Closed-loop nuclear fuel has important strategic significance for the sustainable development of nuclear energy. Among them, spent fuel recycling is the core of a closed nuclear fuel cycle, which can increase the utilization rate of uranium resources, minimize radioactive waste, and properly resolve high levels of radioactive waste. Waste disposal and disposal issues. At present, the internationally recognized method for handling high-level radioactive waste is to convert long-lived, high-radioactive nuclide into a short-lived and moderately-lifetime or stable nuclide through an accelerator-driven subcritical reactor (ADS). PWR spent fuel is treated by high temperature oxidation and reduction to remove most of the volatile fission products. The remaining radioactivity mainly depends on U, Pu and Np, Am, Cm and other secondary tethered nuclides. The preparation of a method for regenerating nuclear fuel pellets containing a secondary steroid nuclide and a device therefor are the core steps for realizing the transmutation system.
The Institute of Variation in the Institute of Modern Physics, Chinese Academy of Sciences, in collaboration with the Institute of the Paul Scherrer (PSI) in Switzerland, systematically studied the chemical kinetics of the sol-gel process and found that the composition of the solution can be changed in a short time at room temperature. Complete the sol gel process. Thus, a rapid sol-gel method combining room-temperature instant-free cooling and microwave-assisted heating is proposed to prepare novel nuclear fuel pellets containing a secondary tethered nuclide in a glove box. Researchers at the PSI Institute of Modern Physics in Switzerland and the Institute of Modern Physics have separately set up an experimental platform for the preparation of nuclear fuel pellets containing secondary tethered nuclei, and successfully prepared a simulated nuclear fuel CeO2 pellet with a particle size of 500 μm. The method effectively avoids the radiation decomposition of the gel agent by the α and γ rays of the secondary tether radionuclide, and the generation of secondary organic radioactive waste liquid.
The research work was supported by the Chinese Academy of Sciences' strategic pilot technology project (A class) "Future Advanced Nuclear Fission Energy - Advanced Transmutation System" project and the National Natural Science Foundation of China. Related research results were published on Ceramics International.
Figure 1. Chemical kinetics of the sol-gel process
Figure 2. Schematic diagram of the sol-gel principle for the combination of immediate-uncooled mixing and microwave heating
Figure 3. CeO2 gel balls
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