Document: NUREG-0800
Document ID: 1121c8ce-ab70-416c-9784-421014a1b25b
Document Type: srp
Title: SEISMIC DESIGN PARAMETERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1419/ML14198A460.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.1
CFR Part: 
CFR Title: 

Content:
rmined 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 response spectrum, then the design response spectra can be adjusted/modified in order to bound the minimum required spectrum. If the design response spectra are not modified, then the use of the two separate sets of spectra in the analysis and design of SSCs should be reviewed for adequacy. ii. Certified Standard Plant Design. For a DC application, the postulated seismic design response spectra should bound the minimum required response spectrum anchored to 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 Commission under 10 CFR Part 52. For a DC, a similar approach described above (under SRP 3.7.1 Subsection II.1.A.i) is used to ensure that the CSDRS envelop the minimum required spectrum at the foundation level. 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 that 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 should 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 in accordance with SRP Section 2.5.4. The free-field design response spectra (also referred to as