Test results and supporting analysis of a near surface heater experiment in the Eleana Argillite

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A preliminary evaluation of the in-situ thermomechanical response of argillite to heating was obtained from a near-surface heater test in the Eleana Formation, at the Nevada Test Site. The experiment consisted of a 3.8 kW, 3-m long x 0.3-m diameter electrical heater in a central hole surrounded by peripheral holes containing instrumentation to measure temperature, gas pressures, and vertical displacement. A thermal model of the experiment agreed well with experimental results; a comparison of measured and predicted temperatures indicates that some nonmodeled vertical transport of water and water vapor occurred near the heater, especially at early times. A mechanical model ... continued below

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21 p.

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McVey, D.F.; Lappin, A.R. & Thomas, R.K. December 31, 1979.

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Description

A preliminary evaluation of the in-situ thermomechanical response of argillite to heating was obtained from a near-surface heater test in the Eleana Formation, at the Nevada Test Site. The experiment consisted of a 3.8 kW, 3-m long x 0.3-m diameter electrical heater in a central hole surrounded by peripheral holes containing instrumentation to measure temperature, gas pressures, and vertical displacement. A thermal model of the experiment agreed well with experimental results; a comparison of measured and predicted temperatures indicates that some nonmodeled vertical transport of water and water vapor occurred near the heater, especially at early times. A mechanical model indicated that contraction of expandable clays in the argillite produced a region 1.5 to 2.0 m in radius, in which opening of preexisting joints occurred as a result of volumetric contraction. Results of thermal and mechanical modeling, laboratory property measurements, experimental temperature measurements, and post-test observations are all self-consistent and provide preliminary information on the in situ response of argillaceous rocks to the emplacement of heat-producing nuclear waste. 9 figures, 2 tables.

Physical Description

21 p.

Notes

NTIS, PC A02/MF A01

Source

  • Workshop on the use of argillaceous materials for the isolation of radioactive wastes, Paris (France), 10-12 Sep 1979

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  • Report No.: SAND--79-1746C
  • Report No.: CONF-790938--4
  • Grant Number: EY-76-C-04-0789
  • Office of Scientific & Technical Information Report Number: 59385
  • Archival Resource Key: ark:/67531/metadc691843

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 31, 1979

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  • Aug. 14, 2015, 8:43 a.m.

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McVey, D.F.; Lappin, A.R. & Thomas, R.K. Test results and supporting analysis of a near surface heater experiment in the Eleana Argillite, article, December 31, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc691843/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.