[3F10-15] Decommissioning of Accident Reactor

[3F15] Analytical Study of Hydrogen Behavior in a Radioactive Material Storage Container with Recombination Catalyst

*atsuhiko terada Terada¹, Ryuji Nagaishi¹ (1. Japan Atomic Energy Agency)

Keywords:hydrogen, radioactive material container, recombination catalyst, concentration reduction, Simulation

For long-term storage of radioactive materials such as fuel debris and waste in 1F decommissioning, if the storage container contains moisture, it is important to reduce the risk of explosion and combustion associated with hydrogen generation due to water radiolysis. As the safety management technology for this purpose, solid materials (catalysts) that reduce the hydrogen concentration in the gas phase in the container by recombination reaction, and The development of techniques for predicting and analyzing the behavior of hydrogen in a container by computational fluid dynamics (CFD) have been developed. In order to effectively combine these developments, it is necessary to couple recombination reactions with the flow of hydrogen in hydrogen behavior analysis. Therefore, in this study, Therefore, in this study, hydrogen behavior analysis was conducted with the recombination reaction by the catalyst, and the results were compared with the results of the performance test of the developed catalyst (intelligent catalyst), and the hydrogen concentration reduction effect of the catalyst was investigated.