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.
利用计算机产生精确的数字信号，再将数字信号转换成模拟信号，以获得准确的反应堆周期电流信号。
An accurate digital signal is generated by computer and converted to analog, then precise reactor current signal is acquired.
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