考虑晶界扩散和气泡联合的UO<sub>2</sub>燃料裂变气体模型

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考虑晶界扩散和气泡联合的UO₂燃料裂变气体模型

基金项目:

国家自然科学基金(11172068,91226101,11272092,11072062,91026005)

教育部博士点基金(20110071110013)

中国科学院战略性先导项目(XDA01020304)

1. Department of Mechanics and Engineering Science, Fudan University, Shanghai, 200433, China;
2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

摘要: 从改进的Booth模型出发,在晶粒的尺度下,考虑晶界上气体原子的重溶、晶界气泡的生长和联合、气体原子在晶界内的扩散、并考虑到静水压的作用,建立对裂变气体释放和肿胀进行求解的控制方程;建立对控制方程组进行求解的数值算法,编制预测核燃料内裂变气体行为的有限元程序。将该有限元结果与文献实验结果进行对比,验证了本文模型的有效性。
- 裂变气体 /
- 晶界扩散 /
- 重溶 /
- 裂变气体肿胀 /
- 裂变气体释放
Abstract: Based on the modified Booth model,the micro-scale governing equations for both the fission gas release and the gaseous swelling are established,considering the grain boundary resolution,the inter-granular bubble coalescence,the intragranular gas diffusion and the effect of hydrostatic pressure.The nu-merical method for solving the governing equations is developed,and the code for predicting the behavior of the fission gas in the nuclear fuel is built.By comparing the numerical results with the experimental data,the model in this paper is validated.
- Fission gas /
- Grain boundary diffusion /
- Fission gas swelling /
- Fission gas release /