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核电站的概率安全评价中,必须计算可导致堆芯熔化的事故序列的发生概率。事故序列是表示当某一初因事件发生后,可导致堆芯熔化的各种途径。如果事故序列中的各个系统是互相独立的,堆芯熔化的概率即可由各系统的成功或失效概率相乘而求出。但各系统并非都是完全独立的,因而就必须考虑系统间的相关性。例如某核电站在发生小LOCA事故后,虽高压注入系统Ⅰ成功但高压再循环系统Ⅱ失效将导致堆芯熔化。由
In the probability safety assessment of nuclear power plants, the probability of accidents that can cause the core to melt must be calculated. An accident sequence is a list of the various ways in which a core melts when a certain initial event occurs. If individual systems in an accident sequence are independent of each other, the probability of core melting can be found by multiplying the success or failure probability of each system. However, not all systems are completely independent, so it is necessary to consider the correlation between systems. For example, after a small LOCA accident at a nuclear power plant, although the high-pressure injection system I is successful, the failure of the high-pressure recirculation system II will cause the core to melt. by