Document: NRC Regulatory Guide
Document ID: 8a2332d3-66ca-40af-84e1-507db8b26559
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
assessment of the importance of any identified deficiencies in the PRA and its results and how these deficiencies should be addressed and resolved. A peer review of a PRA evaluates the PRA models for all radiological sources, all hazards, all POSs, and all levels of analysis needed for a given application. The peer review also examines the associated configuration control process, including processes for maintaining and upgrading the PRA. As part of quality assurance reviews of PRA documentation, the peer review should consider the principal elements of the types of quality assurance reviews performed in accordance with 10 CFR Part 50, Appendix B, “Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants.” This includes consideration of the following: • the use of qualified reviewers, • the use of reviewers who are independent of the original PRA development and any relevant upgrades of the PRA, • the list of issues to be addressed in the PRA, and • documentation of the review conclusions. Chapter 5 of NEI 20-09, Revision 1, identifies four main steps in the overall peer review process: • preparatory activities, • offsite review, • onsite consensus review, and • documentation of peer review results, including interaction with host user. Figure 1-1, “PRA Peer Review Process Flow Chart,” in NEI 20-09, Revision 1, depicts a PRA peer review framework outlining the approach and process steps used in a peer review for an individual PRA. The staff finds this process, in total, to be acceptable for a given peer review. The PRA peer reviewers assign CCs to each of the SRs of the various elements of the PRA standard to judge whether the PRA meets the SRs in the NLWR PRA standard within the scope of the review. A summary of the SR review is then provided for each HLR. The SRs define the minimum requirements necessary to meet each CC. Some of the SR action statements apply to only one CC, while others cover both CCs. When an