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:
or Applicant Submittal Documentation To demonstrate that the acceptability of the PRA used in an application is sufficient, for applications that require prior NRC approval, the following information will be submitted to the NRC. Previously submitted documentation may be referenced if it is acceptable for the subject submittal: DG-1362, Page 51 • Information to assure that the PRA model represents the as-designed or as-built and as-operated plant. o Identify permanent plant changes (such as design or operational practices) that have an impact on those things modeled in the PRA but have not been incorporated in the base PRA model. If a plant change has not been incorporated, the provide a justification of why the change does not impact the PRA results used to support the application. This justification should be in the form of a sensitivity study that demonstrates the accident sequences or contributors significant to the application decision were not adversely impacted (remained the same). • Documentation that the portions of the PRA required to produce the results used in the decision are performed consistently with the standard as endorsed with exceptions and clarifications in the Appendices of this RG. If a requirement of the standard (as endorsed with exceptions and clarifications in the Appendix to this guide) has not been met, provide a justification of why it is acceptable that the requirement has not been met. This justification should be in the form of a sensitivity study that demonstrates the accident sequences or contributors significant to the application were not impacted (remained the same). • A summary of the risk assessment methodology used to assess the risk of the application, including how the base PRA model was modified to appropriately model the risk impact of the application and results (note that this is the same as that required in the application-specific RGs). • Identification of the key assumptions and approximations relevant to