Instrument evaluation, calibration, and installation for the heater experiments at Stripa

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Borehole instrumentation for the measurement of temperature, displacement, and stress was evaluated, modified, calibrated, and installed in an underground site at Stripa, Sweden where experiments are currently underway to investigate the suitability of granite as a storage medium for nuclear waste. Three arrays of borehole instrumentation measure the thermomechanical effects caused by electrical heaters which simulate the thermal output of canisters of radioactive waste. Because most rock mechanics investigations are carried out at modest temperatures, a sustained operating temperature as high as 200/sup 0/C was an unusual and most important criterion governing the instrumentation program. Extensive laboratory experiments were conducted ... continued below

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Pages: 187

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Schrauf, T.; Pratt, H.; Simonson, E.; Hustrulid, W.; Nelson, P.; DuBois, A. et al. December 1, 1979.

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Description

Borehole instrumentation for the measurement of temperature, displacement, and stress was evaluated, modified, calibrated, and installed in an underground site at Stripa, Sweden where experiments are currently underway to investigate the suitability of granite as a storage medium for nuclear waste. Three arrays of borehole instrumentation measure the thermomechanical effects caused by electrical heaters which simulate the thermal output of canisters of radioactive waste. Because most rock mechanics investigations are carried out at modest temperatures, a sustained operating temperature as high as 200/sup 0/C was an unusual and most important criterion governing the instrumentation program. Extensive laboratory experiments were conducted to determine the effect of high temperature on instrument behavior and also to develop calibration and data-reduction procedures. The rod extensometers were tested for anchor creep, the selection of a suitable high-temperature pressurizing fluid, and the thermal stability of the grout. Four temperature corrections are incorporated into the data reduction of the USBM borehole deformation measurement: the bridge voltage offset correction, the change in calibration factor induced by temperature, and the thermal expansion of the gage and of the rock. The vibrating wire gages were calibrated in the laboratory by loading gages installed in a granite block at pressures up to 13 MPa and at temperatures ranging from 20/sup 0/ to 200/sup 0/C. Both the slope and offset of the response equation are corrected for temperature effects. Most thermocouples were calibrated in an oven at the field site. Thermocouples were emplaced with individual gages and into holes backfilled with sand or grout.

Physical Description

Pages: 187

Notes

NTIS, PC A09/MF A01.

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  • Report No.: LBL-8313
  • Report No.: SAC-25
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/5267336 | External Link
  • Office of Scientific & Technical Information Report Number: 5267336
  • Archival Resource Key: ark:/67531/metadc1070045

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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.

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Creation Date

  • December 1, 1979

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 29, 2018, 1:14 p.m.

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Schrauf, T.; Pratt, H.; Simonson, E.; Hustrulid, W.; Nelson, P.; DuBois, A. et al. Instrument evaluation, calibration, and installation for the heater experiments at Stripa, report, December 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1070045/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.