3D Simulation of Fuel Performance with Missing Pellet Surface Defect
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摘要: 采用三维程序和一维半程序耦合分析的方法研究芯块掉块对燃料性能的影响。基于ABAQUS程序有限元分析平台建立三维燃料性能分析程序,并与一维半燃料性能分析程序COPERNIC进行对比验证。在此基础上,研究了典型II类瞬态工况下芯块掉块附近的燃料热-力学行为。研究结果表明:芯块掉块附近的包壳内表面温度相比周围的低,芯块掉块边缘对应的包壳内表面温度明显高于周围;芯块掉块附近的包壳出现应力集中,环向应力分布呈现典型的“平板弯曲”现象。
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关键词:
- 芯块掉块 /
- 芯块与包壳相互作用(PCI) /
- 有限元 /
- 燃料行为
Abstract: The effect of missing pellet surface（MPS） defect on fuel performance by coupling three dimensional code and one and half dimensional code is studied.The three dimensional fuel performance code is built based on ABAQUS software and compared with COPERNIC,a one and half dimensional fuel performance code.Based on this,the fuel performance near the MPS defect during typical condition II transient is studied.The result shows that the temperature of the cladding inner surface near MPS defect is lower than the surrounding and the temperature of cladding inner surface near the defect edge is significantly higher than the surrounding; There is stress concentration in the cladding around the defect and the cladding hoop stress distribution near the defect presents a typical "plate bending" phenomenon.-
Key words:
- Missing pellet surface defect /
- PCI /
- Finite element method /
- Fuel behavior
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