Large-grain simulation fuel pellet of accident fault-tolerant fuel and preparation method of large-grain simulation fuel pellet

The invention relates to the technical field of nuclear fuel, in particular to a large-grain simulation fuel pellet of accident fault-tolerant fuel and a preparation method of the large-grain simulation fuel pellet, and the method comprises the following steps: sintering CeO2 powder in advance to prepare a CeO2 blank, placing the CeO2 blank in a mold filled with zirconium oxide powder, and then sintering at 1500-1550 DEG C to obtain the large-grain simulation fuel pellet of the accident fault-tolerant fuel. And meanwhile, the CeO2 pellet grains are prevented from being reduced into Ce2O3 by graphite, so that the large-grain CeO2 simulated fuel pellet is obtained. The large-grain simulated fuel pellet obtained through the method is high in density, the average grain size ranges from 101.3 micrometers to 165.4 micrometers, good structure and mechanical performance is achieved, the density ranges from 92.9% to 93.8%, and the Vickers hardness ranges from 6.62 GPa to 6.89 GPa. 本发明涉及核燃料技术领域，具体涉及一种事故容错燃料的大晶粒模拟燃料芯块及其