Document: NUREG-0800
Document ID: 8dd882f4-a34f-4415-acd1-ebb441c72786
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1213/ML12132A481.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
AP (details of the operational phase are provided in SRP Section 17.6). If the PRA lacks sufficient quantitative results to determine target values, the applicant should describe adequately how expert judgment will establish reliability and availability goals. How the applicant will carry out performance monitoring for diverse backup systems (if necessary) and DI&C systems should be clearly explained. These specified values should be defined to help ensure that no safety conclusions based on review of the risk analysis of the DI&C are compromised once the plant is operational. Coordinate this review with NRC staff evaluating the levels of diversity and defense-in-depth (D3) in the 19.0-34 Draft Revision 3 – September 2012 DI&C system. An implementation and monitoring program should address how the applicant will ensure that the design continues to reflect the assumed reliability of the systems and components during plant operation. Severe Accident Evaluation (FSAR Section 19.2) 1. The staff reviews the applicant’s description and analysis of the design features to prevent and mitigate severe accidents, in accordance with the requirements in 10 CFR 52.47(23) or 10 CFR 52.79(a)(38), for a DC or a COL application, respectively. This review should specifically address the issues identified in SECY-90-016 and SECY-93-087 (listed with their SRMs above) for prevention (e.g., anticipated transients without scram, midloop operation, station blackout, fire protection, and intersystem loss-of-coolant accident) and mitigation (e.g., hydrogen generation and control, core debris coolability, high-pressure core melt ejection, containment performance, dedicated containment vent penetration, equipment survivability). 2. The staff reviews the information provided by the applicant to satisfy the requirements of 10 CFR 52.47(8) or 10 CFR 52.79(a)(17), for a DC or a COL application, respectively. In particular, both regulations invoke 10 CFR 50.34(f)(1)(i) to specify that a design-