Document: NUREG-0800
Document ID: dd4f84a9-8976-44c4-b631-d7c0254f4efc
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1416/ML14161A594.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
with the exceptions that the analysis should not be based on site-specific and plant-specific information and should not 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 “super element,” 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 that a seismic equipment list (SEL) 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 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: 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. B. The seismic fragility calculation should use the response spectrum shape defined as the DC’s CSDRS. 19.0-19 Draft Revision 3 –November 2014 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