An oven exploded Monday at a nuclear site in France, killing one person and injuring four others, a spokeswoman for French energy company EDF said.
There was no radioactive leak or waste released, she said. The Ministry of the Interior and the French nuclear safety agency also said there had been no radioactive leak, CNN affiliate BFM-TV reported.
The explosion took place in Marcoule, in southeastern France, the EDF spokeswoman said, declining to give her name in line with company policy.
Weapons-grade plutonium is produced at the plant, the think tank Global Security said. EDF did not immediately confirm that.
France relies heavily on nuclear power, which now accounts for about 80% of the country's electricity production, according to the U.S. State Department.
The French government has been reviewing the country's dependence on nuclear energy in the wake of the Fukushima nuclear disaster in Japan in March, which was triggered by an earthquake and tsunami.
There have been no serious suggestions from mainstream politicians that France reduce its dependence on nuclear power, the State Department said.Read CNN's full coverage of the explosion at a French nuclear site