UO<sub>2</sub>燃料裂变气体渗流模型研究

李文杰; 齐飞鹏; 孙丹; 辛勇; 李权; 李垣明

doi:10.13832/j.jnpe.2022.03.0226

UO₂燃料裂变气体渗流模型研究

doi: 10.13832/j.jnpe.2022.03.0226

1.
中国核动力研究设计院核反应堆系统设计技术重点实验室，成都，610213
2.
中国核动力研究设计院，成都，610213

基金项目: 核反应堆系统设计技术重点实验室开放基金2019年基金（6142A07190101）

详细信息

作者简介:
李文杰（1986—），男，博士，高级工程师，现主要从事新型反应堆、新型核燃料科研工作，E-mail: lwj04@tsinghua.org.cn

中图分类号: TL334
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-25
- 录用日期: 2022-04-13
- 修回日期: 2022-03-30
- 刊出日期: 2022-06-07

Research on Percolation Models of UO₂ Fission Gas Release

1.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: 为分析UO₂燃料晶界气泡连通导致裂变气体间歇性释放的动力学过程，从而解决目前扩散模型预测的沿芯块径向释放份额与实验测量不符的问题，采用二维渗流模型模拟UO₂燃料晶界气泡网络的演化及与燃料棒内自由空间连通的释放过程。研究结果表明，渗流模型预测沿芯块径向的裂变气体释放份额在芯块中间部分出现局部峰值，并随着时间向芯块外侧推进，与辐照试验观察到不同燃耗下径向裂变气体分布现象定性符合。因此，本研究建立的渗流模型能够从机理上解释此前扩散模型未能预测的UO₂燃料裂变气体释放份额沿径向非单调分布现象。
- 模拟 /
- 核燃料 /
- 裂变气体释放 /
- 渗流
Abstract: In order to analyze the dynamic process of intermittent release of fission gas caused by UO₂ fuel grain boundary bubble connection, so as to solve the problem that the radial release share predicted by the current diffusion model is inconsistent with the experimental measurement, a two-dimensional percolation model is used to simulate the evolution of UO₂ fuel grain boundary bubble network and the release process connected with the free space in the fuel rod. The results show that the percolation model predicts that the share of fission gas released along the radial direction of the pellet shows a local peak in the middle part of the pellet, and advances to the outside of the pellet with time, which is qualitatively consistent with the radial fission gas distribution phenomenon observed in the irradiation test under different burnups. Therefore, the percolation model established in this study can explain the radial non-monotonic distribution of fission gas release share of UO₂ fuel that could not be predicted by the previous percolation model from the mechanism.
- Simulation /
- Nuclear fuel /
- Fission gas release /
- Percolation

HTML全文

图 1 UO₂燃料晶界示意图

Figure 1. UO₂ Fuel Grain Boundary Diagram

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图 2 渗流模型的晶界网络

Figure 2. Grain Boundary Network in Percolation Model

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图 3 渗流模型计算流程图

Figure 3. Diagram of Percolation Model

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图 4 饱和晶界及渗流团簇随时间的演化

Figure 4. Evolution of Saturated Grain Boundaries and Percolation Clusters with Time

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图 5 裂变气体释放份额沿径向的分布

Figure 5. Radial Distribution of Fission Gas Release Share

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图 6 t=860 d饱和晶界和裂变气体释放份额沿径向分布

Figure 6. Saturated Grain Boundaries and Radial Distribution of Fission Gas Release Share at t=860 d

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