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Title: Update Shell Inspection Project

 [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Spring Meeting IMOG-MTS ; 2017-04-18 - 2017-04-20 ; Livermore, California, United States
Country of Publication:
United States
CMM shell inspection

Citation Formats

Vigil, Anthony Eugene, Ledoux, Reina Rebecca, Gonzales, Antonio R., Randles, Wayne Alfred, Montano, Joshua Daniel, and Savage, Lowell Curtis. Update Shell Inspection Project. United States: N. p., 2017. Web.
Vigil, Anthony Eugene, Ledoux, Reina Rebecca, Gonzales, Antonio R., Randles, Wayne Alfred, Montano, Joshua Daniel, & Savage, Lowell Curtis. Update Shell Inspection Project. United States.
Vigil, Anthony Eugene, Ledoux, Reina Rebecca, Gonzales, Antonio R., Randles, Wayne Alfred, Montano, Joshua Daniel, and Savage, Lowell Curtis. Tue . "Update Shell Inspection Project". United States. doi:.
title = {Update Shell Inspection Project},
author = {Vigil, Anthony Eugene and Ledoux, Reina Rebecca and Gonzales, Antonio R. and Randles, Wayne Alfred and Montano, Joshua Daniel and Savage, Lowell Curtis},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 09 00:00:00 EDT 2017},
month = {Tue May 09 00:00:00 EDT 2017}

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  • Since the last project update in FY16:Q2, PF-WFS personnel have advanced in understanding of shell inspection on Coordinate Measuring Machines {CMM} and refined the PF-WFS process to the point it was decided to convert shell inspection from the Sheffield #1 gage to Lietz CM Ms. As a part of introspection on the quality of this process many sets of data have been reviewed and analyzed. This analysis included Sheffield to CMM comparisons, CMM inspection repeatability, fixturing differences, quality check development, probing approach changes. This update report will touch on these improvements that have built the confidence in this process tomore » mainstream it inspecting shells. In addition to the CMM programming advancements, the continuation in refinement of input and outputs for the CMM program has created an archiving scheme, input spline files, an output metafile, and inspection report package. This project will continue to mature. Part designs may require program modifications to accommodate "new to this process" part designs. Technology limitations tied to security and performance are requiring possible changes to computer configurations to support an automated process.« less
  • Manually applied ultrasonic (UT) weld flaw evaluation of size and shape requires well trained, experienced operators. Available automated ultrasonic (AUT) systems simplify evaluation by producing a real-time hard copy of the flaw parameters. The same instrumentation can also be applied for thickness mapping of vessels for corrosion surveys. UT flaw evaluation also requires the operator to determine whether a flaw is critical (cracklike) or benign (rounded, irregular) since cracks generally must be removed and repairs made. Since operator flaw evaluation is prone to error, computerized flaw signature analysis methods applying measurements of UT signal rise time, fall time and pulsemore » width are successfully being applied to sort cracks from benign flaws. An experimental technique, currently under development, involves the use of impact analysis to locate corrosion in piping. The method is applied by local excitation (impacting) the pipe along its length; recording the resulting noise signal and analysis of this signature for frequencies characteristic of vibration modes related to the wall thickness near the point of impact. Others have used this technique on large structures (oil rigs, drill platforms, bridges, etc.) to locate cracked or missing members. Several promising laboratory tests have been conducted, however, additional effort is required to evaluate the effects of pipe size, insulation, support location, etc. on the capabilities of this test method.« less
  • The scope for ASME Section XI ISI programs is largely based on deterministic results contained in design stress reports. These reports are normally very conservative and may not be an accurate representation of failure potential. Service experience has shown that failures are due to either corrosion or fatigue and typically occur in areas not included in the plant`s ISI program. Consequently, nuclear plants are devoting significant resources to inspection programs that provide minimum benefit. As an alternative, significant industry attention has been devoted to the application of risked-based selection criteria in order to determine the scope of inservice inspection (ISI)more » programs at nuclear power plants. Preliminary EPRI studies indicate that the application of these techniques will allow operating nuclear plants to reduce the examination scope of current ISI programs by as much as 60 to 80%, significantly reduce costs, and continue to maintain high nuclear plant safety standards.« less
  • The U.S. Department of Energy's Office of Security Evaluations (OSE) is responsible for inspecting and evaluating safeguards and security measures at Department of Energy facilities. During the past year, OSE has implemented significant organizational and procedural changes that are of interest to the safeguards and security community. This paper describes these changes in the inspection program and their current and projected impacts on efforts to maintain effective and dynamic protection programs throughout the Department of Energy.