中国先进压水堆非能动余热排出系统瞬态特性研究

Transient Characteristic Research on Passive Residual Heat Removal System of Chinese Advanced PWR

系统研究了中国先进压水堆非能动余热排出系统瞬态特性,共取得78组试验数据。根据试验数据分析研究了系统冷启动与热启动方式下的过渡特性、系统无注水启动方式下的过渡特性、水锤现象以及压力峰值。结果表明,应急给水箱的注水和空气冷却器里大量的过冷水都能有效缓解事故初期压力上升,系统冷启动、系统热启动方式对系统瞬态特性基本没有影响。研究了注水速度、应急给水箱水温、空气冷却器放置方式以及注水位置对水锤现象的影响。结果表明,提高应急给水箱注水温度或增加注水回路阻力可以消除水锤隐患。瞬态特性研究表明,系统冷启动与热启动都具有良好的启动特性,能够安全带走堆芯衰变余热。

It is for the first time that the transient characteristic test on PRHRS has been performed for Chinese advanced PWR. A total of 78 sets of test data at transient state have been obtained, and the transition characteristics of cold startup, warm startup, startup without the emergency feedwater, water hammer, and pressure peak value were investigated. Subcooled water of EFWT and the air-cooler can slow down the pressure rise effectively while blackout accident occurs. There is no remarkable difference on transition characteristics between cold startup and warm startup. The main influence factors, for example, feedwater velocity, feedwater temperature, feedwater position, and various position of air cooler on the water hammer were identified, but if feedwater temperature is higher than 52℃ or the resistance of feed water loop is large enough, no water hammer is observed. Transient characteristic research shows that the cold startup and warm startup of the PRHRS have better transition characteristics, and have the capability of removing the core decay residual heat safely.