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高温气冷堆一回路的放射性物质主要取决于包覆燃料颗粒在燃料元件制造过程中和辐照条件下的破损率，畸形ＵＯ２芯核（椭球状、带小尾巴形和连体等）是燃料元件制造过程中包覆燃料颗粒发生破损的主要原因之一，因此燃料元件设计中，畸形ＵＯ２芯核的份额要求小于１×１０－４，即在９５％的置信度下，在随机抽取的近３００００个ＵＯ２芯核中不允许有１个畸形芯核。报道了检查畸形芯核的抽样方案和检验方法，该方法是将随机抽取的样品通过一块平板，控制平板的倾斜度、振幅和频率，可以有效地将畸形芯核从样品中分离出来。实践表明该方法速度快，结果可靠，将用于１０ＭＷ高温气冷堆燃料元件的生产。
The radioactive material in the first circuit of the HTGR mainly depends on the breaking rate of the coated fuel particles in the manufacturing process of the fuel element and under the irradiation conditions. The deformed UO2 core (ellipsoid, small tail shape, Therefore, in the design of fuel elements, the fraction of deformity UO2 core needs to be less than 1 × 10-4, that is, under the 95% confidence level, in the randomly drawn near 30,000 UO2 core does not allow a deformity core. The sampling scheme and test method for inspecting deformed core were reported. The method was to separate the deformed core from the sample effectively by passing a randomly selected sample through a plate and controlling the inclination, amplitude and frequency of the plate. Practice shows that the method is fast and reliable, and will be used for the production of fuel components of 10MW HTGR.