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:
evel 1/LERF PRA standard. The staff finds the recommended peer review requirements to be appropriate for the F&O independent assessment process. For a focused-scope peer review, all the applicable SRs under any high-level requirement (HLR) should be included in the scope of the focused-scope peer review for any HLR with one or more SRs that received a Finding from the prior peer review. DG-1362, Page 45 The implementation of this staff position is intended to provide the needed confidence in the resolution of peer review F&Os against the requirements in the national consensus PRA standard such that, when used in support of an application, the implementation of the staff position will obviate the need for an in-depth review of the licensee’s F&O resolutions by NRC reviewers. This allows the staff to focus their review on key assumptions and areas identified by PRA peer reviewers as being of concern and relevant to the application. However, the staff may choose to observe an F&O independent review process or audit an F&O independent assessment closure report. NRC Endorsement of Industry Guidance Documents NEI 17-07, Revision 2, provides guidance on conducting and documenting a PRA peer review, including peer reviews of NDMs for acceptability and for implementation in a PRA, follow-on peer reviews, and the closure of F&Os that result from a peer review. The NRC staff has reviewed NEI 17-07, Revision 2, against the characteristics and attributes for an acceptable PRA peer review process in regulatory position C.2.2 through C.2.2.3 with respect to the peer review process for the following: • a base PRA model • a PRA upgrade • use of an NDM • independent assessment for the closure of peer review F&Os The NRC staff endorses, with clarifications, NEI 17-07, Revision 2, as a means of satisfying the peer review requirements in ASME/ANS RA-Sa-2009 and for the purpose of meeting regulatory position C.2 of this RG. The NRC staff has endorsed ASME/ANS RA-Sa-2009 in