中国物理B ›› 2025, Vol. 34 ›› Issue (12): 126101-126101.doi: 10.1088/1674-1056/ade42b
Intra-granular fission gas bubbles growth in crystalline U3Si2: Rate theory modeling
Cong Ma(马聪)1,2,3, Youheng Pei(裴有恒)2,4, Tianyuan Xin(信天缘)2,3, Dmitrii O. Kharchenko5, Vasyl O. Kharchenko5,6, Baoqin Fu(付宝勤)1, Qing Hou(侯氢)1, Changqing Teng(滕常青)2, and Lu Wu(吴璐)2,3,†
- 1 Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2 The First Sub-Institute, Nuclear Power Institute of China, Chengdu 610213, China;
3 National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China;
4 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
5 Institute of Applied Physics, National Academy of Sciences of Ukraine, 58 Petropavlivska St., 40000 Sumy, Ukraine;
6 Sumy State University, 116 Kharkivska St., 40007 Sumy, Ukraine
Intra-granular fission gas bubbles growth in crystalline U3Si2: Rate theory modeling
Cong Ma(马聪)1,2,3, Youheng Pei(裴有恒)2,4, Tianyuan Xin(信天缘)2,3, Dmitrii O. Kharchenko5, Vasyl O. Kharchenko5,6, Baoqin Fu(付宝勤)1, Qing Hou(侯氢)1, Changqing Teng(滕常青)2, and Lu Wu(吴璐)2,3,†
- 1 Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2 The First Sub-Institute, Nuclear Power Institute of China, Chengdu 610213, China;
3 National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China;
4 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
5 Institute of Applied Physics, National Academy of Sciences of Ukraine, 58 Petropavlivska St., 40000 Sumy, Ukraine;
6 Sumy State University, 116 Kharkivska St., 40007 Sumy, Ukraine
摘要： A model of intra-grain fission gas bubble growth in U3Si2 coupled with defect microstructure is generalized to take into account the influence of point defect sinks and defect clustering. The dynamics of bubble growth and defect structure properties are studied under different irradiation conditions. The influence of temperature and flux on bubble growth, defect ensemble evolution, and changes in material properties (elastic moduli and thermal degradation factor) are examined in detail. The universality of the bubble size distribution and the crossover of dynamical regimes of bubble growth are studied under various irradiation conditions. It is shown that a change in the dominant (fission gas atom- or vacancy-mediated) mechanism of bubble growth results in a crossover from a parabolic to a sub-parabolic bubble size growth law. The proposed modification of the rate theory model provides more accurate predictions and more detailed insight into fuel performance, especially fission gas behavior in crystalline U3Si2.
中图分类号: (Theory and models of radiation effects)
- 61.80.Az