A furnace used to treat low grade nuclear waste exploded at a nuclear site in southern France...killing one person and injuring four others. France’s nuclear safety authority said there were no radioactive leaks from the explosion at the waste treatment site at Marcoule run by EDF, the operator of France’s 58 nuclear power stations...“It is a human drama, an industrial accident,” he told reporters. “There is no chemical or radioactive risk at this moment. Unfortunately there was a death, which I deplore.”...EDF said there had been no radioactive contamination outside the furnace...The accident is likely to amplify concerns over the safety of nuclear power after this year’s disaster at Fukushima in Japan.