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An aerial view of Ukraine's Chernobyl nucler power plant, the site of the world's worst nuclear disaster, is seen in this May 1986 file photo made a few days after the April 26 deadly explosion. In front of the chimney is the destroyed 4th reactor. Ukraine commemorates victims of Chernobyl catastrophe Thursday, April 25, 2002, on the eve of the 16th anniversary of the tragedy when a nuclear explosion, many times bigger that Hiroshima and Nagasaki combined, sent a radioactive cloud over parts of then-Soviet Ukraine, Belarus, Russia and parts of Western Europe. The plant was closed for good in 2000, but many environmental problems persist. (KEYSTONE/AP Photo/STR) ===BALCK AND WHITE ONLY===