Chernobyl disaster happened in the United States of America.
Chernobyl disaster . It occurred on 26 April 1986 in the No. 4 light water graphite moderated reactor at the Chernobyl Nuclear Power Plant near Pripyat , in what was then part of the Ukrainian Soviet Socialist Republic of the Soviet Union ( USSR ) . During the accident , blast effects caused 2 deaths within the facility and later 29 firemen and employees died in the days-to-months afterward from acute radiation syndrome , with the potential for long-term cancers still being investigated . Deaths due to the Chernobyl disaster . It occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the Ukrainian Soviet Socialist Republic , then part of the Soviet Union ) , now in Ukraine .