With the increasing need of nuclear power, almost all countries who want to build new nuclear power plant take the generation HI technology as their first choice. The main reason is that the safety of generation M technology has been improved greatly than generation II and II + technology. The passive safety technology is introduced by AP1000 and it is one of the best in generation m technologies. The representative passive containment cooling system of AP1000 and containment spray system of generation II nuclear power plant were compared in the paper and analyzed using probabilistic safety assessment method. The reasons of passive safety system possessing comparative advantages were obtained by the concrete calculation.%面对日益增长的核电发展需求,几乎所有的国家都把新的核电项目定位于第Ⅲ代核电技术,其中一个重要原因就是因为第Ⅲ代核电技术的安全性相对于第Ⅱ代和Ⅱ+核电技术的安全性有了很大提高.第Ⅲ代核电技术中的AP1000采用非能动安全技术,极大提高了安全性能指标.对AP1000与第Ⅱ代核电技术中具有代表性的安全系统,即AP1000中的非能动安全壳冷却系统(PCS)和第Ⅱ代核电中的喷淋系统(SCS),进行了比较,从概率安全评价(PSA)的角度对它们进行分析,通过具体计算得出了非能动安全系统具有比较优势的原因.
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