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在 5MW低温堆的模拟试验台架 HTRL- 5上对该低温堆上空腔破口失水事故进行了实验研究。重点研究了事故后期的流动振荡现象，揭示了振荡的发展过程和发生机理。经实验研究，给出了小破口失水闪蒸过程中回路内压力、温度、空泡份额、循环流量等重要参数的变化规律，同时表明了小破口失水过程中由于压力下降引起闪蒸产生大量气泡并引起自然循环流量的变化，这些变化又反过来对各参数产生影响，使循环流量和传热情况发生周期性变化。
An experimental study on the breakwater dewatering at the cavity of the low temperature reactor was carried out on the HTRL-5 simulator test bench of 5MW low temperature reactor. Focusing on the phenomenon of flow oscillation at the late stage of an accident, the development process and mechanism of oscillation are revealed. The experimental results show the variation of pressure, temperature, void fraction, circulation flow and other important parameters of the circuit during the flashover of small-break water flashover. At the same time, the change of important parameters such as pressure drop, Steaming produces a large number of bubbles and causes a change in the natural circulation flow. These changes in turn affect each parameter and periodically change the circulation flow and the heat transfer.