触媒金属を担持させたセラミック増殖材からのトリチウム放出率の増加

概要

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In most current designs of D-T fusion reactor blankets employing ceramic breeder materials， the use of a helium sweep gas containing O.1％of hydrogen is contemplated to extract tritium efficiently via isotopic exchange reactions． However， at lower temperatures， the release process of tritium from the breeders is rather slow. For this reason， there is still a need to develop techniques that contribute to the enhancement of the recovery of bred tritium． In order to obtain an improved recovery of tritium from a blanket over wide ranges of temperature， the effect of catalytically active metal additives on the heterogeneous isotope exchange reactions at the breeder-sweep gas interface was examined， Platinum and palladium were deposited on solid breeder material pebbles（Li_4SiO_4）by the incipient wet impregnation method． Cold experiments with hydrogen and predeuterated water were performed using packed bed reactors and gas chromatographic analysis systems． Out of pile tritium release experiments were also conducted． using ceramic breeders irradiated in a research reactor． The experimental results reveal that the addition of catalytic additive metals is very effective to increase the tritium release rate from ceramic breeder materials especially at comparatively lower temperatures．
2000-03-30