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:
sit that consists of significant amount of gravel and cobble. While sonic drill usually can produce continuous samples and with good recovery, the samples retrieved from the plastic sampling tubes are highly disturbed and broken up. Cable drilling Boring is advanced by repeated dropping of heavy big; removal of cuttings by bailing Advancing hole in soil or rock. Access for sampling, in situ testing, or logging in rock. Penetration of hard layers, gravel, or boulders in auger borings. Causes severe disturbance in soils; not suitable for use with undisturbed sampling methods. Continuous sampling or displacement boring Boring is advanced by repeated pushing of sampler, or closed sampler is pushed to desired depth and sample is taken. Recovery of representative samples of cohesive soils and undisturbed samples in some cohesive soils. Effects of advance and withdrawal of sampler result in disturbed sections at top and bottom of sample. In some soils, entire sample may be disturbed. Best suited for use in cohesive soils. Continuous sampling in cohesionless soils may be made by successive reaming and clearing of hole between sampling. DG-1392, Appendix C, Page C-2 APPENDIX C, Cont’d. METHOD PROCEDURE APPLICABILITY LIMITATIONS 2. Methods of Sampling Soil or Rock Hand cut or cylindrical sample Sample is cut by hand from soil exposed in excavation. Highest quality samples in all soils and in soft rock. Requires accessible excavation and dewatering if below water table. Extreme care is required in sampling cohesionless soils. Fixed-piston sampler Thin-walled tube is pushed into soil with fixed piston in contact with top of sample during push. Undisturbed samples in cohesive soils, silts, and sands above or below the water table. Some types do not have a positive means to prevent piston movement. Hydraulic piston sampler (Osterberg Sampler) Thin-walled tube is pushed into soil by hydraulic pressure. Fixed piston is in contact with top of sample during push. Undisturbed