Document: NUREG-0800
Document ID: 8dd882f4-a34f-4415-acd1-ebb441c72786
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1213/ML12132A481.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
est 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. 30. The procedure described in E.5 of the EPRI Report 1002988 (Reference 21) 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. 31. 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 amplifications caused by the supporting structures, including soil-structure interaction effects and supporting systems, and incorporate an additional seismic margin factor, as appropriate. 32. The HCLPF value for an SSC should be determined corresponding to a 1 percent failure probability on the mean fragility curve. 33. The HCLPF value should be expressed in terms of PGA in the PRA-based SMA process. 34. The plant-level HCLPF capacity should be determined based on the sequence-level HCLPF values for all sequences as identified in the design-specific plant system and accident sequence analysis. 19.0-18 Draft Revision 3 – September 2012 35. The Min-Max method2 is acceptable for computing sequence-level HCLPF values. 36. The staff will determine that the design-specific plant-level HCLPF value has been demonstrated to be equal to or greater than 1.67 times the CSDRS PGA. III. REVIEW PROCEDURES General Principles The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on