 As of February 2019, of the 54 nuclear reactors in Japan, there were 42 operable reactors but only 9 reactors in 5 power plants were actually operating.Though all of Japan's nuclear reactors successfully withstood shaking from the Tohoku earthquake, flooding from the ensuing tsunami caused the failure of cooling systems at the Fukushima I Nuclear Power Plant on 11 March 2011.Japan's first-ever nuclear emergency was declared, and 140,000 residents within of the plant were evacuated.