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Title: Integration and Evaluation of a Position Sensor with Continuous Read-Out for use with the Environmental Measurement-While-Drilling Gamma Ray Spectrometer System

The Environmental Measurement-While-Drilling-Gamma Ray Spectrometer (EMWD-GRS) system represents an innovative blend of new and existing technology that provides real-time environmental and drill bit data during drilling operations. The EMWD-GRS technology was demonstrated at Savannah River Site (SRS) F-Area Retention Basin. The EMWD-GRS technology demonstration consisted of continuously monitoring for gamma-radiation-producing contamination while drilling two horizontal boreholes below the backfilled waste retention basin. These boreholes passed near previously sampled locations where concentrations of contaminant levels of cesium had been measured. Contaminant levels continuously recorded by the EMWD-GRS system during drilling were compared to contaminant levels previously determined through quantitative laboratory analysis of soil samples. The demonstration of the EMWD-GRS was a complete success. The results show general agreement between the soil sampling and EMWD-GRS techniques for CS-137. It was recognized that the EMWD-GRS tool would better satisfy our customers' needs if the instrument location could be continuously monitored. During the demonstration at SRS, an electromagnetic beacon with a walkover monitor (Subsite{reg_sign}) was used to measure bit location at depth. To use a beacon locator drilling must be stopped, thus it is normally only used when a new section of pipe was added. The location of contamination could only be estimated basedmore » on the position of the EMED-GRS package and the distance between locator beacon readings. A continuous location system that would allow us to know the location of each spectrum as it is obtained is needed.« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
3881
Report Number(s):
SAND99-0462C
TRN: US0101447
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: North American No Dig 98 Preliminary Program, ''Achieving New Heights in Trenchless Technology'', Albuquerque, NM (US), 04/05/1998--04/08/1998; Other Information: PBD: 22 Feb 1999
Research Org:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 47 OTHER INSTRUMENTATION; CONTAMINATION; WELL DRILLING; RADIATION MONITORING; SAVANNAH RIVER PLANT; GAMMA SPECTROMETERS; MWD SYSTEMS; DESIGN; FIELD TESTS; SETTLING PONDS; GAMMA DETECTION