Iran has drawn fierce criticism from Western countries by resuming its atomic fuel research.
It has removed United Nations seals from equipment at Natanz facility and plans to do the same at two other plants.
The move ends a two-year suspension of research and could result in Tehran being referred to the UN Security Council for possible sanctions.
The deputy head of Iran’s Atomic Energy Organisation, Mohammad Saeedi, has moved to ease concerns that the country planned to produce any nuclear fuel.
The United States and European Union powers warned Iran it risked referral to the U.N. Security Council for possible sanctions. Russia, Iran’s nuclear energy partner, also criticised the move.
France has also condemned Iran calling the move a “grave error” while the US and Russia have both urged Iran to stick to its committments.
Germany’s Foreign Minister Frank Walter Steinmeier says he wants the International Atomic Energy Agency to provide a rapid evaluation of Iran’s activities and what danger they pose