Abstract

The Single Heater Test (SHT) is being conducted as an integral part of the testing and studies by the US Department of Energy to evaluate the suitability of Yucca Mountain in Nevada as a potential site for a deep geologic repository for the permanent disposal of spent nuclear fuel and high level nuclear waste. The objective of the SHT is to study the thermo-hydrologic, thermo-mechanical, and thermochemical responses of the Topopah springs tuff in Yucca Mountain. This paper describes electrical resistance tomography (ERT) surveys made during the SHT to map changes in electrical resistivity caused by temperature and moisture changes in the rock mass. The subsequent interpretation of this data to produce images of moisture distribution in the rock mass is also presented. Of particular interest are the formation and movement of condensate within the fractured rock.

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