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以小破口失水事故(SBLOCA)为例,使用RELAP5和MAAP程序,计算超设计基准事故不同情况下操纵员操作时间窗口。计算结果表明:堆芯未熔化情况下,SBLOCA时执行充-排操作的时间窗口为1800 s,安全壳喷淋手动开启时间窗口为5400 s。严重事故情况下,操纵员需要对一回路卸压,针对二代改进型压水堆核电厂,避免堆芯熔化的时间窗口为300 s,避免压力容器损坏的时间窗口为3000 s。通过计算分析,给出设计扩展工况不同情况下安全设施需求及操纵员操作时间窗口。
Taking SBLOCA as an example, RELAP5 and MAAP programs were used to calculate the operator operating window under different circumstances of the design basis accident. The results show that when the core is not melted, the time window for SBLOCA to perform the charge-discharge operation is 1800 s, and the time for opening the containment spray manually is 5400 s. In case of serious accident, the operator needs to depressurize the primary circuit. For the second generation of PWR NPPs, the time window for avoiding core melting is 300 s, and the time window for avoiding pressure vessel damage is 3000 s. Through calculation and analysis, the demand for safety facilities and the operating time window of the operators under different conditions of the design extended working conditions are given.