Ukraıne Chernobyl Nuclear Accıdent Annıversary

epa02124305 A worker sweeps a parking lot in front of the shelter of fourth energy block at Chernobyl ' s Nuclear Power Plant , Ukraine , 19 April 2010 . One of two reactors at the Chernobyl nuclear power station exploded in a power test in 1986 . The Pripyat city population of 47 , 000 was evacuated after the explosion . Ukrainians will mark the 24th anniversary of the world ' s worst nuclear power accident on 26 April .  EPA/SERGEY DOLZHENKO