France’s nuclear watchdog ASN on Wednesday said it had 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 in the 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 EDF.PA. 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.