IAEA, Iran agree visit at disputed reactor site

But Western powers fear that Tehran wants to use plutonium, a byproduct of production at the Arak heavy-water reactor, for the core of nuclear warheads.

Iran's envoy to the IAEA, Ali Asghar Soltanieh, confirmed inspections would take place at Arak while adding that Iran saw completion of the reactor as its undeniable right, Iran's official IRNA news agency said.

Last year the IAEA's governing board rejected Iran's request for technical aid for Arak. In April, Iran stopped providing advanced design information on planned nuclear sites like Arak.

The U.N. Security Council has imposed two rounds of sanctions since December on Iran for failing to halt enrichment, a process which can produce fuel for power plants or material for warheads. A third sanctions resolution is being considered.