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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ld determine that the peer review and self-assessment have been performed in conformance with the relevant documents and with the exceptions and clarifications found in the appendices to RG 1.200. The reviewer should understand that the PRA standard allows each technical requirement provided in the standard to be assessed at various capability categories based on the risk- informed application. As stated in Section 1-1.3.3 of the ASME/ANS PRA Standard (Reference 4): The intent of the delineation of the Capability Categories within the SRs is generally that the degree of scope and level of detail, the degree of plant-specificity, and the degree of realism increases from Capability Category I to Capability Category III. However, the Capability Categories are not based on the level of conservatism (i.e., tendency to overestimate risk due to simplifications in the PRA) in a particular aspect of the analysis. The level of conservatism may decrease as the Capability Category increases and more detail and more realism are introduced into the analysis. However, this is not true for all requirements and should not be assumed…. When a specific application is undertaken, judgment is needed to determine which Capability Category is needed for each portion of the PRA, and hence which SRs apply to the applications. For further information, the reviewer is referred to Table 1-1.3-3 of the ASME/ANS PRA Standard. Implementation of RG 1.200 should obviate the need for a detailed staff review of the baseline PRA for a risk contributor (e.g., internal events, internal floods, internal fires, external hazards) for which a standard and a corresponding appendix to RG 1.200 exist. A staff review of those PRAs for the risk contributors significant to the decision and for which no standard has been endorsed in RG 1.200 will be necessary to the extent needed to support the decision. However, even for the risk contributors addressed by standards, the staff may, under certain circumstances,