稠密栅堆芯再淹没先驱冷却区域换热模型研究

Study on Heat Transfer Prediction Models of Precursory Cooling Region in Reflooding Phase of Tight Lattice

以瑞士NEPTUN-LWHCR稠密栅堆芯再淹没实验为基础,总结稠密栅再淹没过程的特点,建立先驱冷却换热新模型,分析造成再淹没过程包壳峰值温度较高的原因。分析表明,稠密栅再淹没过程中先驱冷却较差主要原因是蒸汽冷却较差。包壳峰值温度的对比验证了先驱冷却换热新模型的合理性。

On the basis of the reflooding experiment NEPTUN-LWHCR performed in Switzerland, this paper summarized the characteristics of the reflooding phase of tight lattice, and analyzed the reasons for the high peak clad temperature. A new heat transfer model of precursory cooling is established. It is proposed that the steam cooling is relatively poor in the precursory cooling to make the peak clad temperature higher. Through validating this mew model by calculating the peak clad temperature, it can be concluded that the new model is reasonable.