Document: NUREG-0800
Document ID: 006d1df0-36dd-4f98-9175-0687be132d43
Document Type: srp
Title: Geologic and Tectonic Characteristics of Site and Region.   Seismic sources
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730593.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.2
CFR Part: 
CFR Title: 

Content:
identified and characterized by the Lawrence Livermore National Laboratory (LLNL) and the Electric Power Research Institute (EPRI) were used for studies in the CEUS in the past. For CEUS sites, the LLNL and EPRI seismic source data bases may need to be updated. Therefore to meet the requirements of 10 CFR 100.23, this subsection is acceptable when adequate information is provided to demonstrate: (1) that a thorough investigation has been conducted to identify seismic sources that could be significant in estimating the seismic hazards of the region if they exist; and (2) that existing sources (in the PSHA) are consistent with the results of site and regional investigations or the sources have been updated in accordance with Appendix E of Regulatory Guide 1.165 or Appendix C of Regulatory Guide 1.208. For sites where the LLNL or EPRI data bases have not been used, and it is necessary to identify and characterize seismic sources in meeting the requirements of 10 CFR 100.23, adequate information must be provided in this subsection to demonstrate that all seismic sources that are significant in determining the earthquake potential of the region have been identified, or that an adequate investigation has been carried out to provide reasonable assurance that there are no unidentified significant seismic sources. 2.5.2-6 Revision 4 - March 2007 Information presented in Section 2.5.1 of the applicant's safety analysis report (SAR) and information from other sources dealing with the current tectonic regime should be developed into a coherent, well-documented discussion to be used as the basis for characterizing the earthquake-generating potential of seismic sources. Specifically, each seismic source, any part of which is within 320 km (200 miles) of the site, should be identified. In the CEUS, the seismic sources will most likely be seismogenic sources with large regions of diffuse seismicity, each characterized by its own recurrence model. The staff interprets seismogenic