Document: NUREG-0800
Document ID: 5b63f9a1-de54-49c7-811c-726429f04b82
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1818/ML18183A044.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.3
CFR Part: 
CFR Title: 

Content:
Draft Revision 6 – September 2016 boreholes; geologic and geotechnical logging of soil materials and rock core in boreholes, and geologic mapping of trenches and test pits to define paleoseismic features and fault surfaces (including growth faults) or collapse features. The nature and extent of investigations to determine whether or not shallow subsurface deformation features (e.g., blind faults, folds related to blind faults, growth faults, dissolution caverns, salt diapirism) are likely to exist will vary in degree of detail and extent required based on geologic context of the specific site. In the central and eastern United States (CEUS) region, defined in NUREG-2115, earthquake-generating faults typically do not extend to the ground surface or there is insufficient overlying Quaternary soil or rock to constrain the timing of deformation. In the western United States, many Quaternary faults are exposed at the ground surface and might be more readily characterized with respect to surface deformation potential if appropriately aged geologic formations or units exist at the site of deformation. Tectonic deformation features (including faults related to subduction zones) can exist as blind faults that might be expressed on the surface or near-surface by actively growing folds or areas of uplift and subsidence. (3) Timing of Deformation. The reviewer evaluates the applicant’s assessment for the ages of past deformation events to determine if a sufficient technical basis has been established for the age estimates. The reviewer determines whether geochronological methods used by the applicant are based on generally acceptable procedures, such as those described in NUREG/CR-5562 or McCalpin (2009). For cases in which the applicant employs unusual or untested age determination techniques, staff will require documentation of the techniques including verification of the precision and accuracy of associated ages. Accuracy and precision of all age-dating techniques used