辅助给水系统对缓解全厂断电事故能力研究

摘要

以CPR1000核电站为研究对象,采用RELAP5/MOD3.2轻水堆瞬态分析程序,对系统进行合理简化并建模,模拟系统在全厂断电事故下的瞬态响应过程,研究全厂断电事故发生后辅助给水(AFW)的投入对缓解全厂断电事故的能力.计算结果表明:断电事故发生后,主给水丧失导致一回路压力和冷却剂平均温度在断电后6 s达到峰值;辅助给水投入约200 s后,一回路因热阱丧失而引起的温度和压力升高能有效地得到缓解,为交流电源的恢复及余热排出系统的投入赢得了更多的时间.%The transient characteristic of the simplified system for CPR1000 under the station blackout (SBO) accident was simulated by use of RELAP5/MOD3. 2 code, and the capability of mitigating accident results after auxiliary feedwater (AFW) system operating was also analyzed. The calculation results show that; As a result of the loss of the main water supply, the average temperature and the pressure of the primary system reach their maximum in 6 s after SBO accident; the increasing of temperature and pressure caused by the loss of heat sink is effectively mitigated in about 200 s after the input of auxiliary feed water, and this will win more time for the recovery of AC power and the input of residual heat removal system.