11/20/2023 0 Comments Breeder nuclear fission reactorRegarding MAs, if an average of approximately 5% MAs is added to the fuel region, a transmutation rate of 10%/y or more is achieved without significantly affecting the core characteristics 7, 13. On the other hand, LLFPs are considered important in terms of the radiation safety performance (future exposure dose to the public) of the disposal site. In addition, the removal of MAs is said to be effective in reducing the area of the disposal site. By recovering and transmuting minor actinide nuclides, it is thought that the potential toxicity after 1000 years can be reduced to 1/100. In back-end research, MAs are the major elements of the potential toxicity of radioactive waste. To reduce radioactive waste, the amounts of minor actinides (MAs: 237Np, 241Am, 243Am, etc.) and long half-lived fission products (LLFPs: 99Tc, 129I, 79Se, etc.) must be reduced. For the effective use of uranium resources, the fast breeder reactor (FBR) can convert 238U to fissile material, such as 239Pu, with a breeding ratio of 1 or more. Important issues for nuclear power generation are the effective use of uranium resources and the reduction of radioactive waste while ensuring safety. By simultaneously breeding fissile materials and transmuting MAs and LLFPs in one fast reactor, it will be possible to solve the long-term issues of the nuclear power reactor system, such as securing nuclear fuel resources and reducing radioactive waste. As a result, it was clarified that in this fast breeder reactor, a breeding ratio of approximately 1.1 was obtained, and MAs and LLFPs achieved a support ratio of 1 or more. Breeding was achieved in the core and axial blanket. Transmutation was carried out by loading innovative Duplex-type MA fuel in the core region and LLFP-containing moderator in the first layer of the radial blanket. The purpose of this study was to show a concept that can simultaneously achieve the breeding of fissile materials and the transmutation of MAs and LLFPs in one fast reactor. Important radioactive wastes are minor actinides (MAs: 237Np, 241Am, 243Am, etc.) and long-lived fission products (LLFPs: 129I, 99Tc, 79Se, etc.). The long-term issues of nuclear power systems are the effective use of uranium resources and the reduction of radioactive waste.
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