Document: NUREG-0800
Document ID: 2a41e1c8-717c-46a4-9f85-40a92a9a946e
Document Type: srp
Title: - Geophysical Surveys.  In meeting the requirements of 10 CFR 100.23, the
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1331/ML13311B744.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.4.4
CFR Part: 
CFR Title: 

Content:
presentation of the dynamic characteristics of soil or rock is acceptable if geophysical investigations have been performed at the site and the results obtained there from are presented in detail. Completeness of the presentation is judged by whether or not the accuracy and resolution of the exploratory techniques used by the applicant is adequately justified, whether the techniques represent state-of-the-art exploration methods, and whether the applicant's interpretations are supported by adequate field records in the applicant’s technical submittal. Multiple measurements of dynamic properties should be incorporated to capture uncertainty in the primary parameters controlling site response behavior. See also Subsection 2.5.2.3. Staff evaluation consists of a detailed review of all geophysical explorations conducted at the site, including seismic refraction, reflection, and in-hole surveys and magnetic and gravity surveys. Logs of core borings, trenches, and test pits are reviewed and compared with data from the seismic surveys and other geophysical techniques. Results must be consistent or additional investigations are required. Variability and/or inconsistency in the results must be addressed, and an acceptable basis must be provided to support the selection of characteristic values, and conservative values should be used. The staff will visit the site to examine the walls and floors of excavations at an appropriate time after licensing to confirm conditions as mapped in the open excavations with interpretations and assumptions derived during the investigation program.