Photo Gallery: Remembering the Chernobyl Disaster 04/25/2016
 Workers in a reactor room of the Chernobyl nuclear power plant in 1982: The...
AP

Workers in a reactor room of the Chernobyl nuclear power plant in 1982: The first of four reactors at the Ukrainian facility went online in 1977. Reactor 4, where the worst accident in the history of the peaceful use of nuclear power occurred, went online in 1983.