Effect of fission products on the thermal conductivity of ThO2-A molecular dynamics study

被引：1
作者：
Wang, Ziqiang [1 ]
Yang, Chen [1 ]
Yu, Miaosen [2 ]
Ma, Wenxue [2 ]
Guo, Liyao [1 ]
Wei, Zhixian [2 ]
Gao, Ning [2 ,3 ]
Yao, Zhongwen [4 ]
Wang, Xuelin [2 ]
机构：
[1] Jilin Univ, Key Lab Engn B Engn, Minist Educ, Changchun 130022, Peoples R China
[2] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Key Lab Particle Phys & Particle Irradiat MOE, Qingdao 266237, Peoples R China
[3] Chinese Acad Sci, Inst Modern Phys, Lanzhou, Peoples R China
[4] Queens Univ, Dept Mech & Mat Engn, Kingston, ON K7L3N6, Canada
来源：
NUCLEAR MATERIALS AND ENERGY | 2024年 / 39卷
基金：
中国国家自然科学基金;
关键词：
Thorium dioxide; Fission products; Molecular dynamics; Thermal conductivity; Theoretical models; Dislocation loops; TRANSPORT-PROPERTIES; EDGE DISLOCATIONS; UO2; GAS; POTENTIALS; DIFFUSION; IMPACT; DAMAGE; BULK; HE;
D O I：
10.1016/j.nme.2024.101681
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Thermal conductivity (k), as an important thermal property of nuclear fuels, would be deteriorated due to fission products. Therefore, to investigate the effect of fission products on the thermal conductivity of nuclear fuels is essential. Two typical fission products: Xe and Kr with 0-2 % concentration are considered in this work. The lattice constants (L) of ThO2 increase due to fission products at all testing temperatures. The extent of increase in L due to Xe interstitials is the maximum. The fission products significantly reduce the thermal conductivity of ThO2. The extent of reduction in thermal conductivity of ThO2 by the defects follows the trend Xe (interstitials) > Xe (substitutional defects) > Kr (substitutional defects) > Kr (interstitials). Finally, the full-filled Xe/Kr bubble has a nearly identical thermal conductivity as an empty void or half-filled Xe/Kr bubble. The underlying reason may be that the thorium atoms have a lower mobility than uranium atoms. These calculated values can be used to predict the thermal properties of the irradiated ThO2.
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页数：12
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