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Effect of hydrocarbons on the efficiency of catalytic reactor of detritiation system in an event of fire

火災時のトリチウム除去系における触媒塔のトリチウム酸化効率に対する炭化水素の影響

枝尾 祐希; 佐藤 克美; 岩井 保則; 林 巧

Edao, Yuki; Sato, Katsumi; Iwai, Yasunori; Hayashi, Takumi

Detritiation system of a nuclear fusion plant is mandatory to be designed and qualified taking all the possible extraordinary situations in addition to that in a normal condition carefully into consideration. We focused on the change in efficiency of tritium oxidation of a catalytic reactor in an event of fire where the air accompanied with hydrocarbons, water vapor and tritium is fed into a catalytic reactor at the same time. Our test results indicated; (1) tritiated hydrocarbon produces significantly by reaction between tritium and hydrocarbons in a catalytic reactor; (2) there is little possibility of degradation in detritiation performance due to tritiated hydrocarbons produced in the catalyst reactor are combusted; (3) there is no possibility of uncontrollable rise in temperature of the catalytic reactor by heat of reactions; and (4) saturated water vapor enables to poison the catalyst temporarily and degrades the detritiation performance. Our investigation indicated a saturated water vapor condition without hydrocarbons would be the dominant scenario to determine the amount of catalyst for the design of catalytic reactor of the detritiation system.

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