Regional utility Tohoku Electric Power Co Inc said an 825,000-kilowatt ( kW ) nuclear reactor , the Onagawa No.3 unit near Sendai automatically shut down due to the quake .
Japan 's Tohoku Electric Power Co Inc said an 825,000-kilowatt ( kW ) nuclear reactor , the Onagawa No.3 unit in northern Japan , automatically shut down due to the quake .