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在模块化小型反应堆非能动安全系统综合模拟实验装置上进行波动管小破口尺寸失水事故实验,研究波动管小破口失水事故过程中的热工水力现象和非能动安全系统运行特性。模块化小型反应堆发生失水事故后,压力平衡管和安注管线内流体的密度差可以驱动堆芯补水箱(CMT)内的冷流体注入反应堆压力容器,压力平衡管裸露后CMT安注流量出现波动;安注箱(ACC)的安注对事故初期的堆芯冷却效果显著;经自动卸压系统卸压后,内置换料水箱(IRWST)可以对堆芯进行持续稳定的安注和冷却。研究结果表明:波动管小破口失水事故中,非能动安注系统可以对堆芯进行有效注水,并带走堆芯衰变热量。
The experiments on the small breakwater size loss of wave tubes were carried out on the integrated simulation experimental device of modular passive reactor safety system, and the thermal-hydraulic phenomena and the operating characteristics of the passive safety system during the small-breakwater loss accident of the wave tubes were studied. After the occurrence of water loss accident in a modular small reactor, the density difference of the fluid in the pressure balance pipe and the safety injection line can drive the cold fluid in the core fill water tank (CMT) to be injected into the reactor pressure vessel, and the CMT safety injection flow appears after the pressure balance pipe is exposed (ACC) can significantly reduce the core cooling effect at the initial stage of the accident. After depressurization by the automatic pressure relief system, the built-in refueling water tank (IRWST) can provide a steady and stable core injection and cooling. The results show that in the event of a small breakwater wicket of a fluctuating tube, the passive anactive gas injection system can effectively inject water into the core and take away the core decay heat.