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 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 said the agreement represents a good start.
"We have agreed to further cooperate with respect to the verification to be undertaken by the IAEA to resolve all present and past issues," said Amano.
Amano also said 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 about the Geneva talks during an Iranian television talk show Monday.
"Everybody [in Geneva] 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," said Zarif.
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.
On Tuesday, U.S. State Department spokeswoman Jen Psaki said the key point is that negotiations are going to resume next week.
"Fault is immaterial. They didn't agree to an agreement. They're going to come back next week and continue the discussions and continue the negotiations. We've narrowed the gaps. There are still issues that remain. And that's where things stand," said Psaki.
US lawmakers skeptical
Despite optimism that there is a chance for the negotiations to produce a deal acceptable to all sides, some U.S. lawmakers are calling for new sanctions against Iran.
In an opinion piece Tuesday in USA Today, Senate Foreign Relations Committee chairman Bob Menendez wrote, "Tougher sanctions will serve as an incentive for Iran to verifiably dismantle its nuclear weapons program. When Iran complies, sanctions can be unwound and economic relief will follow."
Secretary Kerry has been in touch with lawmakers since the talks in Geneva began and is scheduled to brief the Senate banking committee Wednesday. Psaki said his message on sanctions has been consistent.
"The right step is to put a temporary pause on sanctions. It doesn't mean we can't put them in place in the future. They're (the U.S. negotiators) not eliminating that. This is simply a pause to see if this negotiating process can work its way through," said Psaki.
British Foreign Secretary William Hague has 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.