量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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Detritiation system (DS) is the key system to ensure safety of a fusion reactor. DS must be designed to make sure of detritiation when an extraordinary event such as fire happens. DS comprises catalytic reactors to oxidize tritium and a system for removal of tritiated vapor. One of chemical components of tritium to be oxidized by the catalytic reactors is tritiated methane. Tritiated methane is oxidized by a high temperature reactor at 773K generally. Assuming that an accidental release of tritium and production of hydrocarbons by combustion of cables in case of fire occurs simultaneously, tritiated methane should be oxidized at lower temperature from the viewpoint of mitigation for temperature runaway of a catalytic reactor by heat of reaction of hydrocarbons combustion and tritium permeation through a catalytic reactor of DS. In addition, there is concern generation of tritiated methane by the reaction between tritium and methane in a catalytic reactor at low temperature. In the present study, we investigated experimentally a method of processing tritiated methane by a catalytic reactor at low temperature. Our experimental investigation indicated follows: 1) a generation of tritiated methane was sufficiently small; 2) tritiated methane could be oxidized below 773K by optimization of catalyst.
Investigation of generation of tritiated methane and processing by detritiation system in fusion reactor
