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:
uirement (e.g., component boundaries have not been defined anywhere), then the requirement has not been met. In either case, the instances of noncompliance with the PRA standard requirements are to be (1) rectified or demonstrated not to be relevant to the application and (2) documented. Further, the technical requirements may be defined at two different levels: (1) high-level requirements and (2) supporting requirements. High-level requirements are defined for each technical element and capture the objective of the technical element. High-level requirements are defined in general terms, should be met regardless of the capability category, and accommodate different approaches. Supporting requirements are defined for each high-level requirement and are the minimal requirements needed to satisfy the high-level requirement. Consequently, a determination of whether a high-level requirement is met is based on whether the associated supporting requirements are met. Whether every supporting requirement is needed for a high-level requirement depends on the application and is determined by the application process requirements. All supporting requirements related to NDMs are applicable for peer review of NDMs. DG-1362, Page 41 2.2 Industry Peer Review Program A peer review of the PRA is performed to determine whether the requirements established in the national consensus PRA standard, as endorsed by the NRC with exceptions and clarifications, have been met. An acceptable peer review approach is one that is performed according to an established process and by qualified personnel and documents the results and identifies both strengths and weaknesses of the PRA. The ASME/ANS Level 1/LERF PRA standard requires a peer review to be performed on the base PRA model, any PRA upgrades, and on the use of any NDMs. The ASME/ANS Level 1/LERF PRA standard provides requirements for (1) the establishment of a peer review process, and (2) PRA peer review team qualifications and documentation.