Document: NUREG-0800
Document ID: 2d2b9404-d124-483c-971a-a8f564048299
Document Type: srp
Title: SEISMIC DESIGN PARAMETERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070640306.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.1
CFR Part: 
CFR Title: 

Content:
d at 0.1g (as specified in Appendix S to 10 CFR Part 50). These design response spectra are referred to as the CSDRS when the design is certified by the Comission under 10 CFR Part 52. For a certified standard plant design (e.g., COL application that references a CD or a COL application that references a CD and ESP), a similar approach described above (under subsection II.1.a.i) is used to ensure that the CSDRS envelop the minimum required response spectrum. Foundation level response spectra consistent with the CSDRS are determined for each seismic Category I structure. These foundation level spectra are compared to the minimum required spectrum to ensure they meet the 0.1g pga requirement in accordance with Appendix S to 10 CFR Part 50. If the foundation level spectra do not bound the minimum required spectrum, then the CSDRS can be adjusted/modified in order to bound the minimum required spectrum If the CSDRS are not modified, then the use of the two separate sets of spectra in the analysis and design of SSCs need to be reviewed for adequacy. For evaluation of soil liquefaction and soil/rock stability of slopes that may affect plant safety, the use of the site-specific GMRS rather than the CSDRS is reviewed on a case-by-case basis. 3.7.1-9 Revision 3 - March 2007 The free-field design response spectra (also referred to as the CSDRS for a CD)are usually developed for the 5-percent damping value. In the seismic analysis and design, the applicant needs to define the free-field design response spectra corresponding to all damping values to be used. For the case of RG 1.60 response spectra, Tables 1 and 2 of RG 1.60 provide amplification factors at four frequencies for calculating response spectra corresponding to different damping values. For the case of the free-field design response spectra that are different from RG 1.60 response spectra, Appendix C to this SRP section provides procedures to calculate response spectra for different damping values other than 5