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:
the excavations; (2) at a minimum, undertaking detailed geologic mapping of walls and floors of all excavations for Seismic Category I facilities; and (3) notifying NRC staff when the excavations and geologic maps of those excavations are available for examination and evaluation. The two-step licensing process defined in 10 CFR Part 50 requires applicants to obtain a CP (Step 1), 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 the staff. Seismic Category I excavations and the associated geologic maps are to be examined by the 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. During the Phase 2 detailed technical review, the staff develops questions and comments related to issues considered to be inadequately addressed by the applicant which may 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 conflicting with those of the applicant. These first-round questions usually require the applicant to conduct additional investigations or supply clarifying information and are referred to as Requests for Additional Information (RAIs). When insufficient data are provided by the applicant to support interpretations and conclusions presented, and more conservative reasonable alternative interpretations are technically supported in the literature, the staff will request additional investigations or require the applicant to adopt the more conservative interpretations. This review phase will commonly involve public meetings with the applicant to clarify questions and allow the applicant to present