Kansai Electric Power Co (KEPCO) engineers check the readings after Unit No.4 reactor reaches maximum power at the company's Oi nuclear power plant in the town of Oi, Fukui prefecture on July 19, 2012. A second nuclear reactor has begun working in Japan, officials said on July 19, the day after its operator was ordered to examine a possible active tectonic fault directly under the plant. JAPAN OUT AFP PHOTO / JAPAN POOL via JIJI PRESS (Photo credit should read JAPAN POOL/AFP/GettyImages)
