Document: NUREG-0800
Document ID: b5cf0ef7-e63c-4da7-a02e-46e8ffeeb10e
Document Type: srp
Title: Correlation of Earthquake Activity with Seismic Sources.  To meet the
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1331/ML13316C066.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.3
CFR Part: 
CFR Title: 

Content:
requirements in 10 CFR 100.23, acceptance of this subsection is based on the development of the relationship between the history of earthquake activity and seismic sources of a region. For CEUS sites, when the GMRS are determined using CEUS SSC data bases and RG 1.208, this subsection is acceptable when adequate information is provided to demonstrate (1) that a thorough investigation has been conducted to assess the seismicity and 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 Regulatory Position 3 and Appendix C of RG 1.208. For sites where CEUS-SSC data bases are not 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. 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.” The applicant's presentation is acceptable when the earthquakes discussed in Subsection 2.5.2.1 of the SAR are shown to be associated with seismic sources. Whenever an earthquake hypocenter or concentration of earthquake hypocenters can be reasonably correlated with geologic structures, the rationale for the association should be developed considering the characteristics of the geologic structure