Iranian officials say Inspectors from the United Nations could be allowed inside Iran's new heavy water nuclear reaction within weeks.
The spokesman for Iran's nuclear department tells the official IRNA news agency Tehran is willing to grant the U.N. International Atomic Energy Agency access to its Arak reactor before the next round of talks with the agency on December 11.
But Behrouz Kamalvandi also says details of such an inspection would still need to be worked out.
Iran and the IAEA signed an agreement that will allow expanded inspections of Iran's nuclear sites.
In Vienna, IAEA chief Yukiya Amano told the French news agency he still wants Iran to answer questions about its alleged nuclear weapons program, though the issue is not specifically outlined in the deal.
Iran insists its nuclear program has always been designed for peaceful purposes.
Meanwhile, Iran's top nuclear negotiator is back home, touting progress in the most recent round of talks with Western powers over Tehran's controversial nuclear program.
Foreign Minister Mohammad Javad Zarif sounded upbeat tone about the Geneva talks during an Iranian television talk show Monday.
"Everybody felt that considerable progress had been made. Everybody believed that there were grounds for reaching a mutual understanding and a solution, and grounds did exist. I still believe that fairly good progress was made. Let's say if we had wanted to progress by 90 percent, we did actually progress by 70 or 75 percent."
Zarif blamed the lack of a deal on divisions among the P5+1, the group that includes the United States, Britain, France, China, Russia and Germany.
U.S. Secretary of State John Kerry says Western powers were united in their proposal and that it was Iran which was not ready to accept the deal. Negotiations resume next week.
British Foreign Secretary William Hague said the P5+1 powers would lift some of the sanctions they have imposed on Iran if a preliminary deal over its nuclear program could be reached. He also said the punitive measures could be intensified if negotiations fail.
The separate deal between Iran and the IAEA deal requires Iran to give inspectors "managed access" within three months to the country's main uranium mine, access to the reactor at Arak as well as long-sought information about some of its other nuclear activities.