STUDY ON PRACTICALLY OF PASSIVE AUTOCATALYTIC RECOMBINER TO REDUCE CONCENTRATION OF HYDROGEN GAS GENERATED IN LONG-TERM RADIOACTIVE WASTE STORAGE CONTAINERS BY RADIOLYSIS OF WATER

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<p>On the decommissioning of TEPCO’s Fukushima Dai-ichi nuclear power plant, fuel debris including water will be picked up from the bottom of the reactor vessels and packed into storage containers, and as a result hydrogen and oxygen will be generated by radiolysis of waters. Since hydrogen is flammable gas, it has a high risk of combustion and explosion. In order to reduce the hydrogen gas concentration and to secure long-term integrity of the storage container for fuel debris, Passive Autocatalytic Recombiner (PAR) was used. It consists of a spherical alumina as a base material and a small amount of platinum coated on the outer surface. Parametric experiments were conducted to clarify the controlling factors affecting the reduction of hydrogen concentration in the storage container with PAR, using a small-scale modeled experimental container. As controlling factors, the quantity of PAR, the installation position of PAR, the size of PAR, the amount of hydrogen generation, etc. were quantitatively evaluated. On the other hand, an analytical method based on the Arrhenius equation has been constructed to analyze the recombination chemical reaction between hydrogen and oxygen. Using this method, an analytical evaluation for the controlling factors was performed.</p>

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