Document: NRC Regulatory Guide
Document ID: 2704425a-c58a-45c4-93ab-8761721c3e7a
Document Type: regulatory_guide
Title: Evaluation of Reactor Pressure Vessels with Charpy Upper-Shelf Energy Less Than 50 Ft-Lb
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740038.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.161
CFR Part: 
CFR Title: 

Content:
roup to modify Appendix K to include the missing procedures and data. However, given the number of plants that could need the guidance in the near term, and given the ASME codification process and the NRC's process for endorsing ASME documents, the time needed to modify and endorse Appendix K was judged to be excessive,. The efficacy cdw procedures in the regulatory guide was demonstrated by generic bounding calculations3 performed by the NRC staff in preparing SECY-93-048. These calculations demonstrated that the requirement in Appendix 0 to 10 CFR Part 50 to demonstrate margins equivalent to those in Appendix O to Section Ill to the ASME Code could be satisfied for materials with Charpy upper-shelf energy less than 50 ft-lb for all the generic vessel geometries and material combinations considered. 3 Charles Z. Seapan. Jr., NRC, Memorandum to Jack Stunider, NRC, January 15, 1993, "Generic Bounding Analyses for Evaluation of Low Charpy UperýME .ffeon Safety Margi Against Fracture of RPV Beltine Plate and Weld Materials', Charles Z. Serpan Jr.. NRC. Memorandum to Jack Strmider, NRC, Fdxuay s, 1993, "Additional hrmation Regarding Results of Generic Bounding Analyses for Evaluation of Pressure Vessels Fabrcated Using Low ChaW Uppr-Shelf Energy Materials." Copies are available for inspection or copying for a fee firom the NRC Public Document Room at 2120 L Street NW., Washington, DQ, the PDR's mailing a is Mail Stop .L6. Washington. DC 20555; telepo (202)634-3273; fax (202)634-3343. R-2 The regulatory guide acce-,.snce criteria were taken directly from the ASME efforts. The criteria were developed by the ASME Code Section XI working group over an I I-year period and represent the collective judgment of a body of cxerts representing the NRC stafl research contractors, nuclear utilities, nuclear power plant vendors, consultants, and S academia. Similarly, the evaluation procedures for Service Levels A and B were developed by this group. The procedures in the regulatory