Document: NRC Regulatory Guide
Document ID: a094549d-8685-4dad-b90f-c28c7d279a53
Document Type: regulatory_guide
Title: Geologic and Geotechnical Site Characterization Investigations for Nuclear Power Plants + HISTORY – HISTORY 08/2021 – DG-1392 , Proposed Revision 3 07/2014 – Periodic Review of Revision 2 – Reviewed with no issues identified 02/2001 – DG-1101 , Proposed Revision 2 (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2119/ML21194A176.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.132
CFR Part: 
CFR Title: 

Content:
ility. Others to a depth of 7.5 m (25 ft) below reservoir bottom elevation.2 Sounding = An exploratory penetration below the ground surface used to measure or observe an in situ property of subsurface materials, usually without recovery of samples or cuttings. Principal boring = A borehole used as a primary source of subsurface information. It is used to explore and sample all soil or rock strata penetrated to define the site geology and the properties of subsurface materials. Not included are borings from which no samples are taken, borings used to investigate specific or limited intervals, or borings so close to others that information obtained represents essentially a single location. DG-1392, Appendix E, Page E-1 APPENDIX E APPLICATIONS OF SELECTED GEOPHYSICAL METHODS FOR DETERMINATION OF ENGINEERING PARAMETERS GEOPHYSICAL METHOD BASIC MEASUREMENT APPLICATION ADVANTAGES LIMITATIONS Surface Refraction (seismic) Travel time of compressional waves through subsurface layers Velocity determination of compression wave through subsurface. Depths to contrasting interfaces and geologic correlation of horizontal layers. Rapid, accurate, and relatively economical technique. Interpretation theory generally straightforward and equipment readily available. In saturated soils, the compression wave velocity reflects mostly wave velocities in the water and thus is not indicative of soil properties. Reflection (seismic) Travel time of compressional waves reflected from subsurface layers Mapping of selected reflector horizons. Depth determinations, fault detection, discontinuities, and other anomalous features. Rapid, thorough coverage of given site area. Data displays highly effective. In saturated soils, the compression wave velocity reflects mostly wave velocities in the water and thus is not indicative of soil properties. Rayleigh wave (surface wave) dispersion Travel time and period of surface Rayleigh waves Inference of shear wave velocity in near-surface materials. Rapid