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为验证三代核电AP1000核电厂在非LOCA事故工况下,启动给水补给性能是否满足衰变热排出的纵深防御准则,保守认为事故发生后,反应堆停堆,厂用电及外电网丧失,主给水丧失,凝汽器热阱丧失,蒸汽发生器背压为安全阀最低整定压力,蒸汽发生器与启动给水泵均为单列可用。首先,验证凝结水储箱处于最低液位时,启动给水的最低补给能力能否满足不小于118.1 m3/h的准则要求;其次,论证事故后由于备用交流电源加载滞后而导致启动给水延后140 s投运,蒸汽发生器依靠自身缓冲水装量能否带走衰变热而不触发专设安全系统;再次,论证140 s后启动给水最低补给流量,能否稳定蒸汽发生器液位并使其回升;最后,验证凝结水储箱纵深防御水装量能否满足启动给水24 h连续补给的准则要求。本文通过对启动给水最低补给流量、蒸汽发生器缓冲水装量、启动给水液位控制,以及凝结水储箱水装量的保守计算分析,验证了AP1000启动给水在非失水事故(Non-LOCA)事故下衰变热排出功能设计的可靠性以及与纵深防御准则的一致性。
In order to verify the deep-sea defensive criteria that the third generation nuclear power AP1000 nuclear power plant started to meet the requirement of decay heat discharge under non-LOCA accident conditions, it is conservatively believed that after the accident, reactor shutdown, loss of plant electricity and external power grid, loss of main feed water , The condenser heat sink is lost, the steam generator back pressure is the lowest setting pressure of the safety valve, and both the steam generator and the starting feed water pump are available separately. First of all, to verify whether the minimum recharge capacity of start-up water supply can meet the criterion of not less than 118.1 m3 / h when the condensate water storage tank is at the lowest level; secondly, to delay the start-up water supply after the accident due to the lag of backup AC power supply s put into operation, the steam generator depends on its own buffer water loading can take away decay heat without triggering a dedicated safety system; Third, after 140 s to start the minimum supply flow of water supply, the steam generator can stabilize the level and make it Finally, verify whether the depth of the condensed water tank defensive water load can meet the 24 h continuous start-up water supply guidelines. This paper verifies the AP1000 start-up water supply non-loss accident (Non-LOCA) by starting the minimum supply flow of feed water, the buffer water load of steam generator, the control of start feed water level and the conservative calculation of water load of condensed water tank ) The reliability of decay heat dissipation features under accident and compliance with defense-in-depth guidelines.