Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
x A to this RG. Such information should provide, for example, detailed descriptions of the NDM, assumptions, scope, limitations, data used along with the bases for data selection, technical bases, and equations developed or sponsored by the licensee or the applicant; and • the implementation of an NDM (e.g., self-assessment reports, peer review reports including the disposition of findings, independent assessment team closure report) that has been incorporated into the PRA under consideration. C.4.2 Submittal of Probabilistic Risk Assessment Documentation In addition to the characteristics and attributes of archival PRA documentation described in Regulatory Position C.4.1, submittal PRA documentation likewise has generic characteristics and attributes that are fundamental to the staff’s assessment of PRA acceptability for a given application. In the absence of application-specific guidance on submittal PRA documentation, these generic characteristics and attributes should otherwise be achieved during the creation of that documentation by an applicant or holder of a license, certification, or permit. As part of achieving these generic characteristics and attributes, the submittal PRA documentation should include the following: RG 1.247, Page 65 • demonstration that the PRA model represents the as-designed, as-to-be-built, and as-to-be-operated plant or the as-built and as-operated plant, which includes: o identification of permanent plant changes, such as design or operational practices, that have a potential impact on the PRA but that have yet to be represented in the PRA; o justification for why a permanent plant change does not impact the PRA results and insights used to support the application. This justification could be in the form of a sensitivity study demonstrating that the event sequences or contributors significant to the application were not impacted; o justification that the PRA has been performed in such a way that its results are acceptable,