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:
tion. The robustness of the results can be determined by developing an understanding of the contributors and the sources of uncertainty that impact the results. For the proposed risk change, reviewers should identify the elements that increase risk and those that decrease risk, and then identify the contributors to both the risk increase and decrease. A review of the basic events, assumptions, and. uncertainties involved in the increase and decrease in risk will help reviewers understand the elements that are important in determining the risk change, and thus ensure that the conclusions are robust with respect to the results obtained. In addition to the focused-scope review, reviewers should consider the following factors in determining the need for a more detailed and larger scope staff review of the PRA: The PRA results play a relatively significant role in the decisionmaking process, coupled with the finding that the proposed change in risk and/or the baseline risk is close to the decision guidelines as defined in Section 2.2.4 of RG 1.174. Staff audits of the licensee's process for conducting a PRA have identified practices that could detrimentally affect the quality of the technical analysis. Results of the licensee's analysis submitted in support of a licensing action are in some way counter-intuitive or inconsistent with results for similar plants on similar issues. * The licensee's analysis is part of a pilot application of PRA in a regulatory activity. SRP 19-17 -I * The PRA includes new methods that are unfamiliar to the staff. When a staff review o: the base PRA is necessary, reviewers should begin by evaluating the results and conclusions from available independent peer reviews of the PRA.2 The staff review should take into account the process used in the peer review (including the review guidelines or standards 1:o which the PRA is compared, the review scope and elements, the qualification and makeup of the review team, etc.). Results from previous