严重事故下安全壳内环境条件计算分析

Computational Analysis of Environment Condition Inside Containment under Severe Accident

参照对先进压水堆安全壳的要求,结合恰希玛二期工程严重事故缓解措施,对大破口失水事故(LLOCA)叠加安注失效、小破口失水事故(SLOCA)叠加安注失效、全厂断电(SBO)叠加柴油机驱动的辅助给水失效等严重事故序列可能影响安全壳内环境的条件及缓解措施进行了分析。结果表明,恢复喷淋可以明显地降低安全壳内的压力和温度,有效地改善安全壳内的环境,从而改善各种仪表设备的工作条件。

Considering the detail requirements of evolutionary and advanced light-water reactor design and taking the mitigation measures for severe accidents in Chashma Nuclear Power Plant(NPP) Unit-2 as an example,this paper analyzed the severe accident sequences affecting the environment conditions inside con-tainment such as the large LOCA with safety injection failure,small LOCA with safety injection failure and Station Blackout with AFW failure,and its mitigation measures..The results show that the containment pressure and temperature are decreased obviously after the containment spray is recovered.As a result,the environment condition inside containment comes to available for the equipment.