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
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Content:
of risk-informed decisionmaking, the NRC will rely on the approach discussed in this chapter. Above all, the design, construction, and operational practices of each plant are expected to be consistent with its LB. In addition, the risk evaluations performed to justify regulatory changes are expected to realistically reflect these plant-specific design, construction, and operaitional practices. The PRA analyses should be as realistic as practicable and, when interpreting the results of those analyses, the staff should account for the impact of the most significant uncertainties. The results of these risk analyses will then form part of the input to the decisionmaking process that evaluates the margin in plant capability (in both performance and redundancy/diversity). Specifically, the decisionmaking process will use the results of the risk analyses in a manner that complements traditional engineering approaches, supports the defense-in-depth philosophy, and preserves safety margins. Thus, risk analysis will inform, but it will not determine regulatory decisions. REVIEW RESPONSIBILITIES The technical nature of a licensee's request will determine which technical review branch in the NRC's Office of Nuclear Reactor Regulation (NRR) will serve as the primary review branch and as such, has overall responsibility for leading the technical review, drafting the staff safety evaluation report (SER) or other appropriate regulatory document, and coordinating input from other technical review organizations. In addition, the following organizations will normally play a role in reviewing risk-informed proposals: The Probabilistic Safety Assessment Branch (SPSB) assists the primary review branch (upon request) by reviewing the PRA information and findings submitted by the licensee. Review support includes assessing the adequacy of the scope, level of detail, and quality of the PRA used by the licensee to support the regulatory change, as well as applying risk-related acceptance