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Micro-chemical Probe: Powerful New Tool for Assessing Radioactive Waste Geological Disposal Sites |
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AUTHORS |
| Takuma Yoshida |
Nuclear Fuel Cycle Project Management Gr., Nuclear Power Business Development & Management Div.,Hitachi-GE Nuclear Energy, Ltd. |
| Akira Sasahira, Dr. Sc. |
Nuclear Power Chemical Project Fuel Cycle Gr., Power & Industrial Systems R&D Lab., Power Systems, Hitachi, Ltd. |
| Kenji Noshita |
Nuclear Power Chemical Project Fuel Cycle Gr., Power & Industrial Systems R&D Lab., Power Systems, Hitachi, Ltd. |
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OVERVIEW |
NUMO' s approach has been to call for municipalities to volunteer as candidate areas for the disposal of high-level radioactive wastes in Japan. The proposed sites are being subjected to a multi-step assessment process to determine their suitability starting with a survey of relevant literature, then proceeding with a surface evaluation, and finally an underground assessment of the sites. When investigating sites from the surface, deep boreholes are dug to ascertain the nature of the sites, but so far we have lacked the technology to directly measure distribution coefficients and other key geochemical properties that largely govern the migration behavior of radionuclides in rock strata, and have had to rely on measurements based on simulations of underground conditions done by test equipment on the surface. It was this fundamental limitation that motivated the present project to develop a micro-chemical probe capable of directly measuring deep subterranean conditions in a borehole.
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TO READ THIS ARTICLE |
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RELEVANT SITE |
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KEYWORDS |
micro reactor, in-situ measurement, geological disposal site, geochemical properties
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