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中文摘要：
提出了超临界水冷混合堆快谱区多层燃料组件设计方案。应用MCNP程序为该组件建立计算模型，并进行了相应的物理计算；同时运用子通道分析程序STAFAS对多层燃料组件子通道进行了初步的稳态热工分析。计算结果表明：超临界水冷混合堆快谱区多层燃料组件燃料转换比超过1．0，并且获得负的冷却剂空泡反应性系数；燃料包壳表面最高温度约为595℃，低于设计准则规定的上限值，同时组件各子通道出口冷却剂温度均匀性较好。通过对燃料棒径敏感性分析可知，较大棒径组件燃料转换比较大，但也会导致热通道包壳表面温度峰值升高。
英文摘要：
This paper proposes a multi-layer design of fuel assemblies for the fast zone of the SCWR mixed core. Both neutron-physical and thermal-hydraulic behavior of the multi-layer fuel assembly are analyzed using the MCNP code and the sub-channel analysis code STAFAS, respectively. The results show that with the proposed multi-layer structure the fast zone of the mixed core has breeding capability. At the same time, a negative void reactivity coefficient of coolant can be achieved. The peak temperature of fuel cladding is about 595 ℃, which is lower than the design limit. In addition, a well uniform distribution of the coolant temperature at the exit of the fuel assembly is obtained with the reference geometric parameters. A sensitivity analysis indicates that a larger fuel rod diameter leads to a higher conversion ratio, however,results in a higher peak temperature of fuel claddings.
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