Document: NRC Regulatory Guide
Document ID: 8a2332d3-66ca-40af-84e1-507db8b26559
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:
d submittal documentation that should otherwise be achieved. C.4.1 Archival Probabilistic Risk Assessment Documentation Certain generic characteristics and attributes of archival PRA documentation are fundamental to the staff’s assessment of PRA acceptability and should be achieved during the creation of that documentation by an applicant or holder of a license, certification, or permit in the absence of application- specific guidance. As part of achieving these characteristics and attributes, the archival PRA documentation should include a detailed description of the following: • The process used to determine the acceptability of the PRA, including a description of how the staff position in this RG is met, should be included. The description should state whether a national consensus standard was used and whether the technical requirements in that standard are met. o If a national consensus standard was used as part of demonstrating PRA acceptability, the documentation should show that the PRA was developed consistently with that standard, as endorsed by the NRC in this RG. o If a national consensus standard was not used or was used in part to demonstrate PRA acceptability, justification should be developed for each requirement from the related national consensus standard that is not met to explain why not meeting the requirement is acceptable. This justification should include sensitivity studies demonstrating that the event sequences or significant contributors to the application are not adversely impacted. RG 1.247, Page 64 The documentation should also describe the following: • the methodology used to assess the risk of the application, including details of how the risk was quantified and identification and justification of all assumptions and approximations used to develop or evaluate the PRA; • SSCs, operator actions, and plant operational characteristics affected by the application, including the cause-effect relationships among SSC behavior, operator