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http://dx.doi.org/10.7733/jnfcwt.2016.14.2.135

Measurement of Properties of Domestic Bentonite for a Buffer of an HLW Repository  

Yoo, MalGoBalGaeBitNaLa (Korea Atomic Energy Research Institute)
Choi, Heui-ju (Korea Atomic Energy Research Institute)
Lee, Min-soo (Korea Atomic Energy Research Institute)
Lee, Seung-yeop (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.14, no.2, 2016 , pp. 135-147 More about this Journal
Abstract
The buffer in geological disposal system is one of the major elements to restrain the release of radionuclide and to protect the container from the inflow of groundwater. The buffer material requires long-term stability, low hydraulic conductivity, low organic content, high retardation of radionuclide, high swelling pressure, and high thermal conductivity. These requirements could be determined by the quantitative analysis results. In case of South Korea, the bentonites produced in Gyeongju area have been regarded as candidate buffer/backfill materials at KAERI (Korea Atomic Energy Research Institute) since 1997. According to the study on several physical and chemical characteristics of domestic bentonite in the same district, this is the Ca-type bentonite with about 65% of montmorillonite content. Through this study, we present the criteria for the performance evaluation items and methods when collecting new buffer/backfill materials.
Keywords
Domestic bentonite; Buffer; Geological disposal system; Engineered barrier; Ca-bentonite;
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