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用带有高过冷沸腾模型的ＲＥＴＲＡＮ０２ 程序对５ ＭＷ 核供热堆（ ＮＨＲ５） 负荷增加５０ ％ 和失去全部负荷的自跟随实验进行了分析， 其计算结果与实验结果符合得很好。并对额定工况下负荷增加３０ ％ 和失去全部负荷两种工况的安全性进行了分析， 结果表明反应堆是安全的。同时发现了自然循环冷却的反应堆在负荷变化后， 堆芯流量首先变化， 然后导致堆芯内与流量有关的参数（ 例如空泡份额） 变化， 本文给出了负荷自跟随这类瞬态过程的特征。讨论了空泡的变化规律和控制棒回水温度对自然循环流量的影响。
The RETRAN02 program with high subcooling boiling model was used to analyze the self-follow-up experiment in which the load of 5 MW nuclear reactor (NHR5) was increased by 50% and the total load was lost. The calculated results are in good agreement with the experimental results it is good. The safety of two conditions of 30% load increase and 100% load loss under rated conditions was analyzed. The results show that the reactor is safe. At the same time, it is found that after the load changes, the natural circulation cooling reactor first changes the flow rate of the core, and then leads to the change of flow-related parameters (such as void fraction) in the core. In this paper, feature. The variation law of the vacuole and the influence of control rod return temperature on the natural circulation flow were discussed.