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Title: Mesoscale Connections Winter 2018


No abstract provided.

 [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
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DOE Contract Number:
Resource Type:
Technical Report
Country of Publication:
United States

Citation Formats

Kippen, Karen Elizabeth, and Sandberg, Richard L. Mesoscale Connections Winter 2018. United States: N. p., 2018. Web. doi:10.2172/1417806.
Kippen, Karen Elizabeth, & Sandberg, Richard L. Mesoscale Connections Winter 2018. United States. doi:10.2172/1417806.
Kippen, Karen Elizabeth, and Sandberg, Richard L. 2018. "Mesoscale Connections Winter 2018". United States. doi:10.2172/1417806.
title = {Mesoscale Connections Winter 2018},
author = {Kippen, Karen Elizabeth and Sandberg, Richard L.},
abstractNote = {No abstract provided.},
doi = {10.2172/1417806},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2018,
month = 1

Technical Report:

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  • Our challenge derives from the fact that in metals or explosives grains, interfaces and defects control engineering performance in ways that are neither amenable to continuum codes (which fail to rigorously describe the heterogeneities derived from microstructure) nor computationally tractable to first principles atomistic calculations. This is a region called the mesoscale, which stands at the frontier of our desire to translate fundamental science insights into confidence in aging system performance over the range of extreme conditions relevant in a nuclear weapon. For dynamic problems, the phenomena of interest can require extremely good temporal resolutions. A shock wave traveling atmore » 1000 m/s (or 1 mm/μs) passes through a grain with a diameter of 1 micron in a nanosecond (10-9 sec). Thus, to observe the mesoscale phenomena—such as dislocations or phase transformations—as the shock passes, temporal resolution better than picoseconds (10-12 sec) may be needed. As we anticipate the science challenges over the next decade, experimental insights on material performance at the micron spatial scale with picosecond temporal resolution—at the mesoscale— are a clear challenge. This is a challenge fit for Los Alamos in partnership with our sister labs and academia. Mesoscale Connections will draw attention to our progress as we tackle the mesoscale challenge. We hope you like it and encourage suggestions of content you are interested in.« less
  • In response to a request from the United States Marshals Service (SIC-9221) in Washington, D.C. for assistance in testing the effect of renovations to the ventilation system of their indoor firing range, lead (7439921) exposures were measured during handgun qualifying sessions. Each qualifying session of firing consisted of 60 rounds fired in 10 to 12 minutes. Personal breathing zone air samples were taken from three shooters and the range officer. Lead exposure concentrations measured were 2073, 1786, 172, and 142 micrograms of lead per cubic meter of air (microg/cu m). Eight hour time weighted average concentrations were calculated to bemore » 194, 167, 101, and 13microg/cu m, respectively. The three shooters were therefore overexposed to lead. Bulk sampling of the sand from the bullet trap indicated it to be contaminated, containing 41% lead by weight. The authors concluded that a health hazard existed from exposure to lead. The authors recommended changes to improve the ventilation system. Following modification of the system, tests were again conducted and 11 of the 12 samples taken were below the limits of detection for the method used. The authors conclude that after modification, a hazard did not exist during qualifying sessions. The authors recommend specific measures to protect personnel from exposure to lead.« less
  • This paper is a product for the Department of Energy?s (DOE) Office of Science (OS) reporting on the feasibility of using HPSS into the Extreme Scale era of storage (2018 -2022). The initial sections provide a summary of the systems environment and expected archival storage requirements extracted from other Extreme Scale workshopreports conducted since 2007 by various applications and programs within the DOE OS. These high level requirements aid in identifying long-term data storage system features that support Extreme Scale science. Participants also separately forecasted data growth in established long-term data storage systems through 2018 - 2022 to get amore » picture of the amount of data that systems will need to manage. The report concludes that HPSS is well positioned to meet the requirements projected for the Extreme Scale era and provides recommendations from the HPSS Collaboration to the DOE Office of Science for ensuring that HPSS can meet these extreme scale storage requirements of 2018 - 2022.« less
  • The Enrico Fermi Atomic Power Plant, Unit 1 (Fermi 1) was a fast breeder reactor design that was cooled by sodium and operated at essentially atmospheric pressure. On May 10, 1963, the Atomic Energy Commission (AEC) granted an operating license, DPR-9, to the Power Reactor Development Company (PRDC), a consortium specifically formed to own and operate a nuclear reactor at the Fermi 1 site. The reactor was designed for a maximum capability of 430 megawatts (MW); however, the maximum reactor power with the first core loading (Core A) was 200 MW. The primary system was filled with sodium in Decembermore » 1960 and criticality was achieved in August 1963. The reactor was tested at low power during the first couple years of operation. Power ascension testing above 1 MW commenced in December 1965 immediately following the receipt of a high-power operating license. In October 1966 during power ascension, zirconium plates at the bottom of the reactor vessel became loose and blocked sodium coolant flow to some fuel subassemblies. Two subassemblies started to melt and the reactor was manually shut down. No abnormal releases to the environment occurred. Forty-two months later after the cause had been determined, cleanup completed, and the fuel replaced, Fermi 1 was restarted. However, in November 1972, PRDC made the decision to decommission Fermi 1 as the core was approaching its burn-up limit. The fuel and blanket subassemblies were shipped off-site in 1973. Following that, the secondary sodium system was drained and sent off-site. The radioactive primary sodium was stored on-site in storage tanks and 55 gallon (gal) drums until it was shipped off-site in 1984. The initial decommissioning of Fermi 1 was completed in 1975. Effective January 23, 1976, DPR-9 was transferred to the Detroit Edison Company (DTE) as a 'possession only' license (DTE 2010a). This report details the confirmatory activities performed during the second Oak Ridge Institute for Science and Education (ORISE) site visit to Fermi 1 in November 2010. The survey was strategically planned during a Unit 2 (Fermi 2) outage to take advantage of decreased radiation levels that were observed and attributed to Fermi 2 from the operating unit during the first site visit. However, during the second visit there were elevated radiation levels observed and attributed to the partially dismantled Fermi 1 reactor vessel and a waste storage box located on the 3rd floor of the Fermi 1 Turbine Building. Confirmatory surveys (unshielded) performed directly in the line of sight of these areas were affected. The objective of the confirmatory survey was to verify that the final radiological conditions were accurately and adequately described in Final Status Survey (FSS) documentation, relative to the established release criteria. This objective was achieved by performing document reviews, as well as independent measurements and sampling. Specifically, documentation of the planning, implementation, and results of the FSS were evaluated; side-by-side FSS measurement and source comparisons were performed; site areas were evaluated relative to appropriate FSS classification; and areas were assessed for residual, undocumented contamination.« less
  • The purpose of Experiment 2018 was to achieve a hydraulic connection between EE-2 and EE-3 in the region just below their respective casing shoes. To protect the cassing of EE-2, the fracturing fluid had to be pumped down a 3-1/2 inch drill string to an Otis casing packer set 240 ft above the casing shoe of EE-2. Pumping started at 16:23 of July 19, 1982, and was terminated at 2:02 on July 20, 1982, due to hardware failure, after some trouble with the setting of the casing packer had delayed the beginning of the experiment for approximately two days. Priormore » to the experiment, a sand plug in EE-2 had been set, with its top at 11,910 ft (all depths referenced her are cable depths). A total of 5,698 bbls had been pumped. No hydraulic connection appeared at the end of Experiment 2018.« less