Document: NUREG-0800
Document ID: b8d2b8f5-432a-4c0a-81ab-20231f7d0f28
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1508/ML15089A068.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
ifically addresses the Commission’s performance goals related to the prevention and mitigation of severe accidents. Acceptance Criteria for a PRA-based SMA This section provides guidance for the NRC reviewer of an applicant’s PRA-based SMA. However, if an applicant performs a seismic PRA (SPRA), then the staff should confirm that a peer review to Part 5 of the ASME/ANS PRA Standard has been performed and that the SPRA meets Capability Category 1 of that Standard. 25. The staff will determine whether the applicant has performed a PRA-based SMA to determine the seismic capacity of the plant and for each sequence that may lead to core damage or large release. 26. The design-specific plant system and accident sequence analysis for a PRA-based SMA is performed in accordance with, at a minimum, the Capability Category I requirements of Section 5-2.3 of Part 5 of the ASME/ANS PRA Standard (Ref. 6), with the exceptions that the analysis does not need to be based on site-specific and plant-specific information and does not have to rely on an as-built and as-operated plant. 27. Screening of rugged SSCs may be performed in a PRA-based SMA based on the DC’s Certified Seismic Design Response Spectra (CSDRS) with its peak ground acceleration (PGA) scaled by a factor of 1.67. The basis for the screening should be adequately documented and ensure that the so-called “supercomponents,” as described in Note 3 of Section 5-2.3 of Part 5 of the ASME/ANS PRA standard, will not control the plant seismic margin capacity. 28. The staff will determine whether a safe-shutdown equipment list (SSEL) (for the seismic hazard approach) or a seismic equipment list (SEL) (for the seismic PRA approach) has been prepared which documents the SSCs associated with the accident sequences that will require seismic fragility evaluation for determining sequence-level HCLPF. 29. The seismic fragility evaluation of SSCs may be performed based on Capability Category I requirements of Section 5-2.2 of