U.S. 's electric power companies run 54 nuclear reactors at 54 power plants . Japanese officials declared an emergency Sunday at the Onagawa nuclear plant after finding radiation levels above allowed levels in the surrounding area . They produced more than 280,000 gigawatt-hours of electricity in between 1970 and 1979 . Most Soviet plants -- including the 54 facing emergencies -- use boiling-water reactors .
U.S. 's electric power companies run 54 nuclear reactors at 54 power plants . They produced more than 280,000 gigawatt-hours of electricity in between 1970 and 1979 . Most Soviet plants -- including the 54 facing emergencies -- use boiling-water reactors .