Research On Physics Character Of Fusion-fission Hybrid And PWR Combined Fuel Cycle System

According to China's nuclear power long-term development plan, in2020China's total installed nuclear power capacity will be about70GW. With large-scale development of nuclear power, China also faces the problem of nuclear fuel supply and nuclear safety. Fusion-fission hybrid reactor is due to the use of14MeV high-energy neutrons which come from (DT) fusion, so it has unique advantage in producing nuclear fuel and transmutation of nuclear waste. Taking into account the advantages of fusion-fission hybrid reactor and problems of nuclear fuel supply and nuclear waste disposal, fusion-fission hybrid reactor and pressurized water reactor combined fuel cycle system concept was proposed. The main content of this thises is in the following:Development and production of improved BISONC database software program and produced a175group database BISONC transport and fuel consumption database library, and do a preliminary validation. The development of fusion-fission hybrid reactor neutron PWR combined cycle system analysis software NFFP (Neutronics calculation software for fusion-fission hybrid and PWR combined fuel cycle system). This software is based on the system for a more detailed physical characterization.(1) The program for production BISONC transport lib and burnup lib was developed, and three critical benchmark was calculated using the lib. Neutronics calculation software for fusion-fission hybrid and PWR combined fuel cycle system (NFFP)was developed.Based on this software package, the physical characterization of the system was detailed.(2) To deal with the problem large power density variation in the radial deviation in the blanket, power flattening theory was proposed. A generating electricity blanket concept using the PWR spent fuel directly was researched based on the power flattening theory, which was based on ITER parameter level achieve.The results show that the peak-to-average power factor becomes less than no power flattening, and the output power of the fuel zone raises more than21.7%. So, Powe flattening for blanket design becomes more economy, and lower engineering and technical demand comparing with no power flattening blanket design. (3) How to use the fusion-fission hybrid breeding fuel in the PWR is also a key technical problem in the system. The feasibility of using the fusion-fission hybrid breeding fuel in PWR were discussed. Preliminary study was focusing on the physics of using fusion-fission hybrid breeding fuel in the main reactor type â…¡ plus in China. Key parameters including reactor fuel temperature coefficient, moderator temperature coefficient, boron differential value of the reactor power and other parameters were analyzed in detail. The mixed thorium-based reactor fuel assemblies studies had been performed, and results shown that the features of fusion-fission breeding thorium-based similar to uranium fuel assemblies. Moreover, the component of MA in the fusion-fission hybrid breeding thorium-based fuel were significantly reduced, thereby reducing the likelihood of nuclear proliferation.(4)Based on the mature uranium-plutonium cycle technology, PWR loading MOX fuel was studied. natural uranium resources, our manufacturing capacity, the amount of spent fuel generated by nuclear power plants, the amount of separated plutonium and the use of other issues have been analyzed. The assumption that Fusion-Fission Hybrid Reactor fuel cycle system into our fuel cycle in2040, the analysis of the impact on demand of natural uranium and Pu separation of the cumulative amount of size. The cumulated amount of Pu and mathod of using the Pu were discussed.Physical characteristics of the fusion-fission hybrid reactor PWR combined cycle system was performed, and the research results is important for the sustainable development of China nuclear energy.