Document: NUREG-0800
Document ID: e32f0820-4e33-476e-aa36-4ca8c2c64af0
Document Type: srp
Title: Use of Probabilistic Risk Assessment in Plant-Specific, Risk-Informed Decisionmaking:
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0119/ML011940192.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
pecific SRP chapters (where available) provide additional guidance in this area. I1. ACCEPTANCE CRITERIA SRP 19-4 This SRP chapter provides guidance for use in conducting staff reviews of PRA findings and risk insights in support of licensees' requests for changes to the LB of nuclear power plants (e.g., requests for license amendments under 10 CFR 50.90, and exemptions under 10 CFR 50.11). RG 1.174 sets forth guidance for licensees to use in implementing acceptable methods for conducting PRA and traditional engineering analyses to support such changes. To evaluate licensee-initiated LB changes which are consistent with currently approved staff positions (e.g., regulatory guides, standard review plans, or branch technical positions), the staff normally uses traditional engineering analyses. Licensees generally would not be expected to submit risk information in support of such proposed changes. However, circumstances may arise in which new information reveals an unforeseen hazard or a substantially greater potential for a known hazard to occur, even when all regulatory requirements are met. In such situations, the NRC has the statutory authority to require licensee action above and beyond existing regulations to maintain the level of protection necessary to avoid undue risk to public health and safety. The use of risk information in the review of such license amendment requests is addressed in Appendix D of this SRP chapter. To evaluate licensee-initiated LB changes which go beyond current staff positions, the staff may use traditional engineering analyses as well as the risk-informed approach set forth in this SRP chapter. In such instances, licensees may be requested to submit supplemental risk information or traditional engineering information if such information is not already included as part of the original submittals. If risk information on the proposed LB changes is not provided, the staff will determine if the application can be approved on the basis of the