Document: NUREG-0800
Document ID: cdf49860-f8c3-4466-8c74-8bddccf25c5f
Document Type: srp
Title: Geologic and Tectonic Characteristics of Site and Region. In
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0423/ML042390209.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.2
CFR Part: 
CFR Title: 

Content:
5 meeting the requirements of References 1, 2, and 3, this subsection is 6 accepted when all geologic structures within the region and tectonic activity 7 EJ- sEi0 that are significant in determining the earthquake potential 8 of the region are identified, or when an adequate investigation has been 9 carried out to provide reasonable assurance that all significant teetenie 10 struetureLs have been identified. Information presented in 11 Section 2.5.1 of the applicant's safety analysis report (SAR) and information 12 from other sources (e.g., Refs. 9 and 14 through 1~) dealing with the current 13 tectonic regime should be developed into a coherent, well-documented 14 discussion to be used as the basis E characterizing the earthquake- 15 generating potential of the identified geelogic structures 16 Specifically, each tectenic provinc , any part of which is 17 within 200 miles) of the site, must be identified. The staff 18 interprets F4Mtectonic provinces to be regions of uniform earthquakke U 19 potential ( scizmotcetonic proeinees) 'U" 20 M 1i . The proposed 21 ii tectonic provinces may be based on seismicity studies, differences in 22 geologic history, differences in the current tectonic regime, 23 24 The staff considers that the most important factors for the determination of 25 tcctonic provinces include both (1) development and 26 characteristics of the current tectonic regime of the region that is most 27 likely reflected in the ncotcetonics (Post Hiocenc or about 5 28 t i ~ W Ws TM million years and younger geologic 29 history) and (2) the pattern and level of historical seismicity. Those 30 characteristics of geologic structure, tectonic history, present and past 31 stress regimes, and seismicity that distinguish the various M 32 tectonic provinces and the particular areas within those pev^iitees 33 where historical earthquakes have occurred should be described. Alternative 34 regional tectonic models derived from available literature pourers, including U 35