Iran said Tuesday it will allow International Atomic Energy Agency inspectors to visit the Parchin military complex near Tehran.
The UN nuclear watchdog will be granted access to the suspected nuclear site at a time to be announced, the semi-official ISNA news agency reported Tuesday.
Iran's permanent envoy to the IAEA said Tuesday the move was a gesture of goodwill.
The visit will not be allowed, however, until an agreement is reached on inspection guidelines, according to the ISNA.
It is believed that Parchin is home to a large chamber designed for testing the high-explosives necessary to detonate the core of a nuclear warhead.
The IAEA noted the potential test chamber on recent satellite photos requested to visit the site last month during talks in Tehran, but the request was denied.
The nuclear watchdog last visited the site in 2005, but did not look in the area where the explosives chamber is believed to be located.
The site could be a potential target in a possible Israeli attack on Iranian nuclear sites.
US President Barak Obama met Monday with Israeli Prime Minister Benjamin Netanyahu where Iran's nuclear program was at the top of their agenda.
Also Monday, the five permanent members of the UN Security Council plus Germany announced they would resume nuclear talks with Iran.