Document: NUREG-0800
Document ID: 94da2f11-6df6-47d0-a25e-edeb21a4d649
Document Type: srp
Title: 3.7.1-12
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1419/ML14198A460.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.0
CFR Part: 
CFR Title: 

Content:
he staff's SER. The reviewer also states the bases for those conclusions. The staff concludes that the seismic design parameters used in the design of plant SSCs are acceptable and meet the applicable requirements of 10 CFR Part 50, Appendix A, GDC 2, and 10 CFR Part 50, Appendix S. This conclusion is based on the following: The applicant has met the relevant requirements of GDC 2 and 10 CFR Part 50, Appendix S by appropriate consideration for the most severe earthquake recorded for the site with an appropriate margin and considerations for two levels of earthquakes - the SSE and OBE. The applicant has met these requirements by the use of the methods and procedures as follows: The seismic design response spectra (OBE and SSE) applied in the design of seismic Category I SSCs meet or exceed the free-field response spectra provided in SRP Section 2.5.2. For the plant subject to Appendix S of 10 CFR Part 50, the horizontal component of the SSE ground motion in the free-field at the foundation level of the structures is based on an appropriate response spectrum with a PGA of at least 0.1g. The appropriate response spectrum associated with this minimum PGA should be a smooth broadband response spectrum (e.g., RG 1.60, or other appropriate shaped spectra, if justified). The percentage of critical damping values used in the seismic analysis of seismic Category I SSCs is in conformance with RG 1.61. The design time history used for seismic design of seismic Category I plant SSCs is adjusted in amplitude and frequency content to obtain response spectra that envelop the design response spectra specified for the site and also exhibits sufficient energy in the frequency range of interest. Conformance with the recommendations of SRP Section 2.5.2 and RG 1.61 ensures that the seismic inputs to the analysis of seismic 3.7.1-22 Revision 4 – December 2014 Category I SSCs are adequately defined so as to form a conservative basis for the design of such SSCs to withstand seismic