抄録
In a severe accident at a nuclear power plant, a large amount of hydrogen can be released to primary containment vessel or reactor building. Passive autocatalytic recombiner (PAR) is one of the most effective systems for hydrogen mitigation and safety accident management. Conventional PARs which have been already installed in some of nuclear power plants have considerable weight and large casing volume. In order to improve these features, the new type PAR is under developing. The catalyst of the new PAR is developed based on the monolithic substrate catalyst for automobiles, which is high quality, compact and cost competitive. In this study, the steam effect on catalyst activity was experimentally examined using gas composition analysis and X-ray Absorption Fine Structure measurement (XAFS). These results show that the steam slightly affects the reaction start up and catalyst activity.
