JCO is 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. . As of 2000, stock capitalization was US$1 billion. Timeline 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 References Nuclear fuel companies Nuclear technology companies of Japan Energy companies established in 1979 Defunct energy companies of Japan Energy companies disestablished in 2003 Japanese companies established in 1979 Japanese companies disestablished in 2003