Document: NRC Regulatory Guide
Document ID: cfc61809-5745-460f-8a26-13c168659924
Document Type: regulatory_guide
Title: Identification and Characterization of Seismic Sources and Determination of Safe Shutdown Earthquake Ground Motion
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740084.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.165
CFR Part: 
CFR Title: 

Content:
design with an established SSE (for instance, an Advanced light Water Reactor with 0.3g PGA SSE). In this example, the certified design SSE spectrum compares favorably with the site-specific re sponse spectra determined in Step 2 or 3 of Regulatory Position 4. Figure F.2 depicts a situation in which a standard broad-band shape is selected and its amplitude is scaled so that the design SSE envelopes the site-specific spec tra. Figure F.3 depicts a situation in which a specific smooth shape for the design SSE spectrum is developed to envelope the site-specific spectra. In this case, it is particularly important to be sure that the SSE contains adequate energy in the frequency range of engineering interest and is sufficiently broad-band. 1.165=42 r 0 LU S8.1. 1.75 7.5 Frequency, Hz Figure F.1 Use of SSE Spectrum of a Certified Design 0 SIP-10 0 .. ... " Modified or 0 5, Unmodified " '8•- S \, Standard SI CO hape 1.75 7.5 Frequency, Hz Figure F.2 Use of a Standard Shape for SSE Smooth Broad-Band Spectrum 1.75 7.5 Frequency, Hz Figure F.3 Development of a Site-Specific SSE Spectrum (Note: the above figures illustrate situations for a rock site. For other site conditions, the SSE spectra are compared at free-field after performing site amplification studies as discussed in Step 4 of Regulatory Position 4.) 1.165-43 0 CO I I i ti REFERENCES F.1 Electric Power Research Institute, "Guidelines for Determining Design Basis Ground Motions," EPRI Report TR-102293, Volumes 1-4, May 1993.1 tCopies may beobtained from the EPRI Distribution Center, 207 Coggins Drive, Pleasant Hill, CA 94523; phone (510)934-4212. F.2 USNRC, "Design Response Spectra for Seismic Design of Nuclear Power Plants," Regulatory Guide 1.60.21 2Single copies of regulatory guides, both active and draft, may be ob tained free of charge by writing the Office of Administration, Attn: Dis tribution and Mail Services Section, USNRC, Washington, DC 20555; or by fax at (301)415-2260. Copies are available for