The report says that in the last six months, Tehran enriched 970 kilos of uranium to reactor-grade levels, bringing its publicly known stockpile of low enriched uranium to 4, 105 kilos.

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For uranium to work in a nuclear reactor it must be enriched to contain 2-3% uranium-235 while weapons-grade uranium must contain 90% or more uranium-235.

BBC: Iran installing new Natanz centrifuges, says IAEA

The idea was for Iran to ship 1, 200kg of its low-enriched uranium overseas to produce fuel for a research reactor, thus leaving the country for a while with too small a stockpile with which to make a bomb.

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Nuclear reactor fuel is enriched to 3-5% Uranium-235.

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It will be used to store and handle enriched uranium components for nuclear warheads and reactor fuel for nuclear-powered submarines.

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The prototype light-water reactor that North Korea is constructing at Yongbyon, and which requires enriched-uranium fuel, could add to the fissile material stockpile when it is completed, possibly by the end of the year.

BBC: Yongbyon restart: North Korea ramps up nuclear tension

The United States and other leading nations have been negotiating with Iran to send low-enriched uranium abroad to be turned into material for use in medical research and treatment at a reactor in Tehran.

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The Iranian government says it requires 20% enriched uranium for its medical research reactor in Tehran, but Western experts say it could be converted to weapons-grade material within six months.

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