如果是复杂模型，例如一张显示着将进入临界状态的核反应堆的图表，则做出如何防止熔炉的决策会很复杂。
If the model is complex-perhaps a diagram showing a nuclear reactor going critical-the decisions on how to prevent a meltdown will be complex.
日本在1999年就曾发生过一次4级核事故（又称“东海村核事故”——译注），当时在日本核燃料转换公司（Japan Nuclear Fuel Conversion）的一个燃料厂内，三名正在为反应堆准备燃料的工人引发了一次链式核反应，使反应堆达到临界状态。
Japan itself had a Level 4 accident in 1999, when three workers preparing fuel for a reactor at a Japan Nuclear Fuel Conversion plant triggered a nuclear chain reaction, called a criticality.
该核反应堆模块还包括一个或多个加热器，这些加热器被配置为在启动操作期间和在反应堆芯变成临界状态之前向冷却剂添加热。
The nuclear reactor module further includes one or more heaters configured to add heat to the coolant during a startup operation and prior to the reactor core going critical.
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