核电厂全厂断电事故下安全壳响应的计算分析

Analysis of Containment Response During Station Blackout

利用一体化安全分析程序研究核电厂全厂断电(SBO)事故工况下安全壳的响应。研究表明,SBO事故下安全壳会发生超压失效,如果及时恢复交流(AC)电源,安全壳内的压力和温度会迅速降低,安全壳不会发生超压失效。在压力容器失效前恢复AC电源,压力容器就有可能保持完整性。压力容器破损后,AC电源的恢复将使得安全壳内蒸汽浓度大幅减少,从而相应增加了氢气的浓度,导致氢气风险的增加。

The containment responses were analyzed by using integral safety analyses code for nuclear power plant in the case of station blackout（SBO）.It could be concluded that the containment failure would take place due to overpressure during SBO.If alternating current（AC）power recovers in time,the pressure and the temperature in the containment will decrease rapidly,and the containment failure doesn’t occur.In the case of AC power recovers before RPV rupture,the integrality of RPV might be kept. In the cases of AC power recovered after RPV rupture,the steam concentration in the containment decreases sharply,the hydrogen concentration increases accordingly,which results in the increase of the hydrogen risk.