After the Fukushima nuclear accident in Japan in 2011, the demand for new and innovative nuclear reactor technologies is increasing. The present work implements potential Accident Tolerant Fuels (ATF), U₃Si₂-FeCrAl, and innovative fuel designs, annular type, to small reactor systems. Neutronic analyses at both the assembly and core levels are performed for the traditional UO₂-Zr system and the candidate ATF U₃Si₂-FeCrAl systems with cylindrical fuel rod as well as the annular fuel rod design. The whole core level studies show that with 10% enrichment fuel, the lifetime of the annular fuel can achieve up to 55 MWd/kg, whereas those of the cylindrical U₃Si₂-FeCrAl system and the UO₂-Zr system are 60 and 67 MWd/kg, respectively. A larger thermal neutron penalty and higher ²³⁹Pu amount are observed in the ATF systems (more significant in the annular fuel design). Compared with the two cylindrical designs, the annular design leads to a higher power peak value and more heterogeneous power distribution in an assembly and in the core. The calculated negative fuel and moderator temperature coefficients throughout the whole life ensure the inherent safety of the core loaded with one of the three fuel assemblies. Therefore, the preliminary results indicate the rationality of the core design loaded with the traditional fuel and the U₃Si₂-FeCrAl system with both cylindrical and annular fuel designs.

2011 年日本福岛核事故后，对新型核反应堆技术的需求不断增加。目前的工作将潜在的容灾燃料 (ATF)、U ₃ Si ₂ -FeCrAl 和创新的环形燃料设计应用于小型反应堆系统。对传统的 UO ₂ -Zr 系统和具有圆柱形燃料棒以及环形燃料棒设计的候选 ATF U ₃ Si ₂ -FeCrAl 系统进行组件和堆芯级别的中子分析。整个堆芯级研究表明，在 10% 的浓缩燃料下，环形燃料的寿命可达 55 MWd/kg，而圆柱形 U ₃ Si ₂-FeCrAl 系统和 UO ₂ -Zr 系统分别为 60 和 67 MWd/kg。在 ATF 系统中观察到更大的热中子损失和更高的²³⁹ Pu 量（在环形燃料设计中更显着）。与两种圆柱形设计相比，环形设计导致更高的功率峰值和组件和核心中更不均匀的功率分布。在整个寿命期间计算出的负燃料和慢化剂温度系数确保装载三个燃料组件之一的堆芯的固有安全性。因此，初步结果表明装载传统燃料和U ₃ Si ₂的堆芯设计的合理性。-FeCrAl 系统，具有圆柱形和环形燃料设计。