Document: NUREG-0800
Document ID: 0d034ca5-ee9b-43ca-a6d6-b08e537d605b
Document Type: srp
Title: Determining the Technical Adequacy of Probabilistic Risk
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0625/ML062510220.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
CFR Part: 
CFR Title: 

Content:
ter 3.9.7) (Ref. 15) 4 • 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: • 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 support that role. The existing SRP chapters give guidance on assessing the analysis of the impact of the change on the PRA results, but do not give specific guidance on assessing the adequacy of the base PRA. Regulatory Guide 1.200 and this SRP are intended to fill that gap. This SRP provides guidance to the NRC staff on determining the scope of review of the elements of a PRA analysis used to support a specific regulatory application, based on information provided by the licensee on the results of a comparison with an industry PRA standard or the results of a peer review performed in accordance with an industry approved peer review process. This SRP chapter is intended to be used in conjunction with an application-specific SRP such as SRP Chapter 19 (Ref. 13) or Chapter 3.9.8 (Ref. 16), which focus on the appropriate use of the PRA results in an integrated decision-making process. This SRP chapter may also be used to support novel applications in which the licensee is expected to identify how the PRA results are used to