棒束及格架布置对燃料组件搅混特性影响的实验研究

Experimental Research of Bundle and Spacer Grid Arrangement on Fuel Assembly Mixing Characteristics

1.
Nuclear Power Technology Research Institute of China, Shenzhen, Guangdong, 518000, China
2.
School of Energy and Environment, Southeast University, Nanjing, 210096, China

摘要: 以CPR1000核电机组使用的格架组装的5×5棒束燃料组件为对象，开展了多组全长棒束燃料组件搅混特性实验，重点分析了冷-热棒布置形式、格架布置形式等几何参数对燃料组件搅混特性的影响规律，实验结果表明，冷-热棒中心对称布置时的燃料组件热扩散系数更接近真值；跨间搅混格架对燃料组件总体热扩散系数有较小增强作用，但对于棒束压降的贡献很低。
- 燃料组件 /
- 5×5棒束 /
- 热扩散系数 /
- 几何参数
Abstract: Taking the 5×5 bundle fuel assembly assembled with the spacer grid used in CPR1000 nuclear power unit as the object, experiments on the mixing characteristics of several groups of full-length bundle fuel assembly were carried out. The effects of geometric parameters such as cold-hot rod arrangement and spacer grid arrangement on the mixing characteristics of fuel assembly are analyzed emphatically. The experimental results show that the thermal diffusion coefficient of the fuel assembly is closer to the true value when the cold-hot rods are symmetrically arranged in the center; The inter-span mixing spacer grid has a small enhancement effect on the overall thermal diffusion coefficient of fuel assembly, but its contribution to the pressure drop of bundle is very low.
- Fuel assembly /
- 5×5 bundle /
- Thermal diffusion coefficient /
- Geometrical parameters

图 1 实验装置流程图

Figure 1. Flow Chart of Experimental Device

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图 2 实验本体结构示意图

Figure 2. Schematic Diagram of Test Section

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图 3 燃料组件冷热棒布置方案

Figure 3. Hot and Cold Rod Arrangement Scheme of Fuel Assembly

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图 4 冷-热棒不同布置形式下热扩散系数比较结果

Figure 4. Comparison of Thermal Diffusion Coefficient with Different Hot and Cold Bundle Arrangement Forms

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图 5 子通道出口温度实验值与计算值比较

A~F子通道在横向方向的位置；a~f子通道在径向方向的位置

Figure 5. Experimental Value vs Calculated Value of Subchannel Outlet Temperature

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图 6 格架布置类型说明

Figure 6. Description of the Type of Spacer Grid Arrangement

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图 7 MSMG对热扩散系数影响

Figure 7. Influence of MSMG on Thermal Diffusion Coefficient　　　　　　

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图 8 MSMG对棒束压降的影响

Figure 8. Influence of MSMG on Pressure Drop of Bundle　　　　　

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