Many organizations were involved in the JCO criticality accident processing, accident analysis, emergency radiation monitoring, environmental and health effect evaluation and public communication.

事故发生后日本有关部门和机构对事故处理、事故分析、应急监测、事故影响评价、公众沟通等方面做了大量工作。

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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.

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。

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