Document: NUREG-0800
Document ID: 48a7b79e-0dde-49df-9914-7c7b714c22f8
Document Type: srp
Title: Geologic and Tectonic Characteristics of Site and Region.  For sites in the
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1331/ML13316C066.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.2
CFR Part: 
CFR Title: 

Content:
ources (in the PSHA) are consistent with the results of site and regional investigations or the sources have been updated in accordance with Regulatory Position 3 and Appendix C of RG 1.208. For sites where the CEUS-SSC data bases do not provide coverage, such as in the Western United States (WUS), 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 potentially significant in determining the earthquake potential of the region have been identified, or that an adequate investigation has been carried out to establish that there are no unidentified significant seismic sources. Identification and characterization of seismic sources should be conducted consistent with the methods described in NUREG/CR-6372, “Recommendations for Probabilistic Seismic Hazard Analysis: Guidance on Uncertainty and Use of Experts” and NUREG-2117, “Practical Implementation Guidelines for SSHAC Level 3 and 4 Hazard Studies.” 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 proposed seismogenic sources may be based on seismicity studies, active tectonics indicators, paleoseismic evidence, differences in geologic history, differences in the current tectonic regime, or other seismic, geologic, and tectonic considerations. The staff considers that the most important factors for