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Title: Application of intrinsic germanium spectral gamma-ray logging for characterization of high-level nuclear waste tank leaks

Abstract

Spectral gamma-ray logging with a high-resolution, intrinsic germanium logging system was completed in boreholes surrounding two high-level nuclear waste tanks at the US Department of Energy`s Hanford Site. The purpose was to characterize the concentrations of man-made radionuclides in the unsaturated zone sediments and identify any new leaks from the tanks. An intrinsic germanium detection system was used for this work because it was important to positively identify the specific radionuclides and to precisely assay those radionuclides. The spectral gamma log data were processed and displayed as log plots for each individual borehole and as three-dimensional plots of {sup 137}Cs radionuclide concentrations. These data were reviewed to identify the sources of the contamination. The investigation did not uncover a new or active leak from either of the tanks. Most of the contamination found could be related to known pipeline leaks, to surface contamination from aboveground liquid spills, or to leaks from other tanks. The current spectral gamma ray data now provide a new baseline from which to compare future log data and identify any changes in the radioelement concentration.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Westinghouse Hanford Co., Richland, WA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10113364
Report Number(s):
WHC-SA-2172
ON: DE94004480; BR: 35AF11201/35AF11202; TRN: 94:002027
DOE Contract Number:
AC06-87RL10930
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Nov 1993
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 54 ENVIRONMENTAL SCIENCES; HANFORD RESERVATION; GAMMA LOGGING; RADIOACTIVE WASTE FACILITIES; LEAK TESTING; CESIUM 137; RADIOECOLOGICAL CONCENTRATION; EXPERIMENTAL DATA; 052002; 053002; 540230; WASTE DISPOSAL AND STORAGE; RADIOACTIVE EFFLUENTS; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT

Citation Formats

Brodeur, J.R., Kiesler, J.P., Kos, S.E., Koizumi, C.J., Nicaise, W.F., and Price, R.K. Application of intrinsic germanium spectral gamma-ray logging for characterization of high-level nuclear waste tank leaks. United States: N. p., 1993. Web. doi:10.2172/10113364.
Brodeur, J.R., Kiesler, J.P., Kos, S.E., Koizumi, C.J., Nicaise, W.F., & Price, R.K. Application of intrinsic germanium spectral gamma-ray logging for characterization of high-level nuclear waste tank leaks. United States. doi:10.2172/10113364.
Brodeur, J.R., Kiesler, J.P., Kos, S.E., Koizumi, C.J., Nicaise, W.F., and Price, R.K. Mon . "Application of intrinsic germanium spectral gamma-ray logging for characterization of high-level nuclear waste tank leaks". United States. doi:10.2172/10113364. https://www.osti.gov/servlets/purl/10113364.
@article{osti_10113364,
title = {Application of intrinsic germanium spectral gamma-ray logging for characterization of high-level nuclear waste tank leaks},
author = {Brodeur, J.R. and Kiesler, J.P. and Kos, S.E. and Koizumi, C.J. and Nicaise, W.F. and Price, R.K.},
abstractNote = {Spectral gamma-ray logging with a high-resolution, intrinsic germanium logging system was completed in boreholes surrounding two high-level nuclear waste tanks at the US Department of Energy`s Hanford Site. The purpose was to characterize the concentrations of man-made radionuclides in the unsaturated zone sediments and identify any new leaks from the tanks. An intrinsic germanium detection system was used for this work because it was important to positively identify the specific radionuclides and to precisely assay those radionuclides. The spectral gamma log data were processed and displayed as log plots for each individual borehole and as three-dimensional plots of {sup 137}Cs radionuclide concentrations. These data were reviewed to identify the sources of the contamination. The investigation did not uncover a new or active leak from either of the tanks. Most of the contamination found could be related to known pipeline leaks, to surface contamination from aboveground liquid spills, or to leaks from other tanks. The current spectral gamma ray data now provide a new baseline from which to compare future log data and identify any changes in the radioelement concentration.},
doi = {10.2172/10113364},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1993},
month = {Mon Nov 01 00:00:00 EST 1993}
}

Technical Report:

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  • The Borehole Geophysics Section of the Geological Survey of Canada (GSC), in collaboration with the Low-Level Radioactive Waste Management Office (LLRWMO) of Atomic Energy of Canada Limited (AECL) recently investigated the application of borehole gamma-ray spectral logging to the characterization of sites contaminated with low-level radioactive waste (LLRW). Studies were conducted at two sites in Canada: the municipal landfill in the Town of Port Hope, Ontario which contains primarily radium contamination; and a temporary storage facility in Surrey, British Columbia which houses a sand/gravel/slag mixture with elevated thorium concentrations. In both cases, the gamma-ray spectral logs were successfully used tomore » identify, delineate and quantify the radioactivity; however, a problem related to the movement of radon gas (from the uranium/radium decay series) into boreholes was encountered at the Port Hope site. In this paper, examples from both sites which demonstrate the advantages of gamma-ray spectral logging for characterizing LLRW are presented. The {open_quotes}radon problem{close_quotes} encountered at Port Hope is discussed, including its effect on the logging results and a procedure that was developed to reduce this effect.« less
  • The US Department of Energy`s (DOE`s) Grand Junction Projects Office (GJPO) is engaged in establishing an initial, or baseline, characterization of the gamma-ray-emitting contaminants in the subsurface of the Tank Farms at the DOE Hanford site in the State of Washington. These baseline data are gathered by logging existing monitoring boreholes with two high-resolution passive gamma-ray logging systems informally known as Gamma 1 and Gamma 2. Calibration of the logging systems is crucial to the assurance of data quality. The project document Spectral Gamma-Ray borehole Geophysical Logging Characterization and Baseline Monitoring Plan for the Hanford Single-Shell Tanks (DOE 1995a) specifiesmore » that the initial, or base, calibration of both systems must be performed before commencement of field measurements at Hanford and that both systems must be recalibrated every 6 months thereafter using the calibration standards at the Hanford borehole logging calibration center. Data collection for the base calibrations was completed in April 1995; the results were published in Calibration of Two Spectral Gamma-Ray Logging Systems for Baseline Characterization Measurements in the Hanford Tank Farms (DOE 1995b). This report documents the first recalibration of the two systems that was performed in October 1995 at the Hanford Site. Analyses of data collected during the recalibrations are presented.« less
  • The U.S. Department of Energy`s (DOE) Grand Junction Projects Office (GJPO) is establishing an initial, or baseline, characterization of gamma-ray-emitting contaminants in the subsurface of the Tank Farms at the DOE Hanford Site in the State of Washington. These baseline data are gathered by logging existing monitoring boreholes with two high-resolution passive spectral gamma-ray logging systems (SGLSs) informally known as Gamma 1 and Gamma 2. Calibration of the logging systems is crucial to the assurance of data quality. The project document Vadose Zone Monitoring Project at the Hanford Tank Farms, Spectral Gamma-Ray Borehole Geophysical Logging Characterization and Baseline Monitoring Planmore » for the Hanford Single-Shell Tanks specifies that both systems must be recalibrated, using the calibration standards at the Hanford borehole logging calibration center, every 6 months. DOE presents a description of the first recalibrations.« less
  • Small, shielded cadmium telluride (CdTe) semiconductor gamma-ray detectors have been used for in situ radiological characterization of underground high-level radioactive waste tanks. Remote measurements have been made in gamma radiation fields up to 700 R/h. Spectral data have been used to generate qualitative and quantitative radionuclide profiles of high-level radioactive waste tanks. Two electronic spectral enhancement techniques (pulse risetime discrimination and pulse risetime compensation) have been used in order to measure trace isotopes with photopeak energies greater than 662keV in the presence of large amounts of {sup 137}Cs. Spectral resolution of 1.5% for the {sup 137}Cs 662 keV photopeak hasmore » been obtained.« less
  • Six characterization boreholes were drilled, sampled, logged, and abandoned in the 100-FR-1 Operable Unit. The geophysical logging was carried out with the Radionuclide Logging System (RLS) to determine the levels of radioactive contaminants in the subsurface. Five of the six boreholes penetrated contamination that was successfully assayed with the RLS data.