Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
s. Additionally, in November 2017, ASME and ANS jointly issued ASME/ANS RA-S Case 1, “Case for ASME/ANS RA-Sb-2013 Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment of Nuclear Power Plant Applications,” which provides a proposed alternative set of requirements related to the requirements for seismic PRA in Part 5 of ASME/ANS RA-Sa-2009. Appendix B of this RG provides the staff endorsement, with exceptions and clarifications, of the requirements for seismic PRA in ASME/ANS RA-S Case 1. Similar to the staff endorsement of the ASME/ANS Level 1/LERF PRA standard, the staff endorsement, with exceptions and clarifications, on ASME/ANS RA-S Case 1 is based on the staff’s review the seismic PRA requirements in ASME/ANS RA-S Case 1 against the related regulatory position in Section C of this RG. A PRA peer review process was developed and has been applied by reactor owners’ groups and other industry organizations for several years. The Nuclear Energy Institute (NEI) issued the PRA peer review guidance document NEI 17-07, Revision 2, “Performance of PRA Peer Reviews Using the ASME/ANS PRA Standard,” which provides guidance on how to perform a PRA peer review to meet the PRA peer review requirements in the ASME/ANS Level 1/LERF PRA standard. Consistent with the scope of the ASME/ANS Level 1/LERF PRA standard, NEI 17-07, Revision 2, addresses PRA peer reviews for internal and external hazards as well as follow-on PRA peer reviews. The regulatory position in C.2.2 on NEI 17-07, Revision 2, of this guide endorses, with clarifications, NEI 17-07, Revision 2, in its entirety as a means of satisfying the peer review requirements in the ASME/ANS Level 1/LERF PRA standard, as endorsed by the NRC in this guide with staff exceptions and clarifications. The following are other related NEI guidance documents on PRA peer review from which NEI 17-07, Revision 2, was developed: • NEI 00-02, “Probabilistic Risk Assessment Peer Review Process