Utilite EDF insisted that the stunt today by Greenpeace had no impact on safety at the plant in Cattenom in eastern France.
The company said the activists were detained eight minutes after entering the site, and threatened legal action.
Greenpeace spokesman Yannick Rousselet said the action exposed security risks because the activists reached within 100 meters of open pools of nuclear waste. Greenpeace is lobbying for France to create special bunkers over its waste pools.
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