Document: NRC Regulatory Guide
Document ID: 82659041-98b0-4721-b25d-c4fb2ea394d0
Document Type: regulatory_guide
Title: An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1635/ML16358A153.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.174
CFR Part: 
CFR Title: 

Content:
e Submittal Documentation To support the NRC staff’s conclusion that the proposed licensing basis change is consistent with the key principles of risk-informed regulation and NRC staff expectations, the licensee should submit the following information: • A description of how the proposed change impacts the licensing basis. This relates to the risk-informed decisionmaking principle that the licensing basis changes meet regulations. • A description of the components and systems affected by the change, the types of changes proposed, the reason for the changes, and results and insights from an analysis of available data on equipment performance. The staff expectation is that all safety impacts of the proposed licensing basis change should be evaluated. • A reevaluation of the licensing basis accident analysis and the provisions of 10 CFR Part 20, “Standards for Protection against Radiation” (Ref. 43), and 10 CFR Part 100, “Reactor Site Criteria” (Ref. 44), if appropriate. This relates to the risk-informed decisionmaking principles of the licensing basis changes meeting the regulations, sufficient safety margins are maintained, and consistency with the defense-in-depth philosophy is maintained. • An evaluation of the impact of the licensing basis change on the breadth or depth of defense-in-depth attributes of the plant. This relates to the risk-informed decisionmaking principle that the proposed licensing basis change maintains consistency with the defense-in-depth philosophy. • Identification of how and where the proposed change will be documented as part of the plant’s licensing basis (e.g., FSAR, technical specifications, licensing conditions). This should include proposed changes or enhancements to the regulatory controls for high- DG-1285, Page 42 risk-significant SSCs that are not subject to any requirements or the requirements are not commensurate with the SSC’s risk significance. The licensee should also identify: • Key assumptions in