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:
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 findings are defensible. Descriptions of the qualifications of the peer review team members and the peer review process should be documented. The results of the peer review for each technical element and the base PRA update process are described, including the areas in which the base PRA does not meet or exceed the desired characteristics and attributes used in the review process. This includes an assessment of the importance of any identified deficiencies in the base PRA results and how these deficiencies were addressed and resolved. Table 17 summarizes the characteristics and attributes needed for an acceptable PRA peer review process. These characteristics and attributes are applicable to the types of PRA peer review discussed in regulatory positions C.2.2.1 through C.2.2.3. Table 17. Summary of the Characteristics and Attributes of a PRA Peer Review Element Characteristics and Attributes Peer Review Process • Uses documented process • Uses as a basis for review a set of desired PRA characteristics and attributes • Uses a minimum list of review topics to ensure coverage, consistency, and uniformity • Reviews PRA methods (NDMs, as defined in the Glossary of this RG, should be reviewed against the NDMs requirements referenced in regulatory position C.2.2.2.2) • Reviews application of methods • Reviews assumptions and assesses their validity and appropriateness • Determines if PRA represents as-built and as-operated plant or the as-to-be-built and as-to-be-operated plant in the case of a DC or COL application. • Performs independent walkdowns of the plant to confirm PRA inputs • Reviews results of each PRA technical element for reasonableness • Reviews PRA maintenance and update process • Reviews PRA modification attributable to use of different