Document: NUREG-0800
Document ID: 00d3733d-7b45-4276-8765-54fc5ae522d6
Document Type: srp
Title: .3-3
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0423/ML042390212.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5
CFR Part: 
CFR Title: 

Content:
ate geosciences information regarding Quaternary tectonics at the site. According to 10 CFR 100.23, applicants are required to investigate the potential for near-surface deformation, both tectonically induced and that induced by other phenomena (Ref. 2). The steps that applicants may follow in determining the presence and extent of deformation and whether near-surface deformation (if present) represents a hazard are in Regulatory Guide 1.165 in Appendix D (Ref. 3). The area extending outward 8 km (5 mi) from the site, and the site [1 km (0.6 mi)] must be investigated by a combination of exploratory methods that should include borings, trenching, seismic profiling and other geophysical methods, geological mapping, and seismic instrumentation. The results of these explorations are cross-compared with other available data and evaluated by the staff. An important part of the staff's review effort is to compare the new information derived from these investigations or other sources with the specific data base used in the probabilistic seismic hazard analysis (PSHA) for the site (Ref. 3). It has been the policy of the staff to encourage applicants to avoid areas that have a possibility for near-surface tectonic deformation. As the question of whether or not a surface tectonic deformation condition exists is critical in determining site suitability, this consideration is usually addressed very early in the review. The exceptions are cases in which a previously unknown fault is revealed in excavations during construction or is discovered during the course of other investigations in the area. The staff should require early in the review that it be notified by the applicant when the excavations for Seismic Category I structures are available for NRC inspection and when the detailed geological maps to be used by the staff while examining the excavations will be available. In addition, the staff should require that it be contacted immediately if a fault, not previously