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:
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 Part 5 of the ASME/ANS PRA standard to the extent applicable as endorsed by RG 1.200. Such an evaluation is acceptable with the following exceptions for implementing Part 5 for DCs: A. For review of DC applications, the seismic fragility calculations are based on design-specific information provided within the scope of a DC application. Site- and plant-specific information cannot be relied on for computing seismic fragility because this information is normally not available during the review of the DC application. Two methods, separation of variable and conservative deterministic failure margin (Ref. 11 and 13), are acceptable for determining seismic fragility. 19.0-17 Revision 3 – December 2015 B. The seismic fragility calculation should use the response spectrum shape defined as the DC’s CSDRS. 30. Generic data (such as test data, generic seismic qualification test data, and test experience data) can be used to support the seismic fragility analysis of components or equipment; however, justification should be provided to demonstrate that the generic data are consistent and applicable to components or equipment within the scope of the DC. 31. The procedure described in E.5 of the EPRI TR Report 1002988 (Ref. 8) is acceptable for developing fragilities for components or equipment on the SEL, which is to be qualified by seismic qualification tests. If an applicant uses EPRI Report 1002988 to develop fragilities, there should be less than a 1 percent probability of failure at ground motion equal to 1.67 times the CSDRS, including consideration of testing uncertainties. 32. The seismic demands to equipment defined in terms of the required response spectra should use CSDRS-based (or hard rock high frequency, if applicable) seismic input and account for the structural