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:
Independent walkdowns are performed to confirm PRA inputs, especially for external hazard PRAs. Assumptions are reviewed to determine if they are appropriate and to assess their impact on the base PRA results. The base PRA results are checked for fidelity with the model structure and for consistency with the results from PRAs for similar plants based on the peer reviewer’s knowledge. Finally, the peer review process examines the procedures or guidelines established for updating the base PRA to reflect changes in plant design, operation, or experience. The process also provides criteria ensuring that the peer review is current. That is, (1) the peer review addresses the modifications made to the base PRA since any previous peer reviews, and (2) the peer review addresses modifications made to the standard since any previous peer reviews. The team qualifications determine the credibility and acceptability of the peer reviewers. To avoid any perception of a technical conflict of interest, it is best if the members of the peer review team be prohibited from peer reviewing any portion of the PRA on which they have performed or supervised work or on which a direct supervisor performed or supervised work. Each member of the peer review team has technical expertise in the PRA elements they review, including experience in the specific methods used to develop technical elements of the base PRA. This technical expertise includes experience in performing (not just reviewing) the work in the PRA technical element assigned for review. Knowledge of the key features specific to the plant design and operation is essential. Finally, each member of the peer review team should be knowledgeable about the peer review process, including the desired characteristics and attributes used to assess the acceptability of the base PRA. DG-1362, Page 42 Documentation provides the necessary information to ensure that the peer review process and the findings are traceable, and the bases of the