Document: NUREG-0800
Document ID: c5da9adb-ab27-4695-99d7-12432175e5c4
Document Type: srp
Title: and Reference 3).
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730464.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2
CFR Part: 
CFR Title: 

Content:
d the required resolution. The application is also reviewed for any significant new information derived from site vicinity, site area, or site location geologic, seismic, geophysical, and geotechnical investigations that had not been previously applied to tectonic and ground motion models used in the PSHA. Determinations reqarding geologic and seismic suitability of the site are made by the staff after CP, OL, or COL application reviews. Conclusions regarding an OL application will include evaluation of excavations for Seismic Category I structures. For COL applications that do not reference a previous ESP, the staff evaluation findings will include the evaluation findings identified above for ESP reviews. Otherwise, conclusions relating to geologic and seismic suitability of a site following a COL application review will be made when the applicant has committed to (1) notifying the staff immediately if previously unknown geologic features that could represent a hazard to the plant are discovered in the construction excavations; (2) at a minimum, undertaking detailed geologic mapping of walls and floors of all excavations for Seismic Category I facilities; and (3) notifying the staff when the excavations and associated geologic maps are available for examination and evaluation. The staff will visit the COL application site to examine walls and floors of excavations at an appropriate time after licensing to confirm that no evidence exists in the excavations for previously unknown geologic features (e.g., faults, paleoliquefaction features indicative of seismically-induced ground motions, solution cavities) or potentially problematical geologic materials (e.g., soil or rock zones that may result in unanticipated engineering concerns due to liquefaction, heave, excessive settlement, or groundwater flow during or after construction). This staff site visit, in addition to determining whether there is new information of significance for site suitability and safety that