自然循环部分冷却驱动压头丧失下的环路流量特性研究

Research on Loop Flow Characteristics after Losing Partial Cooling-Driven Head under Natural Circulation Condition

在SG二次侧排热减小类事故工况下,若反应堆初始以自然循环状态运行,当破损SG二次侧排热丧失时,受影响环路流量可能完全丧失,对事故缓解及核电厂安全带来不利。本文对上述工况下的环路自然循环特性进行了研究,通过理论分析得到了不同环路自然循环流量的特性及主要影响因素,并通过模拟计算得到了不同冷却速率工况下环路自然循环流量数据,最后对核电厂制定相关应对措施方面提出了建议。

If the decrease in heat removal by SG secondary sid~ accident occur at the time when the plant is operated at natural circulation condition, the flowrate of the affected loop may be totally lost when losing of the ability that heat removed by secondary side of the broken SG, which will bring disadvantages to the accident mitigation and the plant safety.. In present work, the natural circulation characteristics under the condition mentioned above was studied and the disciplinarian and the main impacting factors of the flow evolution of both affected and unaffected loop was gained theoretically. Some calculations had been performed, which given the loop flowrate data for different cooling velocities. Finally, some proposals about the responses should be taken by the plant under such situation was given.