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On this day, the Fukushima Daiichi nuclear power plant was commissioned.
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On 30 October 1991 one of two backup generators of reactor nr. 1 did fail, after it was flooded in the basement of the reactor buildings. Seawater used for the cooling of the reactor was leaking into the turbine-building from a corroded pipe at a rate of 20 cubic meters per hour. This was told by former TEPCO employees to the Japan Broadcasting Corporation news-service in December 2011.
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The tsunami broke the reactors' connection to the power grid and also resulted in flooding of the rooms containing the emergency generators. Consequently those generators ceased working and the pumps that circulate coolant water in the reactor ceased to work, causing the reactors to begin to overheat. The flooding and earthquake damage hindered external assistance.
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The Japanese authorities declared the 20 km evacuation zone a no-go area which may only be entered under government supervision.
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A TEPCO spokesman mentioned that TEPCO would have been better prepared to cope with tsunami in March 2011, if it had taken the 2008-study more seriously.
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