Document: NUREG-0800
Document ID: f60cdc8f-3c25-45c3-a1d3-b0f530961625
Document Type: srp
Title: DETERMINING THE TECHNICAL ADEQUACY OF PROBABILISTIC RISK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1219/ML12193A107.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
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Content:
ne that the approach used by the applicant is either equivalent to, or better than, that supported by the staff position. III. REVIEW PROCEDURES These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternative would provide an acceptable method of complying with the relevant NRC requirements. It should be clear that the elements of the model used to generate those results are of sufficient technical adequacy and that the assumptions and uncertainties that have the potential to affect the results have been properly evaluated and determined to be appropriate. III.1 Scope of Review In order to perform the review for PRA technical adequacy, the reviewer should first understand the context in which the PRA is being used. III.1.1 Use of the PRA in the Application The reviewer should become familiar with the way the PRA is used in the application. This includes understanding: • the SSCs, operator actions, and plant operational characteristics that are affected by or important to the application. • the cause-effect relationships between the change and the above SSCs, operator actions, and plant operational characteristics, where applicable. • the mapping of the cause-effect relationships onto PRA model elements, where applicable. • the acceptance criteria or guidelines, including identification of the PRA results that will be used to compare against the acceptance criteria or guidelines and how the comparison is to be made. 19.1- 5 Rev. 3 – September 2012 III.1.2 Scope of the PRA Model The reviewer should identify the scope of the PRA (i.e., risk measures, hazard groups, and modes of plant operation) based on the application. For example, if the application applies the acceptance guidelines of RG 1.174, the evaluations of core damage frequency (CDF), the change in CDF (ΔCDF), large early release frequency (LERF), and the