After meeting officials from the Atomic Energy Organisation of Iran today the IAEA team will travel to Saghand uranium mine and the Ardakan yellow-cake production site, the official IRNA news agency said.
The facilities are located close together, about 450 kilometres from Tehran.
The trip is in line with a seven-step plan agreed between Iran and the IAEA in February to increase transparency over Tehran's nuclear activities.
Behrouz Kamalvandi, Iran's atomic agency spokesman, told IRNA that "most of the seven-step procedural agreement between Iran and the IAEA has been implemented."
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February's seven-step agreement is due to be completed by May 15, two days after the start of political talks in Vienna between Iran and the P5+1 - Britain, China, France, Russia and the United States, plus Germany - aimed at reaching a lasting accord.
As part of an IAEA probe, Iran agreed with the UN atomic agency in February to clarify its need "for the development of Exploding Bridge Wire (EBW) detonators".
Such fast, high-precision detonators could be used in civilian applications but are mostly known for triggering a nuclear chain reaction. The IAEA believes they form "an integral part of a programme to develop an implosion type nuclear device."
IAEA officials previously visited the Lashkar Ab'ad Laser Centre, which is said to have been used for uranium enrichment.
Aparo's delegation is due to leave Iran tomorrow night, IRNA reported.