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.
Iran's government has said it needs the purer form of enriched uranium to fuel its research reactor in Tehran.
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.
It will be used to store and handle enriched uranium components for nuclear warheads and reactor fuel for nuclear-powered submarines.
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.
Iran had enriched uranium to the low grades required for reactor fuel. 10.28.49 President Ahmadinejad Voice over I am officially announcing that Iran has joined the group of those countries which have nuclear technology.
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.
U.S. and United Nations officials have documented what they describe as serious limitations in Iran's ability to quickly and efficiently produce the enriched uranium required to either fuel a nuclear power reactor or to build an atomic weapon.
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Nuclear reactor fuel is enriched to 3-5% Uranium-235.
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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.
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.
It was also now fuelling the Tehran Research Reactor used to make medical isotopes with its own domestically produced uranium enriched to 20%.
Iran's stock of low-enriched uranium is bigger: only about half of it would be needed to produce the equivalent fuel load for the medical reactor.
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