of the concept of reliability applied to systems previous experience with certain mathematical topics this time may vary considerably. 1 #12;Reliability

Vickers, James

345

ORNL/TM-2004/91 MEASUREMENT PRACTICES FOR RELIABILITY  

E-Print Network [OSTI]

ORNL/TM-2004/91 MEASUREMENT PRACTICES FOR RELIABILITY AND POWER QUALITY A TOOLKIT OF RELIABILITY MEASUREMENT PRACTICES June 2004 #12;#12;ORNL/TM-2004/91 MEASUREMENT PRACTICES FOR RELIABILITY AND POWER QUALITY A TOOLKIT OF RELIABILITY MEASUREMENT PRACTICES John D. Kueck and Brendan J. Kirby Oak Ridge

Oak Ridge National Laboratory

346

Applications of the Cross-Entropy Method in Reliability  

E-Print Network [OSTI]

Applications of the Cross-Entropy Method in Reliability Dirk P. Kroese and Kin-Ping Hui University and components that are all sub- ject to failure. Reliability theory studies the failure behavior of such sys, even for the most basic reliability models, the overall reliability of the system can be difficult

Kroese, Dirk P.

347

Security-Constrained Adequacy Evaluation of Bulk Power System Reliability  

E-Print Network [OSTI]

Security-Constrained Adequacy Evaluation of Bulk Power System Reliability Fang Yang, Student Member contingency selection, (b) effects analysis, and (c) reliability index computation. Effects analysis and reliability index computations. The methodology is demonstrated with the IEEE reliability test system. Index

348

Reliability and Validity: One Factor and Third Factor Tests  

E-Print Network [OSTI]

Chapter 7 Reliability and Validity: One Factor and Third Factor Tests D. White and A. Korotayev 26 Sept 2003 Html links are live Reliability and validity are crucial issues in research. Reliability may have high validity but low reliability, in which case its correlations with other high validity

White, Douglas R.

349

A Hierarchical Model for Estimating the Reliability of Complex Systems  

E-Print Network [OSTI]

an approximation to the joint posterior distribution on the total system reliability was obtained. Many reliability or bounding moments of the system reliability posterior distribution (Cole (1975), Mastran (1976), DostalA Hierarchical Model for Estimating the Reliability of Complex Systems Valen E. Johnson, Todd L

Reese, Shane

350

Improving Work Flow Reliability Proceedings IGLC-7 275  

E-Print Network [OSTI]

Ballard1 ABSTRACT Improving work flow reliability is important for the productivity of linked productionImproving Work Flow Reliability Proceedings IGLC-7 275 IMPROVING WORK FLOW RELIABILITY Glenn units, and consequently for project cost and duration. One measure of work flow reliability is PPC

Tommelein, Iris D.

351

Nondestructive examination (NDE) reliability for inservice inspection of light waters reactors  

SciTech Connect (OSTI)

Evaluation and Improvement of NDE Reliability for Inservice Inspection of Light Water Reactors (NDE Reliability) Program at the Pacific Northwest Laboratory was established by the Nuclear Regulatory Commission to determine the reliability of current inservice inspection (ISI) techniques and to develop recommendations that will ensure a suitably high inspection reliability. The objectives of this program include determining the reliability of ISI performed on the primary systems of commercial light-water reactors (LWRs); using probabilistic fracture mechanics analysis to determine the impact of NDE unreliability on system safety; and evaluating reliability improvements that can be achieved with improved and advanced technology. A final objective is to formulate recommended revisions to ASME Code and Regulatory requirements, based on material properties, service conditions, and NDE uncertainties. The program scope is limited to ISI of the primary systems including the piping, vessel, and other inspected components. This is a progress report covering the programmatic work from April 1988 through September 1988. 33 refs., 70 figs., 12 tabs.

Doctor, S.R.; Deffenbaugh, J.D.; Good, M.S.; Green, E.R.; Heasler, P.G.; Simonen, F.A.; Spanner, J.C.; Taylor, T.T. (Pacific Northwest Lab., Richland, WA (USA))

1989-11-01T23:59:59.000Z

352

Techniques to evaluate the importance of common cause degradation on reliability and safety of nuclear weapons.  

SciTech Connect (OSTI)

As the nuclear weapon stockpile ages, there is increased concern about common degradation ultimately leading to common cause failure of multiple weapons that could significantly impact reliability or safety. Current acceptable limits for the reliability and safety of a weapon are based on upper limits on the probability of failure of an individual item, assuming that failures among items are independent. We expanded the current acceptable limits to apply to situations with common cause failure. Then, we developed a simple screening process to quickly assess the importance of observed common degradation for both reliability and safety to determine if further action is necessary. The screening process conservatively assumes that common degradation is common cause failure. For a population with between 100 and 5000 items we applied the screening process and conclude the following. In general, for a reliability requirement specified in the Military Characteristics (MCs) for a specific weapon system, common degradation is of concern if more than 100(1-x)% of the weapons are susceptible to common degradation, where x is the required reliability expressed as a fraction. Common degradation is of concern for the safety of a weapon subsystem if more than 0.1% of the population is susceptible to common degradation. Common degradation is of concern for the safety of a weapon component or overall weapon system if two or more components/weapons in the population are susceptible to degradation. Finally, we developed a technique for detailed evaluation of common degradation leading to common cause failure for situations that are determined to be of concern using the screening process. The detailed evaluation requires that best estimates of common cause and independent failure probabilities be produced. Using these techniques, observed common degradation can be evaluated for effects on reliability and safety.

Darby, John L.

2011-05-01T23:59:59.000Z

353

Real-time Pricing Demand Response in Operations  

SciTech Connect (OSTI)

AbstractDynamic pricing schemes have been implemented in commercial and industrial application settings, and recently they are getting attention for application to residential customers. Time-of-use and critical-peak-pricing rates are in place in various regions and are being piloted in many more. These programs are proving themselves useful for balancing energy during peak periods; however, real-time (5 minute) pricing signals combined with automation in end-use systems have the potential to deliver even more benefits to operators and consumers. Besides system peak shaving, a real-time pricing system can contribute demand response based on the locational marginal price of electricity, reduce load in response to a generator outage, and respond to local distribution system capacity limiting situations. The US Department of Energy (DOE) is teaming with a mid-west electricity service provider to run a distribution feeder-based retail electricity market that negotiates with residential automation equipment and clears every 5 minutes, thus providing a signal for lowering or raising electric consumption based on operational objectives of economic efficiency and reliability. This paper outlines the capability of the real-time pricing system and the operational scenarios being tested as the system is rolled-out starting in the first half of 2012.

Widergren, Steven E.; Marinovici, Maria C.; Berliner, Teri; Graves, Alan

2012-07-26T23:59:59.000Z

354

1987 DOE review: First collider run operation  

SciTech Connect (OSTI)

This review covers the operations of the first run of the 1.8 TeV superconducting super collider. The papers enclosed cover: PBAR source status, fixed target operation, Tevatron cryogenic reliability and capacity upgrade, Tevatron Energy upgrade progress and plans, status of the D0 low beta insertion, 1.8 K and 4.7 K refrigeration for low-..beta.. quadrupoles, progress and plans for the LINAC and booster, near term and long term and long term performance improvements.

Childress, S.; Crawford, J.; Dugan, G.; Edwards, H.; Finley, D.A.; Fowler, W.B.; Harrison, M.; Holmes, S.; Makara, J.N.; Malamud, E.

1987-05-01T23:59:59.000Z

355

IEEE TRANSACTIONS ON RELIABILITY, VOL. 54, NO. 3, SEPTEMBER 2005 475 Quality-Reliability Chain Modeling for  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON RELIABILITY, VOL. 54, NO. 3, SEPTEMBER 2005 475 Quality-Reliability Chain Modeling for System-Reliability Analysis of Complex Manufacturing Processes Yong Chen and Jionghua Jin Abstract--System reliability of a manufacturing process should address effects of both the manufacturing

Jin, Jionghua "Judy"

356

Beyond Corridor Reliability Measures: Analysis of Freeway Travel Time Reliability at the1 Segment Level for Hotspot Identification2  

E-Print Network [OSTI]

Beyond Corridor Reliability Measures: Analysis of Freeway Travel Time Reliability at the1 Segment and particularly1 freeways. However, it has become evident that travel time reliability, taking into account at the directional corridor level for planning4 purposes and analyze the ways in which travel time reliability can

Bertini, Robert L.

357

Report to Congress on stockpile reliability, weapon remanufacture, and the role of nuclear testing  

SciTech Connect (OSTI)

This report analyzes two issues: (1) ''whether past warhead reliability problems demonstrate that nuclear explosive testing is needed to identify or to correct stockpile reliability,'' or (2) ''whether a program of stockpile inspection, nonnuclear testing, and remanufacture would be sufficient to deal with stockpile reliability problems.'' Chapter 1 examines the reasons for nuclear testing. Although the thrust of the request from Congressman Aspin et al., has to do with the need for nuclear testing as it relates to stockpile reliability and remanufacture, there are other very important reasons for nuclear testing. Since there has been increasing interest in the US Congress for more restrictive nuclear test limits, we have addressed the overall need for nuclear testing and the potential impact of further nuclear test limitations. Chapter 1 also summarizes the major conclusions of a recent study conducted by the Scientific and Academic Advisory Committee (SAAC) for the President of the University of California; the SAAC report is entitled, ''Nuclear Weapon Tests: The Role of the University of California-Department of Energy Laboratories.'' Chapter 2 presents a brief history of stockpile problems that involved post-deployment nuclear testing for their resolution. Chapter 3 addresses the problems involved in remanufacturing nuclear weapons, and Chapter 4 discusses measures that should be taken to prepare for possible future restrictive test limits.

Miller, G.H.; Brown, P.S.; Alonso, C.T.

1987-10-01T23:59:59.000Z

358

A study of the performance and reliability of microprocessor based controls  

SciTech Connect (OSTI)

The microprocessor based distribution feeder protection unit is designed for the protection of radial feeders. Since the recloser is one of the most important normal and emergency controllers, it must retain its normal basic operations such as fault detection, timing, and fault interruption under adverse operating environments to provide complete protection and reliability needed by the distribution system. In view of the importance of this recloser to the security and reliable operation of the distribution system, it must undergo rigorous laboratory, environmental and electromagnetic interference (EMI) and field tests before installation is contemplated. To achieve these objectives, a test current from the feeder simulator was applied to the controller and was observed as it stepped through its sequence of tripping and reclosing.

Teshome, A.; Aitken, M.W.

1995-12-31T23:59:59.000Z

359

A RAM (Reliability Availability Maintainability) analysis of Consolidated Edison's Gowanus and Narrows gas turbine power plants  

SciTech Connect (OSTI)

A methodology is presented which accurately assesses the ability of gas turbine generating stations to perform their intended function (reliability) while operating in a peaking duty mode. The developed methodology alloys the RAM modeler to calculate the probability that a peaking unit will produce the energy demanded and in turn calculate the total energy lost during a given time period due to unavailability of individual components. The methodology was applied to Consolidated Edison's Narrows site which has 16 barge-mounted General Electric Frame 5 gas turbines operating under a peaking duty mode. The resulting RAM model was quantified using the Narrows site power demand and failure rate data. The model was also quantified using generic failure data from the Operational Reliability Analysis Program (ORAP) for General Electric Frame 5 peaking gas turbines. A problem description list and counter measures are offered for components contributing more than one percent to gas turbine energy loss. 3 refs., 18 figs., 12 tabs.

Johnson, B.W.; Whitehead, T.J.; Derenthal, P.J. (Science Applications International Corp., Los Altos, CA (USA))

1990-12-01T23:59:59.000Z

360

IDHEAS A NEW APPROACH FOR HUMAN RELIABILITY ANALYSIS  

SciTech Connect (OSTI)

This paper describes a method, IDHEAS (Integrated Decision-Tree Human Event Analysis System) that has been developed jointly by the US NRC and EPRI as an improved approach to Human Reliability Analysis (HRA) that is based on an understanding of the cognitive mechanisms and performance influencing factors (PIFs) that affect operator responses. The paper describes the various elements of the method, namely the performance of a detailed cognitive task analysis that is documented in a crew response tree (CRT), and the development of the associated time-line to identify the critical tasks, i.e. those whose failure results in a human failure event (HFE), and an approach to quantification that is based on explanations of why the HFE might occur.

G. W. Parry; J.A Forester; V.N. Dang; S. M. L. Hendrickson; M. Presley; E. Lois; J. Xing

2013-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

A High Reliability Gas-driven Helium Cryogenic Centrifugal Compressor  

E-Print Network [OSTI]

A helium cryogenic compressor was developed and tested in real conditions in 1996. The achieved objective was to compress 0.018 kg/s Helium at 4 K @ 1000 Pa (10 mbar) up to 3000 Pa (30 mbar). This project was an opportunity to develop and test an interesting new concept in view of future needs. The main features of this new specific technology are described. Particular attention is paid to the gas bearing supported rotor and to the pneumatic driver. Trade off between existing technologies and the present work are presented with special stress on the bearing system and the driver. The advantages are discussed, essentially focused on life time and high reliability without maintenance as well as non pollution characteristic. Practical operational modes are also described together with the experimental performances of the compressor. The article concludes with a brief outlook of future work.

Bonneton, M; Gistau-Baguer, Guy M; Turcat, F; Viennot, P

1998-01-01T23:59:59.000Z

362

Puget Sound Area Electric Reliability Plan : Final Environmental Impact Statement.  

SciTech Connect (OSTI)

A specific need exists in the Puget Sound area for balance between east-west transmission capacity and the increasing demand to import power generated east of the Cascades. At certain times of the year, and during certain conditions, there is more demand for power in the Puget Sound area than the transmission system and existing generation can reliably supply. This high demand, called peak demand occurs during the winter months when unusually cold weather increases electricity use for heating. The existing power system can supply enough power if no emergencies occur. However, during emergencies the system will not operate properly. As demand grows, the system becomes more strained. To meet demand, the rate of growth of demand must be reduced or the ability to serve the demand must be increased, or both.

United States. Bonneville Power Administration.

1992-04-01T23:59:59.000Z

363

Operation Poorman  

SciTech Connect (OSTI)

The objectives of Operation Poorman were to design and build a portable seismic system and to set up and use this system in a cold-weather environment. The equipment design uses current technology to achieve a low-power, lightweight system that is configured into three modules. The system was deployed in Alaska during wintertime, and the results provide a basis for specifying a mission-ready seismic verification system.

Pruvost, N.; Tsitouras, J.

1981-03-18T23:59:59.000Z

364

Operations Videos  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas Conchas recoveryLaboratorySpeeding access1 TechnicalOilOnlineandOperations

365

The concepts of leak before break and absolute reliability of NPP equipment and piping  

SciTech Connect (OSTI)

This paper describes the absolute reliability (AR) concept for ensuring safe operation of nuclear plant equipment and piping. The AR of a pipeline or component is defined as the level of reliability when the probability of an instantaneous double-ended break is near zero. AR analysis has been applied to Russian RBMK and VVER type reactors. It is proposed that analyses required for application of the leak before break concept should be included in AR implementation. The basic principles, methods, and approaches that provide the basis for implementing the AR concept are described.

Getman, A.F.; Komarov, O.V.; Sokov, L.M. [and others

1997-04-01T23:59:59.000Z

366

Smart Grid - Transforming Power System Operations  

SciTech Connect (OSTI)

AbstractElectric power systems are entering a new realm of operations. Large amounts of variable generation tax our ability to reliably operate the system. Couple this with a greater reliance on the electricity network to serve consumer demand that is likely to rise significantly even as we drive for greater efficiency. Trade-offs between energy and environmental needs will be constantly negotiated, while a reliable supply of electricity needs even greater assurance in a world where threats of disruption have risen. Smart grid capabilities are being proposed to help address the challenges confronting system operations. This paper reviews the impact of smart grid functionality on transforming power system operations. It explores models for distributed energy resources (DER generation, storage, and load) that are appearing on the system. It reviews the evolving nature of electricity markets to deal with this complexity and a change of emphasis on signals from these markets to affect power system control. Smart grid capabilities will also impact reliable operations, while cyber security issues must be addressed as a culture change that influences all system design, implementation, and maintenance. Lastly, the paper explores significant questions for further research and the need for a simulation environment that supports such investigation and informs deployments to mitigate operational issues as they arise.

Widergren, Steven E.; Kirkham, Harold

2010-04-28T23:59:59.000Z

367

Structural Reliability: Assessing the Condition and Reliability of Casing in Compacting Reservoirs  

E-Print Network [OSTI]

. Effective stress may exceed rock compressive strength, inducing compaction. Wells in compacting reservoirs risk high failure and deformation rates. This project introduces the concept of structural reliability to quantify casing failure risks in compacting...

Chantose, Prasongsit

2012-02-14T23:59:59.000Z

368

Electronic logic for enhanced switch reliability  

DOE Patents [OSTI]

A logic circuit is used to enhance redundant switch reliability. Two or more switches are monitored for logical high or low output. The output for the logic circuit produces a redundant and fail-safe representation of the switch outputs. When both switch outputs are high, the output is high. Similarly, when both switch outputs are low, the logic circuit's output is low. When the output states of the two switches do not agree, the circuit resolves the conflict by memorizing the last output state which both switches were simultaneously in and produces the logical complement of this output state. Thus, the logic circuit of the present invention allows the redundant switches to be treated as if they were in parallel when the switches are open and as if they were in series when the switches are closed. A failsafe system having maximum reliability is thereby produced.

Cooper, J.A.

1984-01-20T23:59:59.000Z

369

The Lightswitch Wizard -- reliable daylight simulations  

E-Print Network [OSTI]

A web-based, non-expert daylighting analysis tool has been developed to support daylighting-related design decisions in peripheral private offices during an early design stage (http://buildwiz.com). The tool offers a comparative, reliable, and fast analysis of the annual amount of daylight in the offices (daylight factor and daylight autonomy) and the lighting energy performance of automated lighting controls (occupancy sensors, photocells) compared to standard on/off switches. Blinds are either manually or automatically controlled.

For Initial Design; C. F. Morrison; M. Dubrous; C. F. Reinhart ?; M. Morrison; F. Dubrous

370

Sandia National Laboratories: photovoltaic plant reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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371

Reliable Power Inc | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to: navigation, searchVirginia Blue Ridge And Piedmont Provinces |Rehobeth,Reliable Power Inc

372

Operational health physics training  

SciTech Connect (OSTI)

The initial four sections treat basic information concerning atomic structure and other useful physical quantities, natural radioactivity, the properties of {alpha}, {beta}, {gamma}, x rays and neutrons, and the concepts and units of radiation dosimetry (including SI units). Section 5 deals with biological effects and the risks associated with radiation exposure. Background radiation and man-made sources are discussed next. The basic recommendations of the ICRP concerning dose limitations: justification, optimization (ALARA concepts and applications) and dose limits are covered in Section seven. Section eight is an expanded version of shielding, and the internal dosimetry discussion has been extensively revised to reflect the concepts contained in the MIRD methodology and ICRP 30. The remaining sections discuss the operational health physics approach to monitoring radiation. Individual sections include radiation detection principles, instrument operation and counting statistics, health physics instruments and personnel monitoring devices. The last five sections deal with the nature of, operation principles of, health physics aspects of, and monitoring approaches to air sampling, reactors, nuclear safety, gloveboxes and hot cells, accelerators and x ray sources. Decontamination, waste disposal and transportation of radionuclides are added topics. Several appendices containing constants, symbols, selected mathematical topics, and the Chart of the Nuclides, and an index have been included.

NONE

1992-06-01T23:59:59.000Z

373

Apply early! Limited enrollment.  

E-Print Network [OSTI]

volcano. Experience the culture and history of Hawaii, and the impact of human activitiesApply early! Limited enrollment. Environmental Science in the Hawaiian Islands Observe, research

374

Operations Information  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - September 2006 The 2002 WholesaleEnergy'sRunning jobsOPERATING PLANOperations

375

The Reliability of Triage Classification as a Predictor of Severity in Major Trauma  

E-Print Network [OSTI]

egional A bstracts The Reliability of Triage Classificationbe undertaken to validate its reliability and consideration

Moreno-Walton, Lisa; Torres, Hector; Radeos, Michael

2007-01-01T23:59:59.000Z

376

Systematic Comparison of Operating Reserve Methodologies: Preprint  

SciTech Connect (OSTI)

Operating reserve requirements are a key component of modern power systems, and they contribute to maintaining reliable operations with minimum economic impact. No universal method exists for determining reserve requirements, thus there is a need for a thorough study and performance comparison of the different existing methodologies. Increasing penetrations of variable generation (VG) on electric power systems are posed to increase system uncertainty and variability, thus the need for additional reserve also increases. This paper presents background information on operating reserve and its relationship to VG. A consistent comparison of three methodologies to calculate regulating and flexibility reserve in systems with VG is performed.

Ibanez, E.; Krad, I.; Ela, E.

2014-04-01T23:59:59.000Z

377

Reliability assessment of a 1 MV LTD.  

SciTech Connect (OSTI)

A 1 MV linear transformer driver (LTD) is being tested with a large area e-beam diode load at Sandia National Laboratories (SNL). The experiments will be utilized to determine the repeatability of the output pulse and the reliability of the components. The 1 MV accelerator is being used to determine the feasibility of designing a 6 MV LTD for radiography experiments. The peak voltage, risetime, and pulse width as well as the cavity timing jitter are analyzed to determine the repeatability of the output pulse.

Portillo, Salvador; Chavez, Raymond (Ktech Corporation, Albuquerque, NM); Molina, Isidro; Kim, Alexandre A. (High Current Electronics Institute, Tomsk, Russia); Johnson, David L. (Titan Pulsed Sciences Division, San Leandro, CA); Maenchen, John Eric; Leckbee, Joshua J.; Ziska, Derek Raymond (Ktech Corporation, Albuquerque, NM)

2005-07-01T23:59:59.000Z

378

Final report on reliability and lifetime prediction.  

SciTech Connect (OSTI)

This document highlights the important results obtained from the subtask of the Goodyear CRADA devoted to better understanding reliability of tires and to developing better lifetime prediction methods. The overall objective was to establish the chemical and physical basis for the degradation of tires using standard as well as unique models and experimental techniques. Of particular interest was the potential application of our unique modulus profiling apparatus for assessing tire properties and for following tire degradation. During the course of this complex investigation, extensive relevant information was generated, including experimental results, data analyses and development of models and instruments. Detailed descriptions of the findings are included in this report.

Gillen, Kenneth Todd; Wise, Jonathan; Jones, Gary D.; Causa, Al G. [Goodyear Tire and Rubber Co., Akron, OH; Terrill, Edward R. [Goodyear Tire and Rubber Co., Akron, OH; Borowczak, Marc [Goodyear Tire and Rubber Co., Akron, OH

2012-12-01T23:59:59.000Z

379

Accuracy and reliability of China's energy statistics  

SciTech Connect (OSTI)

Many observers have raised doubts about the accuracy and reliability of China's energy statistics, which show an unprecedented decline in recent years, while reported economic growth has remained strong. This paper explores the internal consistency of China's energy statistics from 1990 to 2000, coverage and reporting issues, and the state of the statistical reporting system. Available information suggests that, while energy statistics were probably relatively good in the early 1990s, their quality has declined since the mid-1990s. China's energy statistics should be treated as a starting point for analysis, and explicit judgments regarding ranges of uncertainty should accompany any conclusions.

Sinton, Jonathan E.

2001-09-14T23:59:59.000Z

380

Reliability Technology earns prestigious Los Alamos award  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive Solar HomePromising ScienceRecentRegionalReliability Technology earns award

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Granite Reliable Power | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth's Heat Jump to:Photon Place: Golden, COIndiana Jump to:Grand RidgeReliable Power

382

Sandia National Laboratories: Blade Reliability Collaborative  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -the Mid-Infrared0Energy Advanced NuclearBASF latentBiofuelsBiomassReliability

383

Sandia National Laboratories: Blade Reliability Collaborative  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -the Mid-Infrared0Energy Advanced NuclearBASF latentBiofuelsBiomassReliabilityBlade

384

Sandia National Laboratories: Inverter Reliability Program  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLS Exhibit atVehicleEnergyPolydotsMicroReliability

385

Reliable, Economic, Efficient CO2 Heat Pump Water Heater for North America  

SciTech Connect (OSTI)

Adoption of heat pump water heating technology for commercial hot water could save up to 0.4 quads of energy and 5 million metric tons of CO2 production annually in North America, but industry perception is that this technology does not offer adequate performance or reliability and comes at too high of a cost. Development and demonstration of a CO2 heat pump water heater is proposed to reduce these barriers to adoption. Three major themes are addressed: market analysis to understand barriers to adoption, use of advanced reliability models to design optimum qualification test plans, and field testing of two phases of water heater prototypes. Market experts claim that beyond good performance, market adoption requires 'drop and forget' system reliability and a six month payback of first costs. Performance, reliability and cost targets are determined and reliability models are developed to evaluate the minimum testing required to meet reliability targets. Three phase 1 prototypes are designed and installed in the field. Based on results from these trials a product specification is developed and a second phase of five field trial units are built and installed. These eight units accumulate 11 unit-years of service including 15,650 hours and 25,242 cycles of compressor operation. Performance targets can be met. An availability of 60% is achieved and the capability to achieve >90% is demonstrated, but overall reliability is below target, with an average of 3.6 failures/unit-year on the phase 2 demonstration. Most reliability issues are shown to be common to new HVAC products, giving high confidence in mature product reliability, but the need for further work to minimize leaks and ensure reliability of the electronic expansion valve is clear. First cost is projected to be above target, leading to an expectation of 8-24 month payback when substituted for an electric water heater. Despite not meeting all targets, arguments are made that an industry leader could sufficiently develop this technology to impact the water heater market in the near term.

Radcliff, Thomas D; Sienel, Tobias; Huff, Hans-Joachim; Thompson, Adrian; Sadegh, Payman; Olsommer, Benoit; Park, Young

2006-12-31T23:59:59.000Z

386

Ensuring the Availability and Reliability of Urea Dosing For...  

Broader source: Energy.gov (indexed) [DOE]

Ensuring the Availability and Reliability of Urea Dosing For On-Road and Non-Road Ensuring the Availability and Reliability of Urea Dosing For On-Road and Non-Road 2003 DEER...

387

Energy Department Invests Over $10 Million to Improve Grid Reliability...  

Broader source: Energy.gov (indexed) [DOE]

Over 10 Million to Improve Grid Reliability and Resiliency Energy Department Invests Over 10 Million to Improve Grid Reliability and Resiliency June 11, 2014 - 6:20pm Addthis...

388

Bus supervision deployment strategies for improved bus service reliability  

E-Print Network [OSTI]

Bus service reliability has always been a top concern for transit agencies and their customers. Unfortunately, there are several factors detrimental to reliable bus service. Outside influences such as weather, traffic, and ...

Pangilinan, Christopher Allan

2006-01-01T23:59:59.000Z

389

Reliability characterization and prediction of high k dielectric thin film  

E-Print Network [OSTI]

As technologies continue advancing, semiconductor devices with dimensions in nanometers have entered all spheres of human life. This research deals with both the statistical aspect of reliability and some electrical aspect of reliability...

Luo, Wen

2006-04-12T23:59:59.000Z

390

Implications of reliability in mechanistic/empirical pavement design applications  

E-Print Network [OSTI]

to engineering is that; reliability is the probability that an engineered system will perform its required function adequately for a specified period of time under the stated conditions. Reliability is important because of the uncertainty involved...

Killingsworth, Brian Mark

1994-01-01T23:59:59.000Z

391

Wind Power Reliability: Breaking Down a Barrier | Department...  

Broader source: Energy.gov (indexed) [DOE]

Wind Power Reliability: Breaking Down a Barrier Wind Power Reliability: Breaking Down a Barrier June 25, 2010 - 12:16pm Addthis EnerNex Corporation is developing documentation and...

392

Gearbox Reliability Collaborative - Phase 1 and 2 Overview (Presentation)  

SciTech Connect (OSTI)

The presentation given at the Wind Turbine Reliability Workshop at Sandia National Laboratories, August 2-3, 2011, serves as an overview for the findings from the Gearbox Reliability Collaborative Project Report: Findings from Phase 1 and Phase 2 Testing

Link, H.

2011-08-01T23:59:59.000Z

393

Designing CPV Receivers With Reliability: Early Evaluation of Components  

E-Print Network [OSTI]

. Everett, A. Blakers Centre for Sustainable Energy Systems, The Australian National University, Canberra: Early detection of performance issues allows more rapid & reliable design optimisation. Thermal. Ultra light-weight Fresnel mirror enclosed system. DESIGN RELIABILITY PRODUCTION Early detection

394

Optical limiting materials  

DOE Patents [OSTI]

Optical limiting materials. Methanofullerenes, fulleroids and/or other fullerenes chemically altered for enhanced solubility, in liquid solution, and in solid blends with transparent glass (SiO.sub.2) gels or polymers, or semiconducting (conjugated) polymers, are shown to be useful as optical limiters (optical surge protectors). The nonlinear absorption is tunable such that the energy transmitted through such blends saturates at high input energy per pulse over a wide range of wavelengths from 400-1100 nm by selecting the host material for its absorption wavelength and ability to transfer the absorbed energy into the optical limiting composition dissolved therein. This phenomenon should be generalizable to other compositions than substituted fullerenes.

McBranch, Duncan W. (Santa Fe, NM); Mattes, Benjamin R. (Santa Fe, NM); Koskelo, Aaron C. (Los Alamos, NM); Heeger, Alan J. (Santa Barbara, CA); Robinson, Jeanne M. (Los Alamos, NM); Smilowitz, Laura B. (Los Alamos, NM); Klimov, Victor I. (Los Alamos, NM); Cha, Myoungsik (Goleta, CA); Sariciftci, N. Serdar (Santa Barbara, CA); Hummelen, Jan C. (Groningen, NL)

1998-01-01T23:59:59.000Z

395

Measurement and self-adjoint operators  

E-Print Network [OSTI]

The approximations of classical mechanics resulting from quantum mechanics are richer than a correspondence of classical dynamical variables with self-adjoint Hilbert space operators. Assertion that classical dynamic variables correspond to self-adjoint Hilbert space operators is disputable and sets unnatural limits on quantum mechanics. Well known examples of classical dynamical variables not associated with self-adjoint Hilbert space operators are discussed as a motivation for the realizations of quantum field theory that lack Hermitian field operators but exhibit interaction.

Glenn Eric Johnson

2014-09-05T23:59:59.000Z

396

Synchronization of Limit Sets  

E-Print Network [OSTI]

In this Letter, we derive a sufficient condition of synchronizing limit sets (attractors and repellers) by using the linear feedback control technique proposed here. There examples are included. The numerical simulations and computer graphics show that our method work well.

Changpin Li; Weihua Deng

2005-10-10T23:59:59.000Z

397

Photovoltaic Module Reliability Workshop 2010: February 18-19, 2010  

SciTech Connect (OSTI)

NREL's Photovoltaic (PV) Module Reliability Workshop (PVMRW) brings together PV reliability experts to share information, leading to the improvement of PV module reliability. Such improvement reduces the cost of solar electricity and promotes investor confidence in the technology--both critical goals for moving PV technologies deeper into the electricity marketplace.

Kurtz, J.

2013-11-01T23:59:59.000Z

398

Photovoltaic Module Reliability Workshop 2014: February 25-26, 2014  

SciTech Connect (OSTI)

NREL's Photovoltaic (PV) Module Reliability Workshop (PVMRW) brings together PV reliability experts to share information, leading to the improvement of PV module reliability. Such improvement reduces the cost of solar electricity and promotes investor confidence in the technology--both critical goals for moving PV technologies deeper into the electricity marketplace.

Kurtz, S.

2014-02-01T23:59:59.000Z

399

GENETIC ALGORITHM DESIGN OF NETWORKS CONSIDERING ALL-TERMINAL RELIABILITY  

E-Print Network [OSTI]

GENETIC ALGORITHM DESIGN OF NETWORKS CONSIDERING ALL-TERMINAL RELIABILITY Berna Dengiz and Fulya. The reliability and the cost of these systems are important considerations that are largely determined to solve the all-terminal network design problem when considering cost and reliability. The GA

Smith, Alice E.

400

Reliability, Sufficiency, and the Decomposition of Proper Scores  

E-Print Network [OSTI]

Reliability, Sufficiency, and the Decomposition of Proper Scores Jochen Br¨ocker October 23, 2009 scoring rules allow for a decomposition into terms related to the resolution and to the reliability to forecasts for finite­valued targets. Both resolution and reliability are shown to have a positive effect

Bröcker, Jochen

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Reliability-Constrained Latent Structure Peter Westfall and Kevin Henning  

E-Print Network [OSTI]

Reliability-Constrained Latent Structure Models Peter Westfall and Kevin Henning Texas Tech allow you to estimate reliability of your measure of the fuzzy concept · LSMs allow you to estimate cannot identify reliability. · LSMs cannot identify relationships between fuzzy concepts. · LSMs cannot

Westfall, Peter H.

402

Optimal Link Assignments for All-Terminal Network Reliability  

E-Print Network [OSTI]

Optimal Link Assignments for All-Terminal Network Reliability Constantine Stivaros Computer Science are subject to failure have been exten- sively studied in the literature. Their reliability is regarded reliability measure, defined as the probability that the network remains connected after failures. Previous

Sutner, Klaus

403

BAYESIAN RELIABILITY MODELING FOR MASKED SYSTEM LIFETIME DATA  

E-Print Network [OSTI]

BAYESIAN RELIABILITY MODELING FOR MASKED SYSTEM LIFETIME DATA Lynn KUO \\Lambda Department to fail. The objective is to make inferences for the reliability of the components. In this paper we Title: Reliability Inference for Masked System Lifetime Data. 1. Introduction In the masked system

Kuo, Lynn

404

On the reliability of seasonal forecasts Antje Weisheimer  

E-Print Network [OSTI]

On the reliability of seasonal forecasts Antje Weisheimer Weisheimer to achieving a "5"? à Use reliability of non-climatological forecastsDon: · if (X) C(X) à climatological (reliable) informaDon · if (X) C(X) à

Stevenson, Paul

405

Ecient Reliability Modeling and Analysis of Telecommunication Networks  

E-Print Network [OSTI]

E?cient Reliability Modeling and Analysis of Telecommunication Networks #3; L#19;aszl#19;o Jereb approach which is based on a simple two-state reliability model of the network elements taking into account implemented in the network. Using these information the network performance-reliability indexes including

László, Jereb

406

Reliability-Centric High-Level Synthesis , N. Mansouri  

E-Print Network [OSTI]

1 Reliability-Centric High-Level Synthesis S. Tosun , N. Mansouri , E. Arvas , M. Kandemir-down. As a result, it is becoming necessary to treat reliability as a first-class citizen in system design. In particular, reliability decisions taken early in system design can have significant benefits in terms

Paris-Sud XI, Université de

407

Reliability Analysis of Deduplicated and Erasure-Coded Storage  

E-Print Network [OSTI]

Reliability Analysis of Deduplicated and Erasure-Coded Storage Xiaozhou Li Mark Lillibridge Hewlett Avenue Palo Alto, CA muysal@vmware.com ABSTRACT Space efficiency and data reliability are two primary, deduplication affects data reliability because an object's constituent chunks are often spread across a large

Lillibridge, Mark

408

Reliability Gain of Network Coding in Lossy Wireless Networks  

E-Print Network [OSTI]

Reliability Gain of Network Coding in Lossy Wireless Networks Majid Ghaderi Department of Computer that network coding improves network reliability by reducing the number of packet retransmissions in lossy networks. However, the extent of the reliability benefit of network coding is not known. This paper

Massachusetts at Amherst, University of

409

Network Reliability Optimization via the Cross-Entropy Method  

E-Print Network [OSTI]

1 Network Reliability Optimization via the Cross-Entropy Method Dirk P. Kroese, Kin-Ping Hui and reliability. Given a fixed budget, which links should be purchased in order to maximize the system's reliability? We introduce a new approach, based on the Cross-Entropy method, which can deal effectively

Kroese, Dirk P.

410

Exploring Reliability for Automatic Identity Verification with Statistical Shape Models  

E-Print Network [OSTI]

Exploring Reliability for Automatic Identity Verification with Statistical Shape Models Federico M reliability measure of the result. In fact, the segmentation process is One ofthe drawbacks ofstatistical to a wrong result [4]. generic reliability measure for statistical shape models. It This problem

Frangi, Alejandro

411

Bayesian Networks and Evidence Theory to Model Complex Systems Reliability  

E-Print Network [OSTI]

Bayesian Networks and Evidence Theory to Model Complex Systems Reliability Ch. SIMON, Ph. WEBER, E.levrat}@cran.uhp-nancy.fr Abstract-- This paper deals with the use of Bayesian Net- works to compute system reliability of complex systems un- der epistemic uncertainty. In the context of incompleteness of reliability data

Paris-Sud XI, Université de

412

Reliability of Heterogeneous Distributed Computing Systems in the Presence  

E-Print Network [OSTI]

Reliability of Heterogeneous Distributed Computing Systems in the Presence of Correlated Failures Jorge E. Pezoa, Member, IEEE and Majeed M. Hayat, Fellow, IEEE Abstract--While the reliability) fail independently, the impact of correlated failures of CEs on the reliability remains an open

Hayat, Majeed M.

413

CSCI 668: Reliability MWF 11:0011:50 Jones 302  

E-Print Network [OSTI]

CSCI 668: Reliability Fall, 2012 MWF 11:00­11:50 Jones 302 Instructor: Larry Leemis Office: Jones Purpose: This course introduces probabilistic models and statistical methods used in reliability reliability theory at the level of the current archival literature. This semester, you will read articles from

Leemis, Larry

414

Reliability: The Other Dimension of Quality William Q. Meeker  

E-Print Network [OSTI]

Reliability: The Other Dimension of Quality William Q. Meeker Department of Statistics Iowa State extension of the revolution in product quality is to turn focus to product reliability, which is defined the relationship between engineering quality and reliability and outline the role of statistics and statisticians

415

"Reliability Inference Based on Multistate and Degradation Models"  

E-Print Network [OSTI]

"Reliability Inference Based on Multistate and Degradation Models" Vijay Nair Department of Georgia Department of Statistics Colloquium Series Reliability or survival analysis is traditionally based on time-to-failure data. In high- reliability applications, there is usually a high degree of censoring

Arnold, Jonathan

416

Reliability Tradeoffs in Personal Storage Systems John A. Chandy  

E-Print Network [OSTI]

Reliability Tradeoffs in Personal Storage Systems John A. Chandy john.chandy@uconn.edu Sumit ABSTRACT RAID has long been established as an effective way to provide highly reliable disk subsystems. However, reliability in RAID sys- tems comes at the cost of extra disks and somewhat lower perfor- mance

Chandy, John A.

417

Reliability Analysis of Deduplicated and Erasure-Coded Storage  

E-Print Network [OSTI]

Reliability Analysis of Deduplicated and Erasure-Coded Storage Xiaozhou Li Mark Lillibridge Mustafa reliability are two primary concerns for modern storage systems. Chunk-based deduplication, which breaks up for saving storage space. However, deduplication affects data reliability because an object's constituent

Lillibridge, Mark

418

A note on independent-disjoint analysis of network reliability  

E-Print Network [OSTI]

A note on independent-disjoint analysis of network reliability R. E. Andersen Department include both SDPs and OBDDs, and are well suited for network reliability computations. Keywords. Sum of disjoint products; Binary decision diagram; Net- work reliability; Boolean function 1 #12;Network

Traldi, Lorenzo

419

Structural Reliability Analysis for One Dimensional, Two Phase Miscible Flow  

E-Print Network [OSTI]

Structural Reliability Analysis for One Dimensional, Two Phase Miscible Flow David A. Coker­3600 December 22, 1992 Abstract An analytic structural reliability analysis is performed for first contact mis of the permeability. Key words: miscible flow, reliability methods, sensitivity analysis AMS(MOS): 35R60, 62N05,

New York at Stoney Brook, State University of

420

On some statistical aspects of software testing and reliability  

E-Print Network [OSTI]

On some statistical aspects of software testing and reliability Frank P.A. Coolen Abstract and reliability. Several difficulties are highlighted and several research challenges are discussed. Overall useful inferences on software reliability if the statistical methods are considered to be an `add

Coolen, Frank

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Seeking Reliability in Freedom: The Case of F/OSS  

E-Print Network [OSTI]

Chapter 15 Seeking Reliability in Freedom: The Case of F/OSS Hamid R. Ekbia and Les Gasser Abstract The risks and hazards involved in computerized environments have turned "reliability" into a major is that more reliable, secure, and efficient software can be produced under the free/open source software (F

Indiana University

422

On the Reliability of Wireless Sensor Networks Communications  

E-Print Network [OSTI]

On the Reliability of Wireless Sensor Networks Communications Alexandre Mouradian and Isabelle Aug applications, which must meet time and reliability requirements. Works on the real-time ca- pability of WSNs have been proposed [1]. In this paper we propose to study the achievable reliability of WSNs, tacking

Paris-Sud XI, Université de

423

Development of a Successful Program in Reliability and Maintainability Engineering  

E-Print Network [OSTI]

and Maintainability Center The Maintenance and Reliability Center is a university - industry association dedicated at UT · Reliability and Maintainability Center (RMC) ­ University - industry association dedicated and reliability technologies and management principles ­ Industrial Center since 1996 with ~30 members

Bernstein, Joseph B.

424

Estimation of Photovoltaic System Reliability and Performance Metrics  

E-Print Network [OSTI]

1 Estimation of Photovoltaic System Reliability and Performance Metrics Sairaj V. Dhople, Student reliability and perfor- mance analysis of grid-tied photovoltaic (PV) systems is for- mulated using Markov and energy yield, and reliability metrics such as availability. The paper also provides an analytical method

Liberzon, Daniel

425

RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT)  

E-Print Network [OSTI]

RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT) Yizhou Lu, T. M. Delorm, A. Christou of the reliability of these 5 Types Surrogate failure rate data Onshore wind turbines (OT) 1-1.5MW CONCLUSIONS., Faulstich, S. & van Bussel G. J. W. Reliability & availability of wind turbine electrical & electronic

Bernstein, Joseph B.

426

Photovoltaic Module Reliability Workshop 2011: February 16-17, 2011  

SciTech Connect (OSTI)

NREL's Photovoltaic (PV) Module Reliability Workshop (PVMRW) brings together PV reliability experts to share information, leading to the improvement of PV module reliability. Such improvement reduces the cost of solar electricity and promotes investor confidence in the technology--both critical goals for moving PV technologies deeper into the electricity marketplace.

Kurtz, S.

2013-11-01T23:59:59.000Z

427

Opis: Reliable Distributed Systems in OCaml Pierre-Evariste Dagand  

E-Print Network [OSTI]

Opis: Reliable Distributed Systems in OCaml Pierre-Evariste Dagand ENS Cachan-Bretagne, France concurrent and distributed systems, making them more widespread and more reliable. Among several models and imple- mentation challenges in developing reliable distributed sys- tems, making the field an excellent

Kuncak, Viktor

428

Guest Editorial: Special Issue on Reliable Distributed Systems  

E-Print Network [OSTI]

Guest Editorial: Special Issue on Reliable Distributed Systems Shambhu J. Upadhyaya, Senior Member, designers, and implementers of distributed systems, with emphasis on system properties such as reliability with the 19th IEEE Symposium on Reliable Distributed Systems held at Nuernberg, Germany, 2000, but the topics

Firenze, Universit degli Studi di

429

Photovoltaic Module Reliability Workshop 2012: February 28 - March 1, 2012  

SciTech Connect (OSTI)

NREL's Photovoltaic (PV) Module Reliability Workshop (PVMRW) brings together PV reliability experts to share information, leading to the improvement of PV module reliability. Such improvement reduces the cost of solar electricity and promotes investor confidence in the technology--both critical goals for moving PV technologies deeper into the electricity marketplace.

Kurtz, S.

2013-11-01T23:59:59.000Z

430

Photovoltaic Module Reliability Workshop 2013: February 26-27, 2013  

SciTech Connect (OSTI)

NREL's Photovoltaic (PV) Module Reliability Workshop (PVMRW) brings together PV reliability experts to share information, leading to the improvement of PV module reliability. Such improvement reduces the cost of solar electricity and promotes investor confidence in the technology--both critical goals for moving PV technologies deeper into the electricity marketplace.

Kurtz, S.

2013-10-01T23:59:59.000Z

431

A QUALITY CONTROL FRAMEWORK FOR BUS SCHEDULE RELIABILITY  

E-Print Network [OSTI]

A QUALITY CONTROL FRAMEWORK FOR BUS SCHEDULE RELIABILITY JIE LIN*, University of Illinois Institute A QUALITY CONTROL FRAMEWORK FOR BUS SCHEDULE RELIABILITY Abstract This paper develops and demonstrates a quality control framework for bus schedule reliability. Automatic Vehicle Location (AVL) devices

Illinois at Chicago, University of

432

Qualitative human reliability analysis for spent fuel handling  

SciTech Connect (OSTI)

Human reliability analysis (HRA) methods have been developed primarily to provide information for use in probabilistic risk assessments (PRAs) that analyze nuclear power plant (NPP) operations. Given the original emphasis of these methods, it is understandable that many HRAs have not ventured far from NPP control room applications. Despite this historical focus on the control room, there has been growing interest and discussion regarding the application of HRA methods to other NPP activities such as spent fuel handling (SFH) or operations in different types of facilities. One recently developed HRA method, 'A Technique for Human Event Analysis' (ATHEANA) has been proposed as a promising candidate for diverse applications due to its particular approach for systematically uncovering the dynamic, contextual conditions influencing human performance. This paper describes one successful test of this proposition by presenting portions of a recently completed project in which a scoping study was performed to accomplish the following goals: (1) investigate what should be included in a qualitative HRA for spent fuel and cask handling operations; and (2) demonstrate that the ATHEANA HRA technique can be usefully applied to these operations. The preliminary, scoping qualitative HRA examined, in a generic manner, how human performance of SFH and dry cask storage operations (DCSOs) can plausibly lead to radiological consequences that impact the public and the environment. The study involved the performance of typical, qualitative HRA tasks such as collecting relevant information and the preliminary identification of human failure events or unsafe actions, relevant influences (e.g., performance shaping factors, other contextual factors), event scenario development and categorization of human failure event (HFE) scenario groupings. Information from relevant literature sources was augmented with subject matter expert interviews and analysis of an edited video of selected operations. Elements of NUREG-1792, Good Practices for Implementing Human Reliability Analyses (HRA) and NUREG-1624, Rev. 1, Technical Basis and Implementation Guidelines for A Technique for Human Event Analysis (ATHEANA) formed critical parts of the technical basis for the preliminary analysis. Mis-loading of spent fuel into a cask and dropping of a loaded cask were the two human failure event groupings of primary interest, although all human performance aspects of DCSOs were considered to some extent. Of important note is that HRA is typically performed in the context of a plant-specific PRA study. This analysis was performed without the benefit of the context provided by a larger PRA study, nor was it plant specific, and so it investigated only generic HRA issues relevant to SFH. However, the improved understanding of human performance issues provided by the study will likely enhance the ability to carry out a detailed qualitative HRA for a specific NPP at some point in the future. Furthermore, support was obtained regarding the potential for applying ATHEANA beyond NPP settings. This paper provides a description of the process followed during the analysis, a description of the HFE scenario groupings, discussion regarding general human performance vulnerabilities, and a detailed examination of one HFE scenario developed in the study. (authors)

Brewer, J. D. [Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185-0748 (United States); Amico, P. [Science Applications International Corporation (United States); Cooper, S. E. [United Stated Nuclear Regulatory Commission (United States)

2006-07-01T23:59:59.000Z

433

NREL: Performance and Reliability R&D - Real-Time Reliability R&D  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the Contributions and AchievementsResearchReliability WorkshopsReal-Time Reliability

434

Adhesion and Thin-Film Module Reliability  

SciTech Connect (OSTI)

Among the infrequently measured but essential properties for thin-film (T-F) module reliability are the interlayer adhesion and cohesion within a layer. These can be cell contact layers to glass, contact layers to the semiconductor, encapsulant to cell, glass, or backsheet, etc. We use an Instron mechanical testing unit to measure peel strengths at 90deg or 180deg and, in some cases, a scratch and tape pull test to evaluate inter-cell layer adhesion strengths. We present peel strength data for test specimens laminated from the three T-F technologies, before and after damp heat, and in one instance at elevated temperatures. On laminated T-F cell samples, failure can occur uniformly at any one of the many interfaces, or non-uniformly across the peel area at more than one interface. Some peel strengths are Lt1 N/mm. This is far below the normal ethylene vinyl acetate/glass interface values of >10 N/mm. We measure a wide range of adhesion strengths and suggest that adhesion measured under higher temperature and relative humidity conditions is more relevant for module reliability.

McMahon, T. J.; Jorgenson, G. J.

2006-01-01T23:59:59.000Z

435

Puget Sound area electric reliability plan. Draft environmental impact statement  

SciTech Connect (OSTI)

The Puget Sound Area Electric Reliability Plan Draft Environmental Impact Statement (DEIS) identifies the alternatives for solving a power system problem in the Puget Sound area. This Plan is undertaken by Bonneville Power Administration (BPA), Puget Sound Power & Light, Seattle City Light, Snohomish Public Utility District No. 1 (PUD), and Tacoma Public Utilities. The Plan consists of potential actions in Puget Sound and other areas in the State of Washington. A specific need exists in the Puget Sound area for balance between east-west transmission capacity and the increasing demand to import power generated east of the Cascades. At certain times of the year, there is more demand for power than the electric system can supply in the Puget Sound area. This high demand, called peak demand, occurs during the winter months when unusually cold weather increases electricity use for heating. The existing power system can supply enough power if no emergencies occur. However, during emergencies, the system will not operate properly. As demand grows, the system becomes more strained. To meet demand, the rate of growth of demand must be reduced or the ability to serve the demand must be increased, or both. The plan to balance Puget Sound`s power demand and supply has these purposes: The plan should define a set of actions that would accommodate ten years of load growth (1994--2003). Federal and State environmental quality requirements should be met. The plan should be consistent with the plans of the Northwest Power Planning Council. The plan should serve as a consensus guideline for coordinated utility action. The plan should be flexible to accommodate uncertainties and differing utility needs. The plan should balance environmental impacts and economic costs. The plan should provide electric system reliability consistent with customer expectations. 29 figs., 24 tabs.

Not Available

1991-09-01T23:59:59.000Z

436

Puget Sound Area Electric Reliability Plan : Draft Environmental Impact State.  

SciTech Connect (OSTI)

The Puget Sound Area Electric Reliability Plan Draft Environmental Impact Statement (DEIS) identifies the alternatives for solving a power system problem in the Puget Sound area. This Plan is undertaken by Bonneville Power Administration (BPA), Puget Sound Power Light, Seattle City Light, Snohomish Public Utility District No. 1 (PUD), and Tacoma Public Utilities. The Plan consists of potential actions in Puget Sound and other areas in the State of Washington. A specific need exists in the Puget Sound area for balance between east-west transmission capacity and the increasing demand to import power generated east of the Cascades. At certain times of the year, there is more demand for power than the electric system can supply in the Puget Sound area. This high demand, called peak demand, occurs during the winter months when unusually cold weather increases electricity use for heating. The existing power system can supply enough power if no emergencies occur. However, during emergencies, the system will not operate properly. As demand grows, the system becomes more strained. To meet demand, the rate of growth of demand must be reduced or the ability to serve the demand must be increased, or both. The plan to balance Puget Sound's power demand and supply has these purposes: The plan should define a set of actions that would accommodate ten years of load growth (1994--2003). Federal and State environmental quality requirements should be met. The plan should be consistent with the plans of the Northwest Power Planning Council. The plan should serve as a consensus guideline for coordinated utility action. The plan should be flexible to accommodate uncertainties and differing utility needs. The plan should balance environmental impacts and economic costs. The plan should provide electric system reliability consistent with customer expectations. 29 figs., 24 tabs.

United States. Bonneville Power Administration.

1991-09-01T23:59:59.000Z

437

Limited Commercial Maintenance (LCLM) Limited Lawn & Ornamental (LLO)  

E-Print Network [OSTI]

, Limited Commercial Landscape Maintenance, Ornamental & Turf, Private Ag, or General Standards CORE for Limited Commercial Landscape Maintenance (LCLM), you must attend all day to earn the 6 CEUs required. Limited Commercial Maintenance (LCLM) Limited Lawn & Ornamental (LLO) Training & Exams Date

Florida, University of

438

Electric Power Reliability in Chemical Plants  

E-Print Network [OSTI]

. The biggest limiting factor to solving the actual problems is the dollar cost associated with that solution. Each solution must have a payback period that meets the economic criteria for return on investment for either the industry or the utility....

Cross, M. B.

439

Communication Reliability in Network on Chip Designs  

E-Print Network [OSTI]

The performance of low latency Network on Chip (NoC) architectures, which incorporate fast bypass paths to reduce communication latency, is limited by crosstalk induced skewing of signal transitions on link wires. As a result of crosstalk...

Kumar, Reeshav

2012-10-19T23:59:59.000Z

440

An evaluation of the reliability and usefulness of external-initiator PRA (probabilistic risk analysis) methodologies  

SciTech Connect (OSTI)

The discipline of probabilistic risk analysis (PRA) has become so mature in recent years that it is now being used routinely to assist decision-making throughout the nuclear industry. This includes decision-making that affects design, construction, operation, maintenance, and regulation. Unfortunately, not all sub-areas within the larger discipline of PRA are equally mature,'' and therefore the many different types of engineering insights from PRA are not all equally reliable. 93 refs., 4 figs., 1 tab.

Budnitz, R.J.; Lambert, H.E. (Future Resources Associates, Inc., Berkeley, CA (USA))

1990-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Flow reversal power limit for the HFBR  

SciTech Connect (OSTI)

The High Flux Beam Reactor (HFBR) undergoes a buoyancy-driven reversal of flow in the reactor core following certain postulated accidents. Uncertainties about the afterheat removal capability during the flow reversal has limited the reactor operating power to 30 MW. An experimental and analytical program to address these uncertainties is described in this report. The experiments were single channel flow reversal tests under a range of conditions. The analytical phase involved simulations of the tests to benchmark the physical models and development of a criterion for dryout. The criterion is then used in simulations of reactor accidents to determine a safe operating power level. It is concluded that the limit on the HFBR operating power with respect to the issue of flow reversal is in excess of 60 MW.

Cheng, Lap Y.; Tichler, P.R.

1995-10-01T23:59:59.000Z

442

Reliable Networking Infrastructures A Brief Overview of Research in Reliable Networking  

E-Print Network [OSTI]

Institute FOKUS, Berlin ++ www.fokus.fraunhofer.de/go/innovation ++ 11­2009 #12;Security Reliable Networking structure (RNI) Group Launched by Dr.Yacine Rebahi and Dragos Ving arzan at Fraunhofer FOKUS. Senior at the Fraunhofer FOKUS competence center NGNI. Prior to joining FOKUS in 2002, he worked at Ericsson in Voice over

Wichmann, Felix

443

In-Plant Reliability Data base for nuclear plant components. Interim report: diesel generators, batteries, chargers and inverters  

SciTech Connect (OSTI)

The objective of the In-Plant Reliability Data (IPRD) program is to develop a comprehensive, component-specific reliability data base for probabilistic risk assessment and for other statistical analyses relevant to component reliability evaluations. This document is the product of a pilot study that was undertaken to demonstrate the methodology and feasibility of applying IPRDS techniques to develop and analyze the reliability characteristics of key electrical components in five nuclear power plants. These electrical components include diesel generators, batteries, battery chargers and inverters. The sources used to develop the data base and produce the component failure rates and mean repair times were the plant equipment lists, plant drawings, maintenance work requests, Final Safety Analysis Reports (FSARs), and interviews with plant personnel. The data spanned approximately 33 reactor-years of commercial operation.

Kahl, W.K.; Borkowski, R.J.

1985-01-01T23:59:59.000Z

444

Advancing Usability Evaluation through Human Reliability Analysis  

SciTech Connect (OSTI)

This paper introduces a novel augmentation to the current heuristic usability evaluation methodology. The SPAR-H human reliability analysis method was developed for categorizing human performance in nuclear power plants. Despite the specialized use of SPAR-H for safety critical scenarios, the method also holds promise for use in commercial off-the-shelf software usability evaluations. The SPAR-H method shares task analysis underpinnings with human-computer interaction, and it can be easily adapted to incorporate usability heuristics as performance shaping factors. By assigning probabilistic modifiers to heuristics, it is possible to arrive at the usability error probability (UEP). This UEP is not a literal probability of error but nonetheless provides a quantitative basis to heuristic evaluation. When combined with a consequence matrix for usability errors, this method affords ready prioritization of usability issues.

Ronald L. Boring; David I. Gertman

2005-07-01T23:59:59.000Z

445

Reliability analysis of steel-containment strength  

SciTech Connect (OSTI)

A best estimate and uncertainty assessment of the resistance of the St. Lucie, Cherokee, Perry, WPPSS and Browns Ferry containment vessels was performed. The Monte Carlo simulation technique and second moment approach were compared as a means of calculating the probability distribution of the containment resistance. A uniform static internal pressure was used and strain ductility was taken as the failure criterion. Approximate methods were developed and calibrated with finite element analysis. Both approximate and finite element analyses were performed on the axisymmetric containment structure. An uncertainty assessment of the containment strength was then performed by the second moment reliability method. Based upon the approximate methods, the cumulative distribution for the resistance of each of the five containments (shell modes only) is presented.

Greimann, L.G.; Fanous, F.; Wold-Tinsae, A.; Ketalaar, D.; Lin, T.; Bluhm, D.

1982-06-01T23:59:59.000Z

446

HUMAN RELIABILITY ANALYSIS FOR COMPUTERIZED PROCEDURES  

SciTech Connect (OSTI)

This paper provides a characterization of human reliability analysis (HRA) issues for computerized procedures in nuclear power plant control rooms. It is beyond the scope of this paper to propose a new HRA approach or to recommend specific methods or refinements to those methods. Rather, this paper provides a review of HRA as applied to traditional paper-based procedures, followed by a discussion of what specific factors should additionally be considered in HRAs for computerized procedures. Performance shaping factors and failure modes unique to computerized procedures are highlighted. Since there is no definitive guide to HRA for paper-based procedures, this paper also serves to clarify the existing guidance on paper-based procedures before delving into the unique aspects of computerized procedures.

Ronald L. Boring; David I. Gertman; Katya Le Blanc

2011-09-01T23:59:59.000Z

447

Nuclear Power - Control, Reliability and Human Factors  

E-Print Network [OSTI]

Instrumentation and Control 49 H.M. Hashemian Chapter 4 Design Considerations for the Implementation of a Mobile IP Telephony System in a Nuclear Power Plant 67 J. Garc?a-Hern?ndez, J. C. Vel?zquez- Hern?ndez, C. F. Garc?a-Hern?ndez and M. A. Vallejo-Alarc?n... Reliability K s e n i i a Sapoz h n i k o v a and Roald Tayma n o v D.I.Mendeleyev Institute for Metrology, Russia 1. Introduction At present, a great number of embedded sens o r devi c es provi d e monito r i n g of operat i n g condi t io n...

448

Optical limiting materials  

DOE Patents [OSTI]

Methanofullerenes, fulleroids and/or other fullerenes chemically altered for enhanced solubility, in liquid solution, and in solid blends with transparent glass (SiO{sub 2}) gels or polymers, or semiconducting (conjugated) polymers, are shown to be useful as optical limiters (optical surge protectors). The nonlinear absorption is tunable such that the energy transmitted through such blends saturates at high input energy per pulse over a wide range of wavelengths from 400--1,100 nm by selecting the host material for its absorption wavelength and ability to transfer the absorbed energy into the optical limiting composition dissolved therein. This phenomenon should be generalizable to other compositions than substituted fullerenes. 5 figs.

McBranch, D.W.; Mattes, B.R.; Koskelo, A.C.; Heeger, A.J.; Robinson, J.M.; Smilowitz, L.B.; Klimov, V.I.; Cha, M.; Sariciftci, N.S.; Hummelen, J.C.

1998-04-21T23:59:59.000Z

449

Operating Experience Review of the INL HTE Gas Monitoring System  

SciTech Connect (OSTI)

This paper describes the operations of several types of gas monitors in use at the Idaho National Laboratory (INL) High Temperature Electrolysis Experiment (HTE) laboratory. The gases monitored at hydrogen, carbon monoxide, carbon dioxide, and oxygen. The operating time, calibration, and unwanted alarms are described. The calibration session time durations are described. Some simple statistics are given for the reliability of these monitors and the results are compared to operating experiences of other types of monitors.

L. C. Cadwallader; K. G. DeWall

2010-06-01T23:59:59.000Z

450

Field Operations Program Activities Status Report  

SciTech Connect (OSTI)

The Field Operations Program is an electric vehicle testing and evaluation program sponsored by US Department of Energy and managed by the Idaho National Engineering and Environmental Laboratory. The Program's goals are to evaluate electric vehicles in real-world applications and environments, support electric vehicle technology advancement, develop infrastructure elements necessary to support significant electric vehicle use, support increased use of electric vehicles in federal fleets, and increase overall awareness and acceptance of electric vehicles. This report covers Program activities from fiscal year 1997 through mid-fiscal year 1999. The Field Operations Program succeeded the Site Operator Program, which ended in September 1996. Electric vehicle testing conducted by the Program includes baseline performance testing (EV America testing), accelerated reliability (life-cycle) testing, and fleet testing. The baseline performance parameters include accelerations, braking, range, energy efficiency, and charging time. The Program collects accelerated reliability and fleet operations data on electric vehicles operated by the Program's Qualified Vehicle Testing (QVT) partners. The Program's QVT partners have over 3 million miles of electric vehicle operating experience.

J. E. Francfort; D. V. O'Hara; L. A. Slezak

1999-05-01T23:59:59.000Z

451

Systems Analysis Programs for Hands-on Intergrated Reliability Evaluations (SAPHIRE) Summary Manual  

SciTech Connect (OSTI)

The Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) is a software application developed for performing a complete probabilistic risk assessment (PRA) using a personal computer (PC) running the Microsoft Windows operating system. SAPHIRE is primarily funded by the U.S. Nuclear Regulatory Commission (NRC) and developed by the Idaho National Laboratory (INL). INL's primary role in this project is that of software developer and tester. However, INL also plays an important role in technology transfer by interfacing and supporting SAPHIRE users, who constitute a wide range of PRA practitioners from the NRC, national laboratories, the private sector, and foreign countries. SAPHIRE can be used to model a complex systems response to initiating events and quantify associated consequential outcome frequencies. Specifically, for nuclear power plant applications, SAPHIRE can identify important contributors to core damage (Level 1 PRA) and containment failure during a severe accident which lead to releases (Level 2 PRA). It can be used for a PRA where the reactor is at full power, low power, or at shutdown conditions. Furthermore, it can be used to analyze both internal and external initiating events and has special features for transforming an internal events model to a model for external events, such as flooding and fire analysis. It can also be used in a limited manner to quantify risk in terms of release consequences to the public and environment (Level 3 PRA). SAPHIRE also includes a separate module called the Graphical Evaluation Module (GEM). GEM is a special user interface linked to SAPHIRE that automates the SAPHIRE process steps for evaluating operational events at commercial nuclear power plants. Using GEM, an analyst can estimate the risk associated with operational events (for example, to calculate a conditional core damage probability) very efficiently and expeditiously. This report provides an overview of the functions available in SAPHIRE and presents general instructions for using the software. Section 1 presents SAPHIREs historical evolution and summarizes its capabilities. Section 2 presents instructions for installing and using the code. Section 3 explains the database structure used in SAPHIRE and discusses database concepts. Section 4 explains how PRA data (event frequencies, human error probabilities, etc.) can be generated and manipulated using change sets. Section 5 deals with fault tree operations, including constructing, editing, solving, and displaying results. Section 6 presents operations associated with event trees, including rule application for event tree linking, partitioning, and editing sequences. Section 7 presents how accident sequences are generated, solved, quantified, and analyzed. Section 8 discusses the functions available for performing end state analysis. Section 9 explains how to modify data stored in a SAPHIRE database. Section 10 illustrates how to generate and customize reports. Section 11 covers SAPHIRE utility options to perform routine functions such as defining constant values, recovering databases, and loading data from external sources. Section 12 provides an overview of GEMs features and capabilities. Finally, Section 13 summarizes SAPHIREs quality assurance process.

C. L. Smith

2008-08-01T23:59:59.000Z

452

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

13 Table 6. 2006 Renewable Energy & Estimated Requirementsin2020. Table 4. Renewable Energy and Capacity2006fortransferofrenewableenergyfromtheL.A. Basin Area

Budhraja, Vikram

2008-01-01T23:59:59.000Z

453

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

allremoteresource (renewableandnon?renewable)totheallremoteresource (renewable andnon?renewable)totheutilizationofrenewable resourcesandmeetingtheRPS.

Budhraja, Vikram

2008-01-01T23:59:59.000Z

454

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

3. Renewable Energy Production Required for Alternative RPS33percentRPSby2020,energyproductionfromrenewablesuchastheirdailyenergyproductionprofiles).

Budhraja, Vikram

2008-01-01T23:59:59.000Z

455

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

12 Table 3. Renewable Energy Production Required forTable Table 3. Renewable Energy Production Required forEnergy Consumption Renewable Energy Production B kWH Year In

Budhraja, Vikram

2008-01-01T23:59:59.000Z

456

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

The20,000MWofrenewableresourcestobedevelopedwillgreaterutilizationofrenewable resourcesandmeetingtheof renewable resources. ..16 Table 8.

Budhraja, Vikram

2008-01-01T23:59:59.000Z

457

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

in2020. Table 4. Renewable Energy and Capacity200612 Table 4. Renewable Energy and Capacity2006 Recorded,In-State Renewableenergyandcapacityrequirementsfor20%

Budhraja, Vikram

2008-01-01T23:59:59.000Z

458

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

Options on Renewables Integration ..28Issues and Action Items for Renewables Integration.additionalenergyfromrenewableswillbe neededtomeet

Budhraja, Vikram

2008-01-01T23:59:59.000Z

459

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

Devers, AntelopeandVincent;solarthermalatLugo;andscale developmentofwind,solarthermal,andgeothermalwithinloadcenters. SolarThermal7,000MWtotal,with

Budhraja, Vikram

2008-01-01T23:59:59.000Z

460

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

MapofSolarResourcePotentialinCalifornia, [http://maps/solar_potential.html]. CaliforniaEnergySolarThermalBarstow,Mohave,andCentralCalifornia For

Budhraja, Vikram

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Renewable Resource Integration Project - Scoping Study of Strategic Transmission, Operations, and Reliability Issues  

E-Print Network [OSTI]

productionlevelfromsmallhydroasrecordedin2006. kWH Geothermal Biomass Small Hydro 830 est Wind Solar TotalRPS Geothermal Biomass Small Hydro 830 est Wind Solar Total

Budhraja, Vikram

2008-01-01T23:59:59.000Z

462

Applications of Automatic Vehicle Location systems towards improving service reliability and operations planning in London  

E-Print Network [OSTI]

Technological advances in the transit industry, such as the introduction of Automatic Vehicle Location (AVL) systems, have provided agencies with robust data collection and measurement systems and enabled the development ...

Ehrlich, Joseph Emanuel

2010-01-01T23:59:59.000Z

463

MBTA Green Line 3-car train operating plans to enhance capacity and reliability  

E-Print Network [OSTI]

Transit agencies face a variety of challenges, from increasing ridership to changes in infrastructure, to system expansions, all of which require significant preparation to accommodate the changes without affecting passengers ...

Malikova, Alexandra A

2012-01-01T23:59:59.000Z

464

Property:Do Records of Operation of System Prove Reliable Performance? |  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscot County, Maine:Plug PowerAddressDataFormat Jump to: navigation, searchThis

465

Reliability and validity of brief psychosocial measures related to dietary behaviors  

E-Print Network [OSTI]

as: Norman et al. , Reliability and validity of brief46. 31. Shrout PE: Measurement reliability and agreement inRESEARCH Open Access Reliability and validity of brief

Norman, Gregory J; Carlson, Jordan A; Sallis, James F; Wagner, Nicole; Calfas, Karen J; Patrick, Kevin

2010-01-01T23:59:59.000Z

466

E-Print Network 3.0 - assessing system reliability Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

reliability Search Powered by Explorit Topic List Advanced Search Sample search results for: assessing system reliability Page: << < 1 2 3 4 5 > >> 1 Reliability Based...

467

Reliability-based framework for fatigue damage prognosis of bonded structural elements in aerospace composite structures  

E-Print Network [OSTI]

H. Asada, and S. Ito, Reliability of aircraft structuresH.O. Madsen, Structural reliability methods , Wiley, WestH. Asada, and S. Ito, Reliability of aircraft structures

Gobbato, Maurizio

2011-01-01T23:59:59.000Z

468

Reliability-based characterization of prefabricated FRP composites for rehabilitation of concrete structures  

E-Print Network [OSTI]

of Material Variability in Reliability Analysis of FRPStatistical Analysis of Reliability and Life-Testing Models,SE 224: Structural Reliability and Risk Analysis, Course

Jin, Sung-Jun

2008-01-01T23:59:59.000Z

469

Investigation of the Role of Trap States in Solar Cell Reliability using Photothermal Deflection Spectroscopy  

E-Print Network [OSTI]

of PV materials Reliability of photovoltaic materials isof photovoltaic (PV) technologies. PV reliability andPhotovoltaics Properties and Characterization .. 9 1.5. Degradation and Reliability

Bezryadina, Anna Sergeyevna

2012-01-01T23:59:59.000Z

470

Self-consistent electro-thermal simulation of AIGaN/GaN HEMTs for reliability prediction  

E-Print Network [OSTI]

n this paper, we have developed the first fully-coupled electro-thermo-mechanical simulation of AIGaN/GaN HEMTs to study the reliability of these devices as a function of bias voltage and operating temperature. In addition, ...

Gao, Feng, Ph. D. Massachusetts Institute of Technology

471

Novel Low Cost, High Reliability Wind Turbine Drivetrain  

SciTech Connect (OSTI)

Clipper Windpower, in collaboration with United Technologies Research Center, the National Renewable Energy Laboratory, and Hamilton Sundstrand Corporation, developed a low-cost, deflection-compliant, reliable, and serviceable chain drive speed increaser. This chain and sprocket drivetrain design offers significant breakthroughs in the areas of cost and serviceability and addresses the key challenges of current geared and direct-drive systems. The use of gearboxes has proven to be challenging; the large torques and bending loads associated with use in large multi-MW wind applications have generally limited demonstrated lifetime to 8-10 years [1]. The large cost of gearbox replacement and the required use of large, expensive cranes can result in gearbox replacement costs on the order of $1M, representing a significant impact to overall cost of energy (COE). Direct-drive machines eliminate the gearbox, thereby targeting increased reliability and reduced life-cycle cost. However, the slow rotational speeds require very large and costly generators, which also typically have an undesirable dependence on expensive rare-earth magnet materials and large structural penalties for precise air gap control. The cost of rare-earth materials has increased 20X in the last 8 years representing a key risk to ever realizing the promised cost of energy reductions from direct-drive generators. A common challenge to both geared and direct drive architectures is a limited ability to manage input shaft deflections. The proposed Clipper drivetrain is deflection-compliant, insulating later drivetrain stages and generators from off-axis loads. The system is modular, allowing for all key parts to be removed and replaced without the use of a high capacity crane. Finally, the technology modularity allows for scalability and many possible drivetrain topologies. These benefits enable reductions in drivetrain capital cost by 10.0%, levelized replacement and O&M costs by 26.7%, and overall cost of energy by 10.2%. This design was achieved by: (1) performing an extensive optimization study that deter-mined the preliminary cost for all practical chain drive topologies to ensure the most competitive configuration; (2) conducting detailed analysis of chain dynamics, contact stresses, and wear and efficiency characteristics over the chain???????¢????????????????s life to ensure accurate physics-based predictions of chain performance; and (3) developing a final product design, including reliability analysis, chain replacement procedures, and bearing and sprocket analysis. Definition of this final product configuration was used to develop refined cost of energy estimates. Finally, key system risks for the chain drive were defined and a comprehensive risk reduction plan was created for execution in Phase 2.

Anthony Chobot; Debarshi Das; Tyler Mayer; Zach Markey; Tim Martinson; Hayden Reeve; Paul Attridge; Tahany El-Wardany

2012-09-13T23:59:59.000Z

472

Enhanced Component Performance Study: Motor-Operated Valves 19982012  

SciTech Connect (OSTI)

This report presents an enhanced performance evaluation of motor-operated valves (MOVs) at U.S. commercial nuclear power plants. The data used in this study are based on the operating experience failure reports from fiscal year 1998 through 2012 for the component reliability as reported in the Equipment Performance and Information Exchange (EPIX). The MOV failure modes considered are failure to open/close, failure to operate or control, and spurious operation. The component reliability estimates and the reliability data are trended for the most recent 10-year period while yearly estimates for reliability are provided for the entire active period. No statistically significant increasing trends were identified in the MOV results. Statistically significant decreasing trends were identified for failure to open/close and operation demands.

T. E. Wierman

2013-10-01T23:59:59.000Z

473

Reliability Assessment Commitment Process (RAC) A. Introduction  

E-Print Network [OSTI]

to enable the Midwest ISO to commit additional supply if needed to meet the system load forecast and reserve such responsibilities to each of the Balancing Area Operators, for the following reasons: The need to commit additional by the Midwest ISO on a system-wide basis throughout the Midwest ISO Region, rather than on a Balancing Area

McCalley, James D.

474

Using Accelerated Testing To Predict Module Reliability: Preprint  

SciTech Connect (OSTI)

Long-term reliability is critical to the cost effectiveness and commercial success of photovoltaic (PV) products. Today most PV modules are warranted for 25 years, but there is no accepted test protocol to validate a 25-year lifetime. The qualification tests do an excellent job of identifying design, materials, and process flaws that are likely to lead to premature failure (infant mortality), but they are not designed to test for wear-out mechanisms that limit lifetime. This paper presents a method for evaluating the ability of a new PV module technology to survive long-term exposure to specific stresses. The authors propose the use of baseline technologies with proven long-term field performance as controls in the accelerated stress tests. The performance of new-technology modules can then be evaluated versus that of proven-technology modules. If the new-technology demonstrates equivalent or superior performance to the proven one, there is a high likelihood that they will survive versus the tested stress in the real world.

Wohlgemuth, J. H.; Kurtz, S.

2011-07-01T23:59:59.000Z

475

Chiller Plant Design Goals Low operating cost  

E-Print Network [OSTI]

3/9/09 1 2 Chiller Plant Design Goals · Low operating cost ­Energy Efficiency ­No full time staffing · Reliability ­24/7 ­ 365 ­Maintainability · Future expansion capability #12;3/9/09 2 3 Chiller T 4 Chiller Plant Electrical · Electrical ­N+1 transformer capacity ­4160 volt Compressor Motors

476

Heat flux limiting sleeves  

DOE Patents [OSTI]

A heat limiting tubular sleeve extending over only a portion of a tube having a generally uniform outside diameter, the sleeve being open on both ends, having one end thereof larger in diameter than the other end thereof and having a wall thickness which decreases in the same direction as the diameter of the sleeve decreases so that the heat transfer through the sleeve and tube is less adjacent the large diameter end of the sleeve than adjacent the other end thereof.

Harris, William G. (Tampa, FL)

1985-01-01T23:59:59.000Z

477

High reliability plastic packaging for microelectronics  

SciTech Connect (OSTI)

Goal was Assembly Test Chips (ATCs) which could be used for evaluating plastic encapsulation technologies. Circuits were demonstrated for measuring Au-Al wirebond and Al metal corrosion failure rates during accelerated temperature and humidity testing. The test circuits on the ATC02.5 chip were very sensitive to extrinsic or processing induced failure rates. Accelerated aging experiments were conducted with unpassivated triple track Al structures on the ATC02.6 chip; the unpassivated tracks were found to be very sensitive to particulate contamination. Some modifications to existing circuitry were suggested. The piezoresistive stress sensing circuitry designed for the ATC04 test chip was found suitable for determining the change in the state of mechanical stress at the die when both initial and final measurements were made near room temperature (RT). Attempt to measure thermal stress between RT and a typical polymer glass transition temperature failed because of excessive die resistor- substrate leakage currents at the high temperature end; suitable circuitry changes were developed to overcome this problem. One temperature and humidity experiment was conducted with Sandia developed static radom access memory parts to examine non-corrosion CMOS failures; this objective was not achieved, but corrosion failure at the metal to Si contacts on the die surface could be detected. This 2-year effort resulted in new designs for test circuits which could be used on an advanced ATC for reliability assessment in Defense Programs electronics development projects.

Sweet, J.N.; Peterson, D.W.; Hsia, A.H.; Tuck, M.

1997-07-01T23:59:59.000Z

478

On the limiting absorption principle and spectra of quantum graphs  

E-Print Network [OSTI]

The main result of the article is validity of the limiting absorption principle and thus absence of the singular continuous spectrum for compact quantum graphs with several infinite leads attached. The technique used involves Dirichlet-to-Neumann operators.

Beng-Seong Ong

2005-10-10T23:59:59.000Z

479

Cw rf operation of the FMIT RFQ  

SciTech Connect (OSTI)

The 80-MHz RFQ for the Fusion Materials Irradiation Test Facility prototype accelerator has been rf conditioned for cw operation to the design field level of 17.5 MV/m (1.68 x Kilpatrick limit). Experimental results and operating experience will be discussed.

Fazio, M.V.; Brandeberry, F.E.

1985-01-01T23:59:59.000Z

480

assisted lean operation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Portman, Douglas 31 Combustion lean limits fundamentals and their application to a SI hydrogen-enhanced engine concept MIT - DSpace Summary: Operating an engine with excess...

Note: This page contains sample records for the topic "reliability operating limit" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Hermitian Young operators  

SciTech Connect (OSTI)

Starting from conventional Young operators, we construct Hermitian operators which project orthogonally onto irreducible representations of the (special) unitary group.

Keppeler, Stefan, E-mail: stefan.keppeler@uni-tuebingen.de [Mathematisches Institut, Universitt Tbingen, Auf der Morgenstelle 10, 72076 Tbingen (Germany)] [Mathematisches Institut, Universitt Tbingen, Auf der Morgenstelle 10, 72076 Tbingen (Germany); Sjdahl, Malin, E-mail: malin.sjodahl@thep.lu.se [Department of Astronomy and Theoretical Physics, Lund University, Slvegatan 14A, 22362 Lund (Sweden)] [Department of Astronomy and Theoretical Physics, Lund University, Slvegatan 14A, 22362 Lund (Sweden)

2014-02-15T23:59:59.000Z

482

Thermal Stress and Reliability for Advanced Power Electronics...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

D.C. ape017okeefe2010o.pdf More Documents & Publications Thermal Performance and Reliability of Bonded Interfaces Physics of Failure of Electrical Interconnects Thermal Stress...

483

SciTech Connect: Improved Wind Turbine Drivetrain Reliability...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Improved Wind Turbine Drivetrain Reliability using a Combined Experimental, Computational, and Analytical Approach (Presentation) Citation Details In-Document Search Title:...

484

Optimization Online - Assessing the reliability of general-purpose ...  

E-Print Network [OSTI]

Apr 3, 2014 ... Assessing the reliability of general-purpose Inexact Restoration methods. E. G. Birgin(egbirgin ***at*** ime.usp.br) L. F. Bueno(lfelipebueno...

E. G. Birgin

2014-04-03T23:59:59.000Z

485

Thermal Stress and Reliability for Advanced Power Electronics...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Washington D.C. ape14okeefe.pdf More Documents & Publications Thermal Stress and Reliability for Advanced Power Electronics and Electric Machines Power Electronic Thermal...

486

Joint transmission system projects to improve system reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

County PUD, 425-783-8444 Joint transmission system projects to improve system reliability First major regional electric grid improvements in decades prepare the area for the...

487

Physics-Based Stress Corrosion Cracking Component Reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Physics-Based Stress Corrosion Cracking Component Reliability Model cast in an R7-Compatible Cumulative Damage Framework Draft Report Supporting Technology Inputs to the Risk-...

488

Electro-thermal-mechanical Simulation and Reliability for Plug...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

More Documents & Publications Electro-thermal-mechanical Simulation and Reliability for Plug-in Vehicle Converters and Inverters Electro-thermal-mechanical Simulation...

489

Manufacturing Metrology for c-Si Module Reliability/Durabiltiy  

Broader source: Energy.gov (indexed) [DOE]

Manufacturing Metrology for c-Si Module ReliabilityDurability Marianne P. Rodgers Marianne P. Rodgers Ashwani Kaul Kristopher O. Davis Neelkanth G. Dhere Hubert...

490

Forward Capacity Markets: Maintaining Grid Reliability in Europe.  

E-Print Network [OSTI]

?? The liberalization process of the electricity industry in many countries leads to new rules and new challenges for the grid management. System reliability is (more)

Chaigneau, Matthieu

2012-01-01T23:59:59.000Z

491

Power Electronics Reliability Kick Off Meeting ? Silicon Power...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Validated Through Broad Use Boating Defense Machine Tool Wind Energy Semiconductors Health Care 2 Project Goals * Better understand the current and future reliability of...

492

Improved Wind Turbine Drivetrain Reliability using a Combined...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

IMPROVED WIND TURBINE DRIVETRAIN RELIABILITY USING A COMBINED EXPERIMENTAL, COMPUTATIONAL, AND ANALYTICAL APPROACH Yi Guo 1,* , Roger Bergua 2 , Jeroen van Dam 1 , Jordi Jove 2 ,...

493

Imprecise reliability by evidential networks Christophe SIMON and Philippe WEBER  

E-Print Network [OSTI]

Imprecise reliability by evidential networks Christophe SIMON and Philippe WEBER October 3, 2008 to adequately tell variability from imprecision. Many representations exist C. Simon and Ph. Weber

Boyer, Edmond

494

Competition and Reliability in North American Electricity Markets...  

Broader source: Energy.gov (indexed) [DOE]

Blackout 2003: Electric System Working Group Technical Conference - Comments and Recommendations Competition and Reliability in North American Energy Markets: Issue Paper Synopses...

495

Competition and Reliability in North American Energy Markets...  

Broader source: Energy.gov (indexed) [DOE]

Energy Markets: Issue Paper Synopses Competition and Reliability in North American Energy Markets: Issue Paper Synopses Jack Casazza, Frank Delea, and George Loehr argue that...

496

Gearbox Reliability Collaborative Experimental Data Overview & Analysis (Presentation)  

SciTech Connect (OSTI)

This presentation details how wind turbine gearboxes fail to meet 20-year design life and how the Gearbox Reliability Collaborative (GRC) is addressing the challenges.

Oyague, F.

2010-05-01T23:59:59.000Z

497

Office of Electricity Delivery And Energy Reliability To Hold...  

Broader source: Energy.gov (indexed) [DOE]

Office of Electricity Delivery And Energy Reliability To Hold Technical Conference On The Design Of Future Electric Transmission Office of Electricity Delivery And Energy...

498

Office of Electricity Delivery and Energy Reliability, OE-20  

Broader source: Energy.gov (indexed) [DOE]

9 January, 2012 Office of Electricity Delivery and Energy Reliability, OE-20 U.S. Department of Energy 1000 Independence Avenue SW Washington, DC 20585 Greetings: The Wyoming...

499

Office of Electricity Delivery and Energy Reliability | Department...  

Broader source: Energy.gov (indexed) [DOE]

& Internships Funding Opportunities Information Center Contact Us Energy.gov Office of Electricity Delivery & Energy Reliability 1000 Independence Avenue, SW Washington, DC...

500

NREL Gearbox Reliability Collaborative Analysis Round Robin: Preprint  

SciTech Connect (OSTI)

The Gearbox Reliability Collaborative is working to determine the causes and loading conditions that result in the premature failure of wind turbine gearboxes.

Oyague, F.; Butterfield, C. P.; Sheng, S.

2009-05-01T23:59:59.000Z