The study evaluates the optimal thicknesses of the coating layers of an 800-μm UO₂ tri-structural isotropic coated fuel particle (TRISO) for a 10-MW_th block-type micro modular high temperature gas-cooled reactor (HTGR) using a response surface methodology (RSM) and an HTGR fuel performance analysis code, COPA. The objective function to be minimized in the optimal design of a TRISO consists of the product of the packing fraction of TRISO particles in a compact, the fractional releases of major metallic fission products from a TRISO and the failure probability of the silicon carbide (SiC) layers. A constraint on the sum of the coating layer thicknesses was made using a maximum packing fraction. Two fuel performance analyses such as a failure fraction analysis and a fission product release analysis are applied to the optimal designs of a TRISO that the RSM produced. An 800-μm UO₂ TRISO having buffer, inner high-density pyrocarbon (IPyC), SiC, outer high-density pyrocarbon (OPyC), each with a thickness of 110, 40, 57, 35 μm, or 120, 35, 60, 27 μm is suitable for the operation of a 10-MW_th block-type micro modular HTGR within 7600 days when both the SiC and through-coatings failure fractions do not occur and the fractional release of silver, cesium, strontium and krypton are below 1 × 10⁻⁹. The packing fraction of the optimal TRISOs in a compact is 40%.

该研究评估了 800-μm UO ₂三结构各向同性涂层燃料颗粒 (TRISO)涂层的最佳厚度，用于 10-MW _th使用响应面方法 (RSM) 和 HTGR 燃料性能分析代码 COPA 的块式微型模块化高温气冷反应堆 (HTGR)。在 TRISO 的优化设计中要最小化的目标函数由 TRISO 粒子在压块中的堆积分数、TRISO 主要金属裂变产物的释放分数和碳化硅 (SiC) 的失效概率的乘积组成层。使用最大填充率对涂层厚度总和进行限制。两种燃料性能分析，如失效分数分析和裂变产物释放分析，被应用于 RSM 生产的 TRISO 的优化设计。800-μm UO ₂TRISO有缓冲，内层高密度热碳（IPyC），SiC，外层高密度热碳（OPyC），厚度分别为110、40、57、35μm或120、35、60、27μm，适用于当碳化硅和穿透涂层失效分数不发生且银、铯、锶和氪的分数释放低于 1 × 10 ^-9时，10 MW _th块式微型模块化 HTGR 在 7600 天内运行。紧凑型中最佳 TRISO 的填充率为 40%。