Japan Atomic Energy Research Institute (JAERI) has been conducting an R&D on thermochemical water-splitting processes of Iodine-Sulfur family, which is a promising candidate of heat-utilization process of High Temperature Gas-cooled Reactors. Present activity at JAERI covers the following three subjects, (a) closed-loop operation technique for stable and continuous hydrogen production by e.g. suppressing possible side reactions, (b) process improvement in terms of thermal efficiency of hydrogen production utilizing membrane technologies, and (c) selection of materials for constructing the large-scale plant mainly focusing on corrosion resistance in the representative process environments. Recent progress on these studies is briefly described.

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