Document: NUREG-0800
Document ID: 4f0d611c-d3fb-43e5-ab91-e7f7b4de3511
Document Type: srp
Title: Determining the Technical Adequacy of Probabilistic Risk
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0406/ML040630300.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
CFR Part: 
CFR Title: 

Content:
P Chapter 19 (Ref. 12). These documents make it clear that PRA information is one input into making a decision. Specifically, the decision-making process will use the results of the risk analyses in a manner that complements traditional engineering approaches, supports the defense-in-depth philosophy, and preserves safety margins. Thus, risk analysis will inform, but it will not determine regulatory decisions. This SRP chapter concerns any licensee request submitted for NRC review and approval for which PRA can play an effective role in the decision-making process. It will be used to support application-specific SRP chapters that provide guidance for several activities, including the following examples: • changes to a plant’s licensing basis (SRP Chapter 19) (Ref. 13) • changes to allowed outage times and surveillance test intervals in plant-specific technical specifications (SRP Chapter 16.1) (Ref. 14) • changes in the scope and frequency of tests on pumps and valves in a licensee's inservice test program (SRP Chapter 3.9.7) (Ref. 15) • changes in the scope and frequency of inspections in a licensee's inservice inspection program (draft SRP Chapter 3.9.8) (Ref. 16). The above documents address reviewing the application in terms of the following: 3 • the structures, systems, and components (SSCs); operator actions; and plant operational characteristics affected by the application • the description of the cause-effect relationships between the change and the above SSCs, operator actions, and plant operational characteristics • mapping of the cause-effect relationships onto PRA model elements • identification of the PRA results that will be used in the decision making • the scope of risk contributors needed to support the decision The documents also address issues related to limitations in scope of the PRA, etc. However the PRA results are used, and whatever role they play in the decision making, the PRA analysis must be of sufficient quality to