Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
and risk information, and may be based on qualitative factors as well as quantitative analyses and information.” • The recognition that the PRA developed to support regulatory decisions (i.e., as derived from the base PRA) can vary in terms of the scope, level of detail, and the level of conformance with the technical elements in a PRA standard. The PRA is to be commensurate with the application for which it is intended and the role the PRA results play in the integrated decisionmaking process. DG-1362, Page 10 For some applications and decisions, only specific portions of a base PRA may need to be used. In other applications, the full-scope base PRA may need to be used. General guidance regarding the appropriate scope, requirements to be met in national consensus PRA standards, level of detail, and plant representation for a PRA used in a specific application is provided in the related application-specific guidance documents for those activities. Harmonization with International Standards The NRC has a goal to harmonize its regulatory guidance with international standards, to the extent practical. Relative to this RG, the International Atomic Energy Agency (IAEA) has established a safety standards series that address good practices in aspects of probabilistic safety similar to certain elements and principles of this RG. The IAEA safety guides present international good practices to help users to achieve high levels of safety. The information in this RG is generally consistent with the principles in the below IAEA documents: • IAEA Safety Standards Series No. SSG-3, “Development and Application of Level 1 Probabilistic Safety Assessment for Nuclear Power Plants” (Ref. 36) • IAEA Safety Standards Series No. SSG-4, “Development and Application of Level 2 Probabilistic Safety Assessment for Nuclear Power Plants” (Ref. 37) These safety guides provide recommendations for performing or managing a probabilistic safety assessment for nuclear power plants