Experiment Study on Rod Drop Performance of CF Series Fuel Assembly
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摘要: 介绍了我国具有完全自主知识产权的CF系列燃料组件的设计和改进特点，通过开展1∶1的冷态和热态堆外模拟试验获得了CF系列燃料组件在不同工况下的落棒时间、落棒速度、落棒冲击力等性能参数，并对比了CF2与CF3燃料组件、CF2S与CF3S燃料组件的落棒性能差异。试验结果表明，CF3系列燃料组件相对于CF2系列燃料组件的落棒时间更长、落棒冲击力更小，导向管结构的改进对落棒缓冲时间的影响更大。试验结果验证了设计改进的实际效果，为CF系列燃料组件的实堆应用和发展提供了支撑。Abstract: The design and improvement characteristics of CF series fuel assemblies with completely independent intellectual property rights in China are introduced in this paper. The performance parameters of CF series fuel assemblies such as rod drop time, rod drop velocity and rod drop impact force under different conditions are obtained through 1∶1 cold and hot out-of-core simulation tests, and the differences in rod drop performance between CF2 and CF3 fuel assemblies, as well as between CF2S and CF3S fuel assemblies are compared. The experiment results show that CF3 series fuel assemblies have a longer rod drop time and a lower rod drop impact force compared with CF2 series. The improvement of guide tube structure has a greater influence on rod drop buffer time. The experimental results validate the effectiveness of the design improvements and provide support for the practical reactor application and further development of CF series fuel assemblies.
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Key words:
- CF series fuel assembly /
- Rod drop time /
- Rod drop velocity /
- Rod drop impact force
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图 1 全尺寸CF系列与截短型CF系列燃料组件结构示意图
Figure 1. Schematic Diagram of Structure for Full-size CF and Truncated CF Fuel Assemblies
图 3 燃料组件落棒性能试验装置流程示意图
Figure 3. Schematic Diagram of the Fuel Assembly Rod Drop Performance Test Device
图 5 CF2和CF3燃料组件不同流量下落棒时间对比
Figure 5. Comparison of Rod Drop Time for CF2 and CF3 Fuel Assemblies with Different Flow Rates
图 6 2种类型燃料组件缓冲时间差异对比
Figure 6. Comparison of Buffer Time Differences between Two Types of Fuel Assemblies
图 8 2种类型燃料组件的落棒冲击力对比
Figure 8. Comparison of Rod Drop Impact Forces of Two Fuel Assemblies
表 1 CF系列燃料组件结构对比
Table 1. CF Series Fuel Assembly Structure Comparison
结构特征 CF2 CF2S CF3 CF3S 包壳材料 Zr-4 Zr-4 N36 N36 总体长度/mm 约4100 约2550 约4100 约2550 格架数量 11 8 11 8 导向管壁厚/mm 0.5 0.5 0.6 0.6 导向管结构 管中管胀接结构 管中管胀接结构 导向管内径 r 0.9825r 内层管长度 h 0.9939h 轴肩螺钉孔长度 L 1.2352L 
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