Document: NUREG-0800
Document ID: f60cdc8f-3c25-45c3-a1d3-b0f530961625
Document Type: srp
Title: DETERMINING THE TECHNICAL ADEQUACY OF PROBABILISTIC RISK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1219/ML12193A107.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
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assumptions. This is addressed primarily in the application-specific assessment through the use of sensitivity analyses. The staff should review the licensee’s basis for those assumptions and their justification, taking into account the peer reviewers’ assessment. The staff should determine whether the assumptions have been characterized appropriately, and whether there is sufficient information to conclude that the sensitivity studies performed to test the robustness of the conclusions are reasonable with respect to what is seen in current PRA practice. The staff’s focus should be on assessing the licensee’s approach to 19.1- 9 Rev. 3 – September 2012 the identification of the key assumptions, which are those made in response to key sources of uncertainty, and on assessing the appropriateness of the key assumptions.4 IV. EVALUATION FINDINGS If acceptable, the reviewer should provide documentation to conclude that the elements of the PRA relied upon to produce the results have been performed in such a way that the PRA results are fully supportable. IV.1 Assessment of PRA against the Endorsed Standards The PRA elements are assessed to determine whether they have been performed in a technically correct manner that conforms to the NRC endorsed PRA standards. This can be determined by an assessment of whether the PRA elements are performed consistent with the standard and peer review process as endorsed in the appendices to RG 1.200, or, if a discrepancy exists, whether the approach used is equivalent to, or better than that referenced in the standard or peer review process document. Alternatively, the reviewer may rely on a demonstration that the impact on the results used in the application is not significant. IV.2 Key Assumptions and Key Sources of Uncertainty The reviewer should not approve this portion of the analysis in the application unless the reviewer is satisfied that the key assumptions and key sources of uncertainty identified as having the