Numerical investigation on the dissolution kinetics of ZrO2 by molten zircaloy using MPS method

被引:14
作者
Chen, Ronghua [1 ]
Li, Yonglin [1 ]
Guo, Kailun [1 ]
Tian, Wenxi [1 ]
Qiu, Suizheng [1 ]
Su, G. H. [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Nucl Sci & Technol, Shaanxi Key Lab Adv Nucl Energy & Technol, Xian 710049, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Dissolution; MPS method; ZrO2-Zr system; Mass diffusion; Parabolic law; CONVECTION HEAT-TRANSFER; CORIUM POOLS; SIMULATION; BEHAVIOR; COPRA; SPH;
D O I
10.1016/j.nucengdes.2017.05.002
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
During the postulated core meltdown accident of the nuclear reactor which employs the dispersion plate type fuel, the UO2 microspheres would be dissolved by the molten zirconium, and the dissolution process is accelerated by the mass diffusion phenomenon. In this study, the dissolution model, based on the Fick's second law and the dissolution criteria, was developed and incorporated into the Moving Particle Semi implicit (MPS) method. To validate the dissolution model, the one-dimensional mass diffusion problem was simulated by the improved MPS code. The study of numerical convergence was also performed based on the sensitivity analysis of the particle size. The distribution of the oxygen predicted by the improved MPS agreed well with the analytical solution for the particle size of 0.5 mm. Then the improved MPS was adopted to analyze the dissolution kinetics of the three-dimensional ZrO2-Zr system in this study. The oxygen concentration and the interface displacement of the ZrO2-Zr system were considered, and the simulation results indicate that the behavior of ZrO2 dissolution caused by molten zircaloy follows the parabolic law. The improved MPS method is proved to be capable of simulating the dissolution process and the induced phase change. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:117 / 125
页数:9
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