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:
.............................................................................. E-1 APPENDIX F............................................................................................................................................ F-1 IN SITU TESTING METHODS............................................................................................................... F-1 APPENDIX G ........................................................................................................................................... G-1 INSTRUMENTS FOR MEASURING GROUND WATER PRESSURE ............................................... G-1 DG-1392, Page 6 B. DISCUSSION Reason for Revision This revision of the guide (Revision 3) captures updates to the U.S. Army Corps of Engineers’ Engineer Manuals that provide guidance for the procedures in this RG. The manual changes are primarily modest updating of geophysical methods used for site exploration and characterization. In addition, RG 1.165, “Identification and Characterization of Seismic Sources and Determination of Safe Shutdown Earthquake Ground Motion,” was withdrawn in 2010 and replaced by RG 1.208, “A Performance-Based Approach to Define the Sites-Specific Earthquake Ground Motion” (Ref. 11). Background Site investigations are needed to define site-specific geologic, geotechnical, geophysical, and hydrogeologic characteristics to the degree necessary for understanding surface and subsurface conditions and identifying potential geologic hazards that might affect the site. Investigations for geologic hazards such as fault deformation, landslides, cavernous rocks (surface or subsurface karst), ground subsidence, soil liquefaction, and any other natural or manmade external hazards are of particular importance. The density of data collected will depend on variability of the soil and rock materials and the safety-related importance of structures planned for a particular site location. Well-conducted site investigations can