Immobilization of Radioactive Wastes in Hydrothermal Synthetic Rock, (III) : Properties of Waste Form Containing Simulated High-Level Radioactive Waste
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概要
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The high-level radioactive waste form (21.8 w/o waste, 47.7 w/o a-quartz, 20.5 w/o amorphous aluminosilicate, 10 w/o Al (OH)<SUB>3</SUB>) was produced with the addition of 10-N NaOH solution under hydrothermal hot-pressing conditions at 350°C and 66 MPa for 6 h. In order to characterize the waste form, following tests and measurements were performed : Soxhlet flow leach tests (97°C), static leach tests in deionized water at low temperatures (40, 90°C) and under hydrothermal conditions (100350°C), crystalline phase determination, microstructure ob-servation, compressive strength measurement, weight loss measurement by heat treatment and thermal conductivity measurement.<BR>The waste form was mainly composed of a-quartz and had porous structure. As for leach rates determined by static low temperature leach tests, the leach rates of the waste form were much lower than a concrete form but slightly higher than a glass form. The waste form was stable under hydrothermal conditions in comparison with a glass form. It had high compressive strength and thermal resistance. Its thermal conductivity was higher at room temperature than that of a glass form.
著者
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Yanagisawa Kazumichi
Research Laboratory Of Hydrothermal Chemistry Faculty Of Science Kochi University
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Yamasaki Nakamichi
Research Laboratory Of Hydrothermal Chemistry Faculty Of Science Kochi University
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NISHIOKA Mamoru
Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University
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