Iran has not yet dismantled the core of a heavy water reacter at its Arak nuclear facility, news agency ISNA reports, citing the Iranian Atomic Energy Organization.
Preparations have been made, but the complete dismantling will occur as agreed upon in the nuclear deal from July 14, 2015, ISNA reported Tuesday.
Fars news agency had reported that Iran dismantled the core on Monday and encased the reactor in concrete.
The Arak facility in central Iran was one of the greatest sticking points in the nuclear negotiations between Tehran and the international community.
Bringing the reactor into service would have produced plutonium which could have been used to build an atomic bomb, prompting the international community to demand that it be converted to a more modern - and in their view safer - light water reactor.
An agreement on Arak was a deciding factor in the final report issued by the International Atomic Energy Agency (IAEA), ultimately leading to the nuclear deal on July 14, 2015, and the lifting of economic sanctions on Iran.