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
CFR Part: 
CFR Title: 

Content:
generic data) e. Data for CCF meet the above criteria in Ha to Hd. (Applies to both component-specific and generic data, as appropriate) f. Data for fault coverage meet the above criteria in Ha to Hd. (Applies to both component-specific and generic data, as appropriate) g. Documentation is included on how the basic event probabilities are calculated in terms of failure rates, mission times, and test and maintenance frequencies. (Applies to both component-specific and generic data) I. The use of DI&C systems in nuclear power plants raises the issue of dynamic interactions, specifically: a. The interactions between a plant system and the plant’s physical processes, (i.e., the value of process variables), and b. The interactions within a DI&C system (e.g., communication between different components, multi-tasking, multiplexing, etc.). The reviewer should confirm that interactions have been addressed in the PRA model for DI&C systems or should evaluate the rationale for not modeling them. J. Target reliability and availability specifications should be described adequately for the operational phase of D-RAP (details of the operational phase are provided in SRP Sections 17.4 and 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 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