Document: NUREG-0800
Document ID: ac43f632-9db1-4857-9f56-bfba45965456
Document Type: srp
Title: * These are modifications to a plant’s design, operations, or other activities that require NRC approval. These modifica
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0232/ML023250195.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19
CFR Part: 
CFR Title: 

Content:
d regulation (RIR), licensee submittals are expected to utilize an integrated process that combines risk insights from a PRA, together with insights 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. 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, staff 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 application-specific SRP chapters (where available) and by the cause-effect relationship described in Section III.2.2.1 of this SRP chapter. For additional background on the PRA review, the reader is referred to the bibliography provided in Section A.11 of this appendix. A.1 Initiating Event Analysis a. Areas of Review Whether or not a PRA includes a particular