Iran has invited the International Atomic Energy Agency (IAEA) to visit the heavy water production plant at Arak on December 8, the group's head Yukiya Amano said Thursday.
Amano told journalists that the Iranian government under President Hassan Rouhani has slowed down uranium enrichment.
By giving access to inspectors, Iran satisfies an agreement it signed on November 11 with the agency.
Iran and world powers agreed a deal on Sunday that asks the Islamic Republic to curb its nuclear program in return for a mild easing of sanctions which are taking a toll on its economy.
The agreement, temporary in nature and spanning a period of six months, requires Iran to stop enriching uranium beyond 5 percent during this period, eliminate its stock enriched beyond this level, and open its nuclear sites to broader inspection.
Amano said Iran had 196 kg of 20 percent enriched uranium, and 15,240 new generation centrifuges which are active in nuclear sites across the country.
The nuclear plant in Arak, still under construction, is one of the sticking points of the agreement. Western powers fear it may be used to produce plutonium for an atomic bomb, which Iran denies.
Iranian Foreign Minister Javad Zarif earlier said the construction would go ahead despite the deal.
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