Study of the Hexagonal Block Fuel Subassembly with Vertical Coolant Flow Fabrication Facility for He Gas Cooled Reactor

Tozawa, Katsuhiro*; Yamada, Hiroyuki*; Ozaki, Hiroshi*; Suzuki, Yoshihiro*

Hexagonal block fuel subassembly dispersing coated particle nitride fuel fabrication facility for Helium gas cooled reactor on the Feasibility Study for FBR fuel cycle systems has been investigated to reflect plant design considering detail effect of nitride fuel and remote handling and to evaluate waste production and plant cost. Results of the study are follows.(1) Research for hexagonal block fuel fabrication plant concept Material balance was settled considering with coated particle with TiN layer and SiC layer. System configuration was settled based on capacity and number of each equipments. Production method of the hexagonal block is hexagonal block flame capped SiC plate after vibration compaction in vertical position at core particle section and vibration compaction in horizontal position at blanket particle section. Production facility of the hexagonal block is embodied.Fuel subassembly is made by the hexagonal block screwed shut with entrance nozzle and handling head. Inspection items of hexagonal block are picked up and density inspection method is settled in X-ray CT scanning.Reagent recovery system is settled based on the system of sphere packing method.(2) Data evaluation for system assessment Radioactive gaseous waste, liquid waste, and solid waste in the main process, analysis process and maintenance process are evaluated. From the result, it made clear that radioactive gaseous waste and liquid waste are decreased by recovering IPA, nitric acid, ammonia water in reagent recovery process.Cost of equipment of the plant and operation cost have been estimated. Main process equipment cost occupies 21% of construction cost. Cost of radioactive waste treatment process, analysis process, maintenance facilities, instrumentation facilities and utility, occupy 35% of it. Cost of building, electrical equipment and ventilating system occupy 34% of it. New fuel storage facility occupies 10% of it.