Basic Study on Reduction of Hydrogen Concentration by a Passive Autocatalytic Recombiner Installed in a Seated Container

Abstract

In the decommissioning of the Fukushima Dai-ich nuclear power plant, the long-term safe storage of fuel debris is necessary. In this process, hydrogen generates by radiolysis of water due to radiation of fuel debris. Therefore, reducing the concentration of hydrogen.is important to ensure the safety of the storage container. Then, it was proposed that the generated hydrogen and the existed oxygen in the container are recombined with the passive autocatalytic recombiner (PAR) installed in the container and returned to water. Basic study was performed to confirm the effectiveness of a small sealed container with PAR on reduction of the hydrogen concentration.