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:
with depth. Plate bearing test or Plate jacking test (rock) Bearing pad on rock surface is statically loaded by hydraulic jack. Deflection versus load is recorded. Estimation of elastic moduli of rock masses. May be used at ground surface, in excavations, in tunnels, or in boreholes. Results can be extrapolated to loaded areas larger than bearing pad only if rock properties are uniform over volume of interest, and if diameter of bearing pad is larger than average spacing of joints or other discontinuities. Pressure meter test (Dilatometer test) Uniform radial pressure is applied hydraulically over a length of borehole several times its diameter. Change in diameter versus pressure is recorded. Estimation of elastic moduli of rocks and estimation of shear strengths and compressibility of soils by empirical relationships. Test results represent properties only of materials in vicinity of borehole. Results may be misleading in testing materials whose properties may be anisotropic. DG-1392, Appendix C, Page C-5 APPENDIX C, Cont’d. METHOD PROCEDURE APPLICABILITY LIMITATIONS Field pumping test Water is pumped from or into an aquifer at constant rate through penetrating well. Change in piezometric level is measured at well and at one or more observation wells. Pumping pressures and flow rates are recorded. Packers may be used for pump-in pressure tests. Estimation of in situ permeability of soils and rock mass. Apparent permeability may be greatly influenced by local features. Effective permeability of rock is dependent primarily on frequency and distribution of joints. Test result in rock is representative only to the extent that the borehole intersects a sufficient number of joints to be representative of the joint system of the rock mass. Borehole field permeability test Water is added to an open-ended pipe casing sunk to desired depth. With constant head tests, constant rate of gravity flow into hole and casing pipe are measured. Variations include applied pressure