The activists snuck into the grounds of the Tricastin plant in the southern Drome region around 5:00 am, Greenpeace and local police said.
They hung banners reading "Tricastin: a nuclear accident" and "Francois Hollande: president of a catastrophe?" in reference to the French leader, according to Isabelle Philippe, a Greenpeace spokeswoman.
Police confirmed the break-in, but did not give any additional information.
Plant officials were not immediately available for comment.
Activists from the environmental anti-nuclear group have staged several break-ins in French nuclear plants in recent years in an effort to highlight what they say are dangers of atomic power and to expose security problems at the power stations.
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