Fuel Performance Analysis of Light Water Reactor Based on the Combination of U3Si2 Fuel and Two-Layer SiC Cladding Based on Multi-Physical Field Coupling
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摘要: 基于COMSOL平台开发了一套基于多物理场全耦合的燃料性能分析程序，并通过径向功率分布模型对比验证了该程序的正确性与准确性；然后进一步分析了U3Si2燃料与双层SiC包壳组合、U3Si2燃料与锆合金包壳组合在反应堆正常运行工况下的性能，并与UO2燃料与锆合金的组合进行了对比分析。计算结果发现U3Si2燃料与锆合金包壳组合相比UO2燃料与锆合金的组合具有更低的燃料中心温度、裂变气体释放量及内压，但气隙闭合时间会提前；而U3Si2燃料与双层SiC包壳的组合相比U3Si2燃料与锆合金的组合具有更高的燃料中心温度、更大的裂变气体释放量及内压，且随着燃耗的增加，其燃料中心温度大幅增加，与锆合金包壳相比，双层SiC包壳能够有效延迟气隙闭合，缓解燃料与包壳的力学相互作用。Abstract: Based on COMSOL platform, a fuel performance analysis program based on multi-physical field full coupling is developed, and the correctness and accuracy of the program are verified by comparing with the radial power distribution model; Then the performances of the combinations of U3Si2 fuel and two-layer SiC cladding, U3Si2 fuel and zirconium alloy cladding under normal reactor operating conditions are further analyzed and compared with the combination of UO2 fuel and zirconium alloy. The calculation results show that the combination of U3Si2 fuel and zirconium alloy cladding has lower fuel center temperature, fission gas release and internal pressure than that of UO2 fuel and zirconium alloy, but the air gap closing time will be earlier; The combination of U3Si2 fuel and two-layer SiC cladding has higher fuel center temperature, greater fission gas release and internal pressure than the combination of U3Si2 fuel and zirconium alloy, and its fuel center temperature increases significantly with the increase of burnup. Compared with zirconium alloy cladding, two-layer SiC cladding can effectively delay the closing of air gap and alleviate the mechanical interaction between fuel and cladding.
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Key words:
- U3Si2 fuel /
- Two-layer SiC cladding /
- Multi-physical field /
- Fuel performance
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图 3 二维轴对称UO2、U3Si2的几何模型和计算网格
PL—单个燃料芯块长度；Pr—燃料芯块半径；PP—燃料芯块间间距；Dg—气隙宽度；CT—包壳厚度；Z—轴向坐标；R—径向坐标
Figure 3. Geometric Model and Computational Grid of 2D Axisymmetric UO2 and U3Si2
图 4 CAMPUS程序与BISON程序对于径向功率分布因子的模拟结果的对比验证
Figure 4. Comparison and Verification of Simulation Results of Radial Power Distribution Factor between CAMPUS Program and BISON Program
图 5 U3Si2与锆合金组合的燃料中心温度、燃料外表面温度以及包壳内表面温度变化情况
Figure 5. Changes of Fuel Center Temperature, Fuel Outer Surface Temperature and Inner Surface Temperature of Cladding of U3Si2 and Zirconium Alloy Combination
图 6 U3Si2与锆合金组合的气隙大小变化情况
Figure 6. Air Gap Size Changes of U3Si2 and Zirconium Alloy Combination
图 7 U3Si2与锆合金组合的裂变气体释放量和内压变化情况
Figure 7. Fission Gas Release and Internal Pressure Changes of U3Si2 and Zirconium Alloy Combination
图 8 U3Si2燃料与双层SiC包壳组合的燃料中心温度、燃料外表面温度以及包壳内表面温度变化情况
Figure 8. Changes of Fuel Center Temperature, Fuel Outer Surface Temperature and Inner Surface Temperature of Cladding of U3Si2 Fuel and Two-layer SiC Cladding Combination
图 9 U3Si2与双层SiC包壳组合的气隙厚度变化情况
Figure 9. Air Gap Thickness Changes of U3Si2 and Two-layer SiC Cladding Combination
图 10 400 MW·h/kg(U)燃耗下U3Si2与双层SiC包壳组合的应力及形变分布情况
Figure 10. Stress and Deformation Distribution of U3Si2 and Two-layer SiC Cladding Combination at 400 MW·h/kg(U) Burnup
图 11 U3Si2与双层SiC包壳组合的裂变气体释放量和燃料元件内压变化情况
Figure 11. Changes of Fission Gas Release and Fuel Element Internal Pressure of U3Si2 and Two-layer SiC Cladding Combination
表 1 模型设定参数
Table 1. Model Setting Parameters
参数名 参数值 U3Si2−锆包壳 U3Si2−双层SiC包壳 有效燃料元件高度/cm 11.90 11.90 燃料芯块半径/mm 4.1 4.1 气隙厚度/μm 80 80 包壳内径/mm 8.36 8.36 包壳厚度/μm 570 750/250 包壳外径/mm 9.5 10.36 气腔与燃料高度比值 0.045 0.045 燃料富集度/% 4.9 4.9 初始燃料密度 95%T.D 95%T.D 线功率/(W·cm−1) 200 200 快中子注量率/(m2·s)−1 9.5×1017 9.5×1017 冷凝剂压力/MPa 15.5 15.5 冷却剂温度/K 530 530 初始氦气压强/MPa 2.0 2.0 T.D—燃料的理论密度 
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