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An explosion and subsequent fire damaged a transformer of the first power unit at France’s Tricastin nuclear power plant. No injured or dead have been reported.
The fire was put out in a matter of 20 minutes. No damage to the environment has been recorded.

Power unit 1 of the Tricastin plant was not in operation at the time of the explosion.

http://english.ruvr.ru/2011/07/03/52705263.html