Document: NUREG-0800
Document ID: 67987dde-113b-4a5f-8a76-ff4c8503e940
Document Type: srp
Title: Geologic and Tectonic Characteristics of Site and Region.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0529/ML052910327.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.2
CFR Part: 
CFR Title: 

Content:
For the CEUS sites, when the SSE is determined using the results of the Lawrence Livermore National Laboratory (LLNL) or Electric Power Research Institute (EPRI) probabilistic seismic hazard analysis (PSHA) methodology and data base, and Regulatory Guide 1.165 (Ref. 9) in meeting the requirements of References I - 3, 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. For sites where LLNL or EPRI methods and data base have not been used, and it is necessary to identify and characterize seismic sources in meeting the requirements of References I through 3, 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. Information presented in Section 2.5.1 of the applicant's safety analysis report (SAR) or early site evaluation report (ESR) 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, must 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 (more specifically referred to as seismotectonic