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

枝尾 祐希; 佐藤 克美; 岩井 保則; 林 巧

Journal of Nuclear Science and Technology, 53(11), p.1831 - 1838, 2016/11

https://doi.org/10.1080/00223131.2016.1164637

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.