IN SITUR REKA PROBE MEASUREMENTS AT FRAN RIDGE AND IN THE ESF Page: 2 of 8
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borehole, at low cost. A permanent REKA probe has to be grouted in the insertion
hole, if an open hole is not acceptable due to the disturbance it may cause to other
site characterization activities.
DESCRIPTION OF THE ACTUAL WORK
ESF Alcove 5 Measurements
Effective thermal conductivity and diffusivity measurements were taken at five
different locations in the Drift Scale Test bed at Yucca Mountain. The measurement
system employed includes a reusable REKA thermal probe, an HP3421A data
acquisition unit, and an HP71B controller. The REKA probe consists of a linear array
of 6 thermocouples, centered 0.025 m apart, and an integral heater which is powered
by 7 W using an HP3611A DC power supply. The thermocouples are mounted on a
flexible, expandable Kapton foil. Thin, flexible copper rings are formed under each
thermocouple sensor, for providing an average temperature reading along the
circumference of the borehole at each thermocouple location. The probe heater is
positioned near the rock wall surface and is centered 0.1 m from the closest
thermocouple of the array. The heater is mechanically expandable, for providing
sufficient thermal contact between the heating element and the rock surface.
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GEORGE DANKO, HARRY CREECH, JOHN PHILLIPS, AND SAI TIPPABHATLA. IN SITUR REKA PROBE MEASUREMENTS AT FRAN RIDGE AND IN THE ESF, report, November 14, 1997; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc717860/m1/2/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.