Tokaimura criticality accident
Emergency workers at the Tokaimura accident. Source: Encyclopedia of Earth.On September 30, 1999 an accident happened at a small fuel preparation plant operated by Japan Nuclear Fuel Conversion Co. (JCO), a subsidiary of Sumitomo Metals and Mining, in the village of Tokaimura, 130 km northeast of Tokyo. The accident gave serious radiation dose to 3 employees and fatal dose to 2 of them.
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