Reliability of instrumentation in a simulated nuclear-waste repository environment

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Description

In light of the observed performance of the geotechnical instrumentation deployed on the Spent Fuel Test-Climax (SFT-C), the following conclusions and recommendations are offered. Further research is required to fully understand the observed failures of linear potentiometers utilized in sealed or partially ventilated extensometer head assemblies. Based on our field observations, we recommend deploying Schaevitz LVDTs or proximeters as extensometer transducers where a sealed head assembly is required. The user must be cognizant of the potential drift and thermal instabilities of these units, however. The first-generation wire extensometers and fracture monitors developed for this test are an accurate, reliable means ... continued below

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11 p.

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Patrick, W.C. & Rector, N.L. June 1, 1983.

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Description

In light of the observed performance of the geotechnical instrumentation deployed on the Spent Fuel Test-Climax (SFT-C), the following conclusions and recommendations are offered. Further research is required to fully understand the observed failures of linear potentiometers utilized in sealed or partially ventilated extensometer head assemblies. Based on our field observations, we recommend deploying Schaevitz LVDTs or proximeters as extensometer transducers where a sealed head assembly is required. The user must be cognizant of the potential drift and thermal instabilities of these units, however. The first-generation wire extensometers and fracture monitors developed for this test are an accurate, reliable means for measuring convergence and discrete joint motion, respectively. The improved hermetically sealed vibrating-wire stressmeters function reliably. Calibration of the gauge remains difficult and further work is warranted in this area. Utilization of a single lot of sheathed thermocouples in a zone box configuration is a cost-effective, accurate, and reliable means of measuring temperatures in the repository environment. Care must be taken to tailor the sheath composition to the test thermal and chemical environment. Monitoring and post-test studies will continue at the SFT-C through 1984. Included in these studies will be post-test calibrations of all accessible instrumentation. A final report on the performance of the field instrumentation will be prepared at that time.

Physical Description

11 p.

Notes

NTIS, PC A02/MF A01; OSTI as DE83013584

Source

  • International symposium on field measurements in geomechanics, Zurich (Switzerland), 5-8 Sep 1983

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  • Other: DE83013584
  • Report No.: UCRL--88806
  • Report No.: CONF-830977--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 59278
  • Archival Resource Key: ark:/67531/metadc690669

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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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  • June 1, 1983

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 23, 2016, 12:03 p.m.

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Patrick, W.C. & Rector, N.L. Reliability of instrumentation in a simulated nuclear-waste repository environment, article, June 1, 1983; California. (digital.library.unt.edu/ark:/67531/metadc690669/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.