Document: NUREG-0800
Document ID: 475588e2-99db-4d3e-bdc3-a2137567b58a
Document Type: srp
Title: Geologic and Tectonic Characteristics of Site and Region. In
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340591.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.2
CFR Part: 
CFR Title: 

Content:
meeting the requirements of References 1, 2, and 3, this subsection is ac- cepted when all geologic structures within the region and tectonic activity that are significant in determining the earthquake potential of the region are identified, or when an adequate investigation has been carried out to provide reasonable assurance that all significant tectonic structures have been identified. Information presented in Section 2.5.1 of the applicant's safety analysis report (SAR) and information from other sources (e.g., Refs. 9 and 14 through 18) dealing with the current tectonic regime should be developed into a coherent, well-documented discussion to be used as the basis for determining tectonic provinces and the earthquake-generating poten- tial of the identified geologic structures. Specifically, each tectonic province, any part of which is within 200 miles of the site, must be identified. The staff interprets tectonic provinces to be regions of uniform earthquake potential (seismotectonic provinces). The proposed tectonic provinces may 2.5.2-3 Rev. 2 - August 1989 be based on seismicity studies, differences in geologic history, differences in the current tectonic regime, etc. The staff considers that the most important factors for the determination of tectonic provinces include both (1) development and characteristics of the current tectonic regime of the region that is most likely reflected in the neotectonics (Post-Miocene or about 5 million years and younger geologic history) and (2) the pattern and level of historical seismicity. Those characteristics of geologic structure, tectonic history, present and past stress regimes, and seismicity that dis- tinguish the various tectonic provinces and the particular areas within those provinces where historical earthquakes have occurred should be described. Alternative regional tectonic models derived from available literature sources, including previous SARs and NRC staff Safety Evaluation Reports (SERs), should be