非能动余热排出系统长期冷却特性实验研究

Experimental Study on Long-Time Cooling Characteristics of Passive Residual Heat Removal System

为了获取ACP100非能动余热排出系统(PRS)长期运行特性,在切除全部堆芯功率这一极限工况下,开展长期冷却特性实验研究。研究发现:在反应堆本体、堆芯及蒸汽发生器储热释放影响下,PRS维持着0.52~0.26 t/h的自然循环流量,系统压力由1.0 MPa持续下降至0.51 MPa,温度堆芯出口温度由178.1℃持续下降至105.0℃;这表明堆芯及系统余热能够安全地排出,ACP100 PRS中的自然循环只会持续地衰减,不会发生停滞后再启动现象。

An experimental investigation on longtime cooling is carried out in a removal of all core power condition for understanding the running characteristics of ACP 100 passive residual heat removal system（PRS）. The investigation finds a continuance of natural circulation, which is due to stored heat releasing from reactor, core and steam generator. The natural circuit flow of PRS keeps from 0.52 t/h to 0.26 t/h; meanwhile, the system pressure of PRS falls from 1.0 MPa to 0.51 MPa, and the outlet temperature of the reactor core falls from 178.1℃ to 105.0 ℃. Besides, the investigation shows that natural circulation is descending continuously, and never restarts after stagnation.