Document: NUREG-0800
Document ID: 74980693-f1d2-4f59-a418-b297e1cc6509
Document Type: srp
Title: SURFACE FAULTING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730597.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.3
CFR Part: 
CFR Title: 

Content:
), followed by an OL (Step 2) after construction excavations and required geologic mapping of all Seismic Category I excavations have been completed and plant design bases have been approved by staff. Seismic Category I excavations and the associated geologic maps are to be examined by staff prior to placement of backfill or concrete and before the SER is completed. This procedure should continue for future sites licensed under the two-step process of 10 CFR Part 50. If faults are identified in the site vicinity, site area, or at the site location, including construction excavations, it must be demonstrated that they do not have a potential for causing surface or near-surface ground displacement and acting as a capable tectonic source at the site location. This demonstration is accomplished by determining ages of latest fault displacements. Stratigraphic methods may be employed to determine age of faulting by identifying datable soil horizons or a stratigrahic unit overlying the fault that is not offset to bound the age of faulting. Other methods include correlating the latest faulting event with regional tectonic activity of known age, providing geomorphologic indications of age, and determining the relationship between time of fault displacement and ages of marine or fluvial terraces. Viable age dating methods that can be used to assess chronology of faulting are referred to in Appendix C of Regulatory Guide 1.208 and described in Appendix D of Regulatory Guide 1.165 and NUREG/CR-5562 (Reference 17). During the Phase 2 detailed technical review, staff develops questions and comments related to issues considered to be inadequately addressed by the applicant which may 2.5.3-13 Revision 4 - March 2007 either be revealed during this review phase or developed based on additional information provided by the applicant as a result of the acceptance review. Questions may also result from discovery of references not cited by the applicant that contain conclusions