Document: NUREG-0800
Document ID: 6b491ea9-a58b-4a6b-9697-23d3734295d2
Document Type: srp
Title: Techniques to Improve Subsurface Conditions.  In meeting the requirements
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730598.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.4.12
CFR Part: 
CFR Title: 

Content:
onducted in a similar manner and concurrent with that described in SRP Section 2.5.1. The services of consultants are used on selected sites to aid the staff in evaluating the geotechnical engineering aspects of particular sites. The results of site investigations (such as borings, geologic maps, logs of trenches and pits, permeability test records, results of seismic investigations, laboratory test results, profiles, and plot plans) are studied and cross-checked in considerable detail to determine whether or not the assumptions used in the evaluation are conservative. The design criteria are reviewed to ascertain that they are within the present state-of-the-art. For those facilities that have complex subsurface conditions, where marginal safety has been achieved, or where the applicant 2.5.4-17 Revision 3 - March 2007 proposes to construct a seismic Category I earth or rockfill dam, an independent analysis of the design is performed by the staff or its advisors. The data needed to satisfy the requirements of this section are not usually complete in the early stages. Detailed design investigations are usually still in progress and final conclusions have often not been made. Most of the open items of Section 2.5 remaining at the time that the safety evaluation report (SER) input is required are in the geotechnical engineering area because actual site conditions may not be fully revealed until excavations are opened and construction has begun. Thus, a site visit, in addition to that noted in Section 2.5.1, "Basic Geologic and Seismic Information," is necessary to examine the foundation materials exposed in excavations during construction. Information and final designs, including confirming tests and revised analyses, are to be submitted when all pertinent geotechnical engineering information is available. Review Procedures Specific to 10 CFR Part 52 Application Type 1. Early Site Permit Reviews Subpart A to 10 CFR Part 52 specifies the requirements and procedures