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:
cluded in maps, cross sections, and the database. All pertinent newly discovered geologic features should be evaluated for their potential impact on foundation materials. This evaluation might require relative or absolute age dates on certain features and particular tectonic structures such as faults and shear zones. The maps, cross sections, and database should include any features installed to improve, modify, or control geologic conditions (e.g., reinforcing systems, permanent dewatering systems, and special treatment areas). Photographic records of foundation geologic mapping and treatments should be made and retained in the database. The GIS and other databases should be continuously updated, up to and including the construction phase, resulting in inclusion of final as-built information in the database. Appendix A to NUREG/CR-5738 provides detailed guidance on appropriate technical procedures for geologic mapping of foundation materials. Geologic mapping of tunnels and other underground openings must be planned differently from foundation mapping. Technical procedures for mapping tunnels are outlined in Appendix B to NUREG/CR-5738 and can be modified for large chambers. The individual in charge of foundation geologic mapping should be familiar with plant design and subsurface features and characteristics based on previous site investigations. This person should consult with plant design personnel during excavation whenever differences between the actual geology and the design-basis geologic model are discovered. The same individual should be involved in all decisions about changes in plant foundation design and any additional foundation treatments that might be necessary based on actual observed conditions of the foundation materials. DG-1392, Page 23 7. Support Functions 7.1 Surveying, Mapping, and Development of the GIS Database Surveying is an important function that should accompany all essential site investigation activities from reconnaissance through