(VOVworld) - Iran denied on Friday that it had in any way breached its nuclear deal with world powers, insisting it was meeting its commitment to cap its stocks of controlled materials.

A report by the International Atomic Energy Agency last week showed that Iran's stocks of so-called heavy water had inched above the 130-tonne level set out in the agreement. Heavy water is not itself radioactive but is used in certain types of nuclear reactor, which can in turn produce plutonium that can be used in an atomic bomb. The July 2015 deal with world powers sets Iran's heavy water "needs" at 130 tonnes and states that any excess must be "made available for export". IAEA chief Yukiya Amano had chided Iran on Thursday for exceeding the agreed limit on its stockpiles for a second time.