2011 Event The 25th anniversary of the disaster in Chernobyl is commemorated by the Ukraine 2011 Event Following the Fukushima nuclear power plant disaster, Japan raises the crisis level to 7, equal to the disaster in Chernobyl 1986 Event Pravda announces high-level Chernobyl staff fired for stupidity 1986 Event Tass reports Chernobyl nuclear power plant mishap 1986 Event Chernobyl, U.S.S.R. site of world's worst nuclear power plant disaster 1986 Event Worst nuclear disaster, 4th reactor at Chernobyl U.S.S.R. explodes, 31 die
