Document: NUREG-0800
Document ID: 05908428-2f08-4a4f-8512-996c29c86da8
Document Type: srp
Title: have been revised to address Addendum B of the ASME standard and the revised NEI
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700657.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
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CFR Title: 

Content:
to understand the scope of the PRA used in the decision making so that the appropriate appendices to Regulatory Guide 1.200 are identified as references for the review. III.1.3 Parts of the PRA Model Used in Application To assess the quality of the PRA input for a decision, the licensee identifies which parts of the PRA are used to provide the PRA results called for by the acceptance criteria. For license amendments these include not only the logic model events onto which the cause-effect relationships are mapped, but also all the events that appear together with those events in the affected accident sequences, and the parts of the analysis required to evaluate the necessary results. For some applications, this may be a limited set, but for others, e.g., risk-informing the scope of special treatment requirements, all parts of the PRA model are relevant. In addition, when the assessed impact of a proposed change, measured in terms of ΔCDF or ΔLERF, is greater than 1E-06/yr or 1E-07/yr respectively, the total CDF and LERF are required to be estimated, broadening the scope of review for technical adequacy. In applying this SRP section, the reviewer need only address those parts identified as being required to support the PRA results used. III.2 Assessment of the PRA The part of the PRA used for the application is assessed to determine whether it is of sufficient technical quality. There are two aspects to assessing the acceptability and adequacy of the PRA results. First, the underlying PRA must be technically sound. This implies that (1) the PRA model, or the parts of the model required to support the application, represent the as-built and as-operated plant, which in turn implies that the PRA is up to date and reflects the current design and operating practices, (2) the PRA logic model has been developed in a manner consistent with current good practice and it correctly reflects the dependencies of systems on one another and on operator actions, and (3) the