Onagawa Nuclear Power Plant

The Onagawa Nuclear Power Plant (Onagawa genshiryoku hatsudensho, Onagawa NPP) is a nuclear power plant located on a 1,730,000 m2 (432 acres) site in Onagawa in the Oshika District and Ishinomaki city, Miyagi Prefecture, Japan. It is managed by the Tohoku Electric Power Company. It was the most quickly constructed nuclear power plant in the world. All the reactors were constructed by Toshiba. The Onagawa-3 unit was used as a prototype for the Higashidori Nuclear Power Plant. The plant had been shut down after the 2011 Tōhoku earthquake and tsunami. The Onagawa nuclear power plant was the closest nuclear power plant to the epicenter, and facing the Pacific Ocean on Japan's north-east coast, experienced very high levels of ground shaking – among the strongest of any plant affected by the earthquake – and some flooding from the tsunami that followed. All three reactors at the power plant successfully withstood the earthquake and tsunami without accident. Following an IAEA inspection in 2012, the agency stated that "The structural elements of the NPS (nuclear power station) were remarkably undamaged given the magnitude of ground motion experienced and the duration and size of this great earthquake". More recently, Tohoku Electric reported that the third floor of No. 2 reactor building lost about 70% of its structural rigidity and the first floors lost 25%, compared to when they w

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