Document: NUREG-0800
Document ID: b8d2b8f5-432a-4c0a-81ab-20231f7d0f28
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1508/ML15089A068.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
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Content:
validity of the staff findings associated with the licensing basis related to PRA and severe accidents. The purpose of the staff’s review is to ensure that the applicant has adequately addressed the Commission’s objectives regarding the appropriate way to address consideration of severe accidents and the use of PRA in the design and operation of facilities under review. These objectives are outlined in RG 1.206, “Combined License Applications for Nuclear Power Plants (LWR Edition),” Section C.I.19.2 and should be addressed in Section 19.1.1 of the applicant’s final safety analysis report (FSAR). The scope of a DC review is limited to the design-specific aspects within the scope of the design certification. The design-specific PRA developed during the DC stage may not identify site- specific information (e.g., local hazards, switchyard and offsite grid configuration, and ultimate heat sink) and may not explicitly model all aspects of the design (e.g., balance of plant). A seismic PRA cannot be performed without a site-specific probabilistic seismic hazard analysis (PSHA) and as-built information. Consequently, a PRA-based seismic margin analysis (SMA) is acceptable. This SRP provides guidance for reviewing PRA-based SMA submitted in support of a DC or COL application. DC/COL-ISG-20 (Ref. 14) discusses post-DC activities to update the PRA-based SMA throughout the licensing process of new reactors, including COL action items and post-licensing activities, to ensure a coherent and consistent process for the quality of PRA-based SMA to adequately meet Title 10 of the Code of Federal Regulations (10 CFR) 52.47(a)(27), 10 CFR 52.79(a)(46), 10 CFR 52.79(d)(1), and 10 CFR 50.71(h). The applicant’s design-specific PRA may include assumptions regarding site parameters and the interfaces with undeveloped aspects of the design. This is acceptable at the DC stage and results in the identification of PRA-based insights that include design, site, and operational