| Budget Amount *help |
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
In this study, we tried to develop a technique to separate / enrich tritium water, T2O, contained in radioactively contaminated water, using the difference in melting point from pure water H2O. In order to seperate / concentrate D2O from the D2O solution simulating T2O, an experimental apparatus was assembled, which is composed of a radiation cooling unit, an water freezing inner tank and a temperature stabilizing outer tank, and placed in a constant temperature water tank (range of -20 to 80 C, 0.01 C resolution), covered with a thermal insulating lid. Two approaches was made as follow: a freeze concentration method and a melting concentration method. As a result, it was found that the HDO enrichment to the solid phase tended to increase as the temperature of the water tank in the former case, and the maximum enrichment degree was 40% when the water tank temperature was 1.5 C. . In the latter method, the maximum enrichment to solid phase was 13% at 1.4 C.
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