Document: NUREG-0800
Document ID: 05908428-2f08-4a4f-8512-996c29c86da8
Document Type: srp
Title: have been revised to address Addendum B of the ASME standard and the revised NEI
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700657.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
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CFR Title: 

Content:
sts may make different assumptions regarding these issues, yet the issues still meet the requirements of the standard or have been accepted by the peer review. The choice of a specific assumption or a particular approximation may, however, influence the results of the PRA. The NRC staff needs to be confident that the conclusions drawn from the PRA are not invalidated by the use of specific assumptions. This is addressed primarily in the application- specific assessment through the use of sensitivity analyses. However, 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 that the assumptions have been characterized appropriately so that 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 the identification of the key assumptions, which are those made in response to key sources of uncertainty (see Regulatory Guide 1.200, Footnote 7 and Table A-1), and on assessing the appropriateness of the key assumptions. IV. EVALUATION FINDINGS The reviewer should provide documentation to conclude that the elements of the PRA required to produce the results have been performed in such a way that the PRA results are fully supportable. IV.1 Assessment of PRA Against Current Good PRA Practice The PRA elements are assessed to determine that they have been performed in a technically correct manner that conforms with current good PRA practices. This can be determined by an assessment that the PRA elements are performed consistently with the standard or peer review process as endorsed in the appendices to Regulatory Guide 1.200, or that, where a discrepancy exists, the approach used is equivalent to, or is superior to that referenced in the standard or peer