Document: NUREG-0800
Document ID: 32179098-f78d-4852-9c29-1e5e3abb2705
Document Type: srp
Title: RISK-INFORMED DECISION MAKING:  TECHNICAL SPECIFICATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380228.pdf
Revision Date: 2023-06
Chapter: 16
Section ID: 16.1
CFR Part: 
CFR Title: 

Content:
r both from the requested TS change, the more rigor must go into 16.1-15 Revision 1 - March 2007 ensuring PRA quality. One approach to ensure quality is a peer review of the PRA. The submission should document the review process, the qualifications of the reviewers, a summary of the review findings, and resolutions for these findings when applicable. Industry PRA certification programs and PRA cross-comparison studies also may help ensure appropriate scope, level of detail, and PRA quality. A program or study description, including the approach and standard or guidelines to which the PRA is compared; the depth of the review; and the make-up and qualifications of the personnel involved should be submitted for NRC review. Based on the findings of the peer review or other certification process the licensee should explain why the PRA is adequate for the TS application in scope and quality. A peer review, certification, or cross-comparison would not replace a staff review but the more confidence the staff has in the licensee’s PRA the less rigorous may be the staff review. For most TS reviews, demonstration of PRA quality by an industry certification or cross-comparison process combined with a focus-scoped staff review, should be sufficient. Cross-comparisons are most appropriate when the system designs are similar across the plants compared. Some licensees may elect to use the PRA underlying their IPE to analyze the risk impact of requested TS changes. The staff's review of the IPE alone is not an adequate review for TS applications. (b) Scope. A full-scope (Level 3) PRA is not needed for TS evaluations and in most cases a Level 2 PRA with external events for all modes of operation is not required for TS change applications. As a minimum, for systems that prevent core damage (i.e., most of the TS systems modeled in a PRA other than the containment systems), Level I evaluations are needed. For containment systems, Level 2 evaluations are likely to be needed at least to