The closed nuclear fuel cycle has important strategic significance for the sustainable development of nuclear energy[1].The reutilization of spent fuel is the most important step of the closed nuclear fuel cycle.It can improve the utilization rate of uranium resources,minimize the amounts of radioactive wastes and solve the geological disposal problem of the high-level radioactive wastes efficiently.There are many strategies for the handling of radioactive wastes,among which transmutation is considered as the most effective and environment-friendly solution.Sub-critical accelerator driven system(ADS)is a potential way to transmute long-lived nuclides into short-lived or stable nuclides by the fast neutrons[2].For the spent fuel from pressured-water nuclear power plants(NPP),most of the volatile fission products can be removed by the high-temperature oxidation-reduction process.The radioactivity comes from the remaining uranium(U),plutonium(Pu)and long-lived minor actinides(MAs)including neptunium(Np),americium(Am),and curium(Cm).Therefore,an important issue is the fabrication of ceramic nuclear fuel with a high fraction of MAs and Pu for ADS reactors.
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