France nuclear: Marcoule site explosion kills one
There was no risk of a radioactive leak after the blast, caused by a fire near a furnace in the Centraco radioactive waste storage site, said officials.
The owner of the southern French plant, national electricity provider EDF, said it had been "an industrial accident, not a nuclear accident".
The cause of the blast was not yet known, said the company.
The explosion hit the area at 11:45 local time (09:45 GMT). A security cordon was set up as a precaution.
But interior ministry spokesman Pierre-Henry Brandet later said there had been no leak of radiation, neither inside nor outside the plant.
None of the injured workers was contaminated by radiation, said officials. The worker who died was killed by the blast and not by exposure to nuclear material.