稳压器安全阀在核电厂严重事故中的有效性分析

我国在役的M310型核电机组采用稳压器安全阀(SRV/PORV)的卸压功能延伸来完成严重事故下的卸压,避免高压堆芯熔融物喷射。由于SRV/PORV的结构特性,先导箱、电磁驱动装置在严重事故工况下的存在失效风险,且现场可靠电源的时效性不可控。文章基于上述技术障碍,对稳压器安全阀在严重事故下的有效性进行了分析,结果表明,采用国际上新型电磁驱动装置进行技术改进,可提高现有M310型核电机组应对严重事故的可用性及有效性,从而提高核电站应对严重事故的能力。

M310 nuclear power units in service in China use the extension of pressure relief function of SRV/PORV to complete the pressure relief under severe accidents,and avoid the injection of high-pressure core melt.Due to the structural characteristics of SRV/PORV,the pilot cabinet and solenoid device are at risk of failure under severe accident conditions,and the timeliness of reliable power supply on site is uncontrollable.In this paper,based on the above technical obstacles,the effectiveness of the pressurizer safety valve in severe accidents is analyzed.The results show that the availability and effectiveness of M310 in dealing with severe accidents can be improved by adopting the new solenoid service,thus improving the ability of nuclear power plants to deal with severe accidents.