France's nuclear watchdog ASN says it has found no traces of nuclear radiation after a fire broke out at a plant containing uranium in southeastern France run by EDF unit Framatome.
"No radioactive substance was affected by the fire," the watchdog said, adding that it de-activated its emergency centre on Wednesday evening as the fire had been brought under control.
More extensive checks will be carried out by a special research team on Thursday.
A Framatome spokesman earlier said no staffer was harmed.
Framatome is a unit of French nuclear energy giant EDF.
According to the company's website, the Romans-sur-Isere site where the fire erupted produces fuel for nuclear power reactors based on enriched uranium.