Weld Residual Stress Finite Element Analysis Validation: Part II—Proposed Validation Procedure – Draft Report for Comment (NUREG-2228)

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Publication Information

Manuscript Completed: January 2020
Date Published: July 2020

Prepared by:
M. Benson
P. Raynaud
J. Wallace

Michael Benson, NRC Project Manager

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

Under a Memorandum of Understanding, the U.S. Nuclear Regulatory Commission and the Electric Power Research Institute conducted a research program aimed at gathering data on weld residual stress modeling. As described in NUREG-2162, "Weld Residual Stress Finite Element Analysis Validation: Part I—Data Development Effort," issued March 2014, this program consisted of round robin measurement and modeling studies on various mockups. At that time, the assessment of the data was qualitative. This report describes an additional residual stress round robin study and a methodology for capturing residual stress uncertainties. This quantitative approach informed the development of guidelines and a validation methodology for finite element prediction of weld residual stress. For example, comparisons of modeling results to measurements provided a basis for establishing guidance on a material hardening approach for residual stress models. The proposed validation procedure involves an analyst modeling a known case (the Phase 2b round robin mockup) and comparing results to two proposed quality metrics. These recommendations provide a potential method by which analysts can bolster confidence in their modeling practices for regulatory applications.