气冷堆用棱柱型弥散微封装燃料性能分析及优化研究

赵波; 李权; 李垣明; 黄永忠; 马强; 粟敏; 刘振海; 齐飞鹏; 马超; 陈浩

doi:10.13832/j.jnpe.2022.02.0089

气冷堆用棱柱型弥散微封装燃料性能分析及优化研究

doi: 10.13832/j.jnpe.2022.02.0089

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

基金项目: 国家重点研发计划资助（2020YFB1901900）；四川省应用基础研究项目（2021YJ0529）

详细信息

作者简介:
赵　波（1993—），男，助理工程师，工学硕士，现从事燃料元件性能分析与设计工作，E-mail: drsi_zhaobo@163.com

中图分类号: TL352
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出版历程
- 收稿日期: 2021-01-12
- 修回日期: 2021-06-15
- 刊出日期: 2022-04-02

Research on Analysis for Performance and Optimization of Prismatic Dispersed Microencapsulated Fuel in Gas-Cooled Reactor

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

摘要

摘要: 棱柱型弥散微封装燃料是将三重各向同性包覆（TRISO）燃料颗粒弥散于金属或陶瓷基体形成的颗粒增强复合燃料，具有良好的结构稳定性、裂变产物包容能力和辐照稳定性，是高温气冷堆中较具发展前景的燃料形式之一。本文提出将TRISO燃料颗粒弥散于SiC基体的棱柱型弥散微封装燃料设计方案，并基于有限元分析软件COMSOL建立了该燃料元件三维热流固耦合分析模型，初步实现了该燃料元件性能分析和优化设计。结果表明，棱柱型弥散微封装燃料元件的温度最大值位于燃料元件外侧，应力峰值位于冷却剂通道壁面，边距比为0.76~0.84、孔距比为0.68~0.75时燃料元件热应力最小。本文建立的棱柱型弥散微封装燃料性能分析方法和研究结论，可为后续该型气冷堆燃料元件设计提供指导和参考。
- 棱柱型 /
- 弥散微封装燃料 /
- COMSOL /
- 热流固耦合 /
- 优化
Abstract: Prismatic dispersed microencapsulated fuel is a particle-reinforced composite fuel which is formed by TRISO fuel particles dispersed in metal or ceramic matrix. It has good structural stability, fission product inclusion capacity and irradiation stability, and it is one of the promising fuels in high temperature gas-cooled reactor. A prismatic dispersed microencapsulated fuel with TRISO particles dispersed in SiC matric was proposed in this paper. Based on the finite element analysis software COMSOL, the 3D thermal-fluid-solid coupling analysis model of the fuel element is established, and the performance analysis and optimization design of the fuel element are preliminarily realized. The results show that the maximum temperature of the prismatic dispersed microencapsulated fuel element is located on the outside of the fuel element, the peak stress is on the wall of the coolant channel, and the thermal stress of the fuel element is the lowest when the edge-distance ratio is 0.76 to 0.84 and the hole-distance ratio is 0.68 to 0.75. The performance analysis method and research conclusions of the prismatic dispersed microencapsulated fuel established in this paper can provide guidance and reference for the subsequent design of this type of gas-cooled reactor fuel element.
- Prismatic /
- Dispersed microencapsulated fuel /
- COMSOL /
- Thermal-fluid-solid coupling /
- Optimization

HTML全文

图 1 棱柱型弥散微封装燃料元件

Figure 1. Prismatic Dispersed Microencapsulated Fuel Element　　　　　　

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图 2 热流固耦合计算流程

Figure 2. Flow Chart of Thermal-Fluid-Solid Coupling Calculation　　　　

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图 3 棱柱型燃料元件有限元模型（轴向视图比例1/20）

Figure 3. Finite Element Model of Prismatic Fuel Element (Axial View Scale is 1/20)

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图 4 燃料元件功率分布

Figure 4. Power Distribution of Fuel Element

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图 5 燃料元件轴向温度分布

Figure 5. Axial Temperature Distribution of Fuel Element

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图 6 燃料元件冷却剂出口处径向温度分布

Figure 6. Radial Temperature Distribution at Fuel Element Coolant Outlet

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图 7 燃料元件应力分布

Figure 7. Stress Distribution of Fuel Element

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图 8 冷却剂流速及功率密度随边距比及孔距比变化

Figure 8. Coolant Velocity and Power Density Change With Edge-Distance Ratio and Hole-Distance Ratio

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图 9 燃料元件最高温度随边距比及孔距比变化

①~⑨分别表示孔距比为0.5000、0.5556、0.6154、0.6800、0.7500、0.8281、0.9091、1.0000、1.10000，下同

Figure 9. Maximum Temperature of Fuel Element Changing With Edge-Distance Ratio and Hole-Distance Ratio

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图 10 燃料元件最高应力随边距比及孔距比变化

Figure 10. Maximum Stress of Fuel Element Changing With Edge-Distance Ratio and Hole-Distance Ratio

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表 1 材料性能参数

Table 1. Material Performance Parameters

材料	热导率/(W·m⁻¹·K⁻¹)	热膨胀系数/K⁻¹	弹性模量/GPa	泊松比
UO₂核芯	Lucuta修正模型^[12]	式（1）	式（2）	0.316
Buffer层	0.5	3.5×10⁻⁶	式（3）	0.23
IPyC层	4	5.5×10⁻⁶	式（4）	0.23
SiC层	式（5）	式（6）	式（7）	0.13
OPyC层	4	5.5×10⁻⁶	式（4）	0.23
SiC基体	式（5）	式（6）	式（7）	0.13

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