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:
need dewatering. Auger boring Boring is advanced by hand auger or power auger. Recovery of remolded samples and determining ground water levels. Access for undisturbed sampling of cohesive soils. Will not penetrate bounders or most rock. Hollow-stem auger boring Boring is advanced by means of continuous-flight helix auger with hollow-center stem. Access to undisturbed or representative sampling through hollow stem with thin-wall tube sampler, core barrel, or split-barrel sampler. Should not be used with coarse-grained soils. Not suitable for undisturbed sampling in loose sand or silt. Not recommended below the ground water table in cohesionless soils. Wash boring Boring is advanced by chopping with light bit and by jetting with upward deflected jet. Cleaning out and advancing hole in soil between sample intervals. Suitable for use with sampling operations in soil only if done with low water velocities and with upward deflected jet. Rotary drilling Boring is advanced by rotating drilling bit; cuttings removed by circulating drilling fluid. Boring in soil or rock. Drilling mud should be used in coarse-grained soils. Bottom discharge bits are not suitable for use with undisturbed sampling in soil unless combined with protruding core barrel, as in Denison sampler, or with upward deflected jets. Percussion drilling Boring is advanced by air-operated impact hammer. Detection of voids and zones of weakness in rock by changes in drill rate or resistance. Access for in situ testing or logging. Not suitable for use in soils. Sonic drilling Boring is advanced by vibrating entire drill string that strongly reduces friction on the drill string and drill bit due to liquefaction, inertia effects, and a temporary reduction of porosity of the soil. Drilling for coarse alluvial deposit 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