Document: NUREG-0800
Document ID: 7916b088-fb90-4163-84fe-027bd315bcc5
Document Type: srp
Title: REVIEW OF RISK INFORMATION USED TO SUPPORT PERMANENT PLANT-
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700658.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.2
CFR Part: 
CFR Title: 

Content:
cument displays a currently valid OMB control number. APPENDIX A Guidance for a Focused-Scope Application-Specific PRA Review As stated in SRP 19.2, Subsection III.2.2.4 and in Regulatory Guide 1.174, Section 2.2.3 PRAs that are used in risk-informed submittals to determine risk significance or risk impact should be shown to be of adequate quality. In risk-informed regulation (RIR), licensee submittals are expected to utilize an integrated process that combines risk insights from a PRA, together withinsights from traditional engineering analyses, supported by performance monitoring and feedback. The quality of the PRA required to support this process is commensurate with the roles the risk insights play in the final decisionmaking. The staff evaluation of a licensee’s risk-informed application submittal is expected to include a review of the licensee’s process for PRA quality assurance. Where necessary, this should be supplemented by a general review of the event and fault tree models, data on SSC failures and common cause failures, mission success criteria, initiating event analysis, human reliability analysis, and sequence quantification including the analysis of uncertainties. These reviews should be sufficiently detailed to give the staff confidence that the PRA appropriately reflects the plant’s design and actual operating conditions and practices. Results from previous staff reviews (e.g., from prior applications or from IPE/IPEEE reviews) and from industry reviews (e.g., from independent peer reviews, certification processes, or cross comparisons) should be used, as appropriate. In addition to the general overall review described above, reviewers are expected to perform a focused-scope review of the risk analysis on an application-specific basis. This appendix provides review guidance for the likely elements of a PRA that may affect or be affected by proposed changes to the LB. Reviewers should choose the relevant parts of this appendix, guided by the