JCO was a Japanese nuclear fuel cycle company established in October 1979 as a wholly owned subsidiary of Sumitomo Metal Mining Co., Ltd. as Japan Nuclear Fuel Conversion Co. 日本核燃料コンバージョン (Nihon Kakunenryō Konbājon). As of 2000, stock capitalization was 1 billion USD.
- 1979 JCO was founded
- 1980 Sumitomo Metal Mining Co., Ltd. conversion activities were handed over to JCO
- 1983 The second factory building at Tokaimura was completed
- 1998 The name was changed to just JCO
- 1999 Tokaimura nuclear accident
- 2003 Uranium conversion activities stopped completely
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