The director of the Atomic Energy Organization of Iran (AEOI) said Iran might allow International Atomic Energy Agency inspectors to visit non-nuclear sites under some conditions.
However, Ali Akbar Salehi emphasized that Iran will guard its national interest and adhere to its red lines as talks continue.
He made the remarks in a recent exclusive interview with CCTV in Teheran.
The talks between Iran and the major powers to secure a settlement to Iran's nuclear issue led to an agreement on the framework of a final deal on April 2 in the Swiss city of Lausanne.
The two sides are now trying to work out the details of the deal by a self-imposed end-June deadline.
All sanctions should be lifted immediately if Iran takes all the necessary measures that are expected, Salehi said, reminding that Iran has committed itself to abiding by all its commitments and that the touchy issue is that Iran is doing things on the ground, but the other side is doing things on paper.
"So, there's a difference. So, if ever they break their promises, for us, it's difficult to revert immediately."
Under the final accord, Iran would accept some restrictions on its nuclear program, with international sanctions on the country being lifted in return.
Iranian officials have repeatedly stressed sanctions should be removed on the same day the deal is implemented, while the US wants them to be lifted gradually in a phased manner.
Immature Position
Commenting on the remarks by US Ambassador to the United Nations Samantha Powers about two weeks ago that Washington would ensure that sanctions were reapplied against Tehran, without the support of permanent UN Security Council members Russia and China, if Iran did not fully implement a final nuclear agreement, the AEOI chief said, "Whatever position is taken by either side, I think, is an immature position."
"Because it has not yet been... the discussions on these issues have not been exhausted yet. So, it's immature to speak on the snapback from our perspectives."
When asked how long it will take for Iran to implement the key steps, Salehi said it is not a very big issue and it will not take very long, adding, "We have our own evaluation, and we are in direct contact with our facilities. The other side is not in direct contact with our facilities."
"We are negotiating with the government of the United States. And, the responsibility lies with the US government. So, if they commit themselves to anything during the negotiations with us, then it is up to them to see how they can manage internally to push forward that understanding reached with us," he added.
