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:
ne Deformation Characteristics (adapted from EM 1110-1-1804, U.S. Army Corps of Engineers, 2001) TEST FOR REMARKS SOILS ROCKS Geophysical refraction, crosshole and downhole X X For determining dynamic Young’s Modulus, E, at the small strain induced by test procedure. Test values for E must be reduced to values corresponding to strain levels induced by structure or seismic loads. Pressuremeter X X Consider test as possibly useful but not fully evaluated. For soils and soft rocks, shales, etc. Chamber test X X Uniaxial (tunnel) jacking X X Flatjacking X Borehole jack or dilatometer X Plate bearing X Plate bearing X Standard penetration X Used in empirical correlations to estimate settlement of footings; a number of relationships are published in the literature to relate penetration test blow counts to settlement potential. DG-1392, Appendix G, Page G-1 APPENDIX G INSTRUMENTS FOR MEASURING GROUND WATER PRESSURE INSTRUMENT TYPE ADVANTAGES LIMITATIONSa Observation well Can be installed by drillers without participation of geotechnical personnel. Provides undesirable vertical connection between strata and is therefore often misleading; should rarely be used. Should not be confused with monitoring well. Open standpipe piezometer Reliable. Long, successful performance record. Self-de-airing if inside diameter of standpipe is adequate. Integrity of seal can be checked after installation. Can be converted to diaphragm piezometer. Can be used for sampling ground water. Can be used to measure permeability. Slow response to changes in piezometric head. Subject to damage by construction equipment and by vertical compression of soil around standpipe. Extension of standpipe through embankment fill interrupts construction and causes inferior compaction. Porous filter can plug from repeated water inflow and outflow. Push-in versions subject to several potential errors. Twin-tube hydraulic piezometer Inaccessible components have no moving parts. Reliable. Long, successful