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Title: Electrical resistivity monitoring of the single heater test in Yucca Mountain FY98 -- 1st quarter results

Abstract

Of the several thermal, mechanical and hydrological measurements being used to monitor the rockmass response in the Single Heater Test, electrical resistance tomography (ERT) is being used to monitor the movement of liquid water with a special interest in the movement of condensate out of the system. Images of resistivity change were calculated using data collected before, during and after the heating episode. This report will concentrate on the results obtained after heating ceased; previous reports discuss the results obtained during the heating phase. The changes recovered show a region of increasing resistivity approximately centered around the heater as the rock mass cooled. The size of this region grows with time and the resistivity increases become stronger. The increases in resistivity are caused by both temperature and saturation changes. The Waxman Smits model has been used to calculate rock saturation after accounting for temperature effects. The saturation estimates suggest that during the heating phase, a region of drying forms around the heater. During the cooling phase, the dry region has remained relatively stable. Wetter rock regions which developed below the heater during the heating phase, are slowly becoming smaller in size during the cooling phase. The last set of imagesmore » indicate that some rewetting of the dry zone may be occurring. The accuracy of the saturation estimates depends on several factors that are only partly understood.« less

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Civilian Radioactive Waste Management, Washington, DC (United States)
OSTI Identifier:
350824
Report Number(s):
UCRL-ID-129747
ON: DE98054156; TRN: AHC29921%%7
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 13 Jan 1997
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; PROGRESS REPORT; YUCCA MOUNTAIN; RADIOACTIVE WASTE FACILITIES; SITE CHARACTERIZATION; HYDROLOGY; RESISTIVITY SURVEYS; RESERVOIR ROCK; HEATING; WATER SATURATION; RESPONSE FUNCTIONS

Citation Formats

Daily, A R.W. Electrical resistivity monitoring of the single heater test in Yucca Mountain FY98 -- 1st quarter results. United States: N. p., 1997. Web. doi:10.2172/350824.
Daily, A R.W. Electrical resistivity monitoring of the single heater test in Yucca Mountain FY98 -- 1st quarter results. United States. https://doi.org/10.2172/350824
Daily, A R.W. 1997. "Electrical resistivity monitoring of the single heater test in Yucca Mountain FY98 -- 1st quarter results". United States. https://doi.org/10.2172/350824. https://www.osti.gov/servlets/purl/350824.
@article{osti_350824,
title = {Electrical resistivity monitoring of the single heater test in Yucca Mountain FY98 -- 1st quarter results},
author = {Daily, A R.W.},
abstractNote = {Of the several thermal, mechanical and hydrological measurements being used to monitor the rockmass response in the Single Heater Test, electrical resistance tomography (ERT) is being used to monitor the movement of liquid water with a special interest in the movement of condensate out of the system. Images of resistivity change were calculated using data collected before, during and after the heating episode. This report will concentrate on the results obtained after heating ceased; previous reports discuss the results obtained during the heating phase. The changes recovered show a region of increasing resistivity approximately centered around the heater as the rock mass cooled. The size of this region grows with time and the resistivity increases become stronger. The increases in resistivity are caused by both temperature and saturation changes. The Waxman Smits model has been used to calculate rock saturation after accounting for temperature effects. The saturation estimates suggest that during the heating phase, a region of drying forms around the heater. During the cooling phase, the dry region has remained relatively stable. Wetter rock regions which developed below the heater during the heating phase, are slowly becoming smaller in size during the cooling phase. The last set of images indicate that some rewetting of the dry zone may be occurring. The accuracy of the saturation estimates depends on several factors that are only partly understood.},
doi = {10.2172/350824},
url = {https://www.osti.gov/biblio/350824}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 13 00:00:00 EST 1997},
month = {Mon Jan 13 00:00:00 EST 1997}
}