Document: NUREG-0800
Document ID: 6f0274d3-4f13-4f83-ac9e-aa619c9b9a14
Document Type: srp
Title: Correlation of Earthquake Activity with Seismic Sources.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0529/ML052910327.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.3
CFR Part: 
CFR Title: 

Content:
To meet the requirements in Reference 1, 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 the CEUS sites,.when the SSE is determined using LLNL or EPRI PSHA methodology and data base, and Regulatory Guide 1.165 (Ref. 9) in meeting the requirements of Reference 1, 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 the Appendix E of Regulatory Guide 1.165. For sites where LLNL or EPRI methods and data bases are not used and it is necessary to identify and characterize seismic sources in meeting the requirements of Reference 1, 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. The applicant's presentation is accepted 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 (including geologic and geophysical data, seismicity, and the tectonic history) and the regional tectonic model. The discussion should include identification of the methods used to locate the earthquake hypocenters, an estimation