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Vienna - Iran has announced plans to install advanced uranium enrichment machines in what would be a technological leap allowing it to significantly speed up production of material the West fears could be put to developing nuclear weapons.
In a letter to the International Atomic Energy Agency, Tehran said it would introduce new centrifuges to its main enrichment plant near Natanz, according to an IAEA communication to member states seen by Reuters.
The defiant move will increase concerns in the West and Israel about Iran's nuclear ambitions, which Tehran says are entirely peaceful, and may further complicate efforts by big powers to negotiate curbs on its enrichment programme.
Enriched uranium can fuel nuclear power plants, Iran's stated aim, or provide material for bombs if refined to a high degree, which the West suspects is Tehran's underlying purpose.
“It is certainly a provocation to increase any enrichment capacity at all,” a senior Western diplomat said.
It was not clear how many of the new centrifuges Iran planned to put in place at Natanz, which is designed for tens of thousands of machines, but the wording of the IAEA's note implied it could be up to roughly 3,000.
Analysts say U.N. sanctions have limited Iran's access abroad to special steel and other components needed to produce sophisticated enrichment machines in larger numbers.
Iran has for years been trying to develop centrifuges more efficient than the erratic 1970s IR-1 model it now has, but their introduction for full-scale production has been dogged by delays and technical hurdles, experts and diplomats say.
Iran's announcement coincides with wrangling between Tehran and six world powers over when and where to meet next, delaying a resumption of talks aimed at reaching a negotiated deal and avert a new Middle East war.
The powers - the United States, France, Germany, Britain, Russia and China - want Iran to scale back its enrichment to ensure it remains within peaceful dimensions and submit to stricter U.N. nuclear inspections.
“We along with the other U.N. Security Council members have called upon the Iranians to freeze enrichment work during negotiations,” Russian Foreign Minister Sergei Lavrov was quoted as saying by Interfax news agency on Thursday.
Western states have intensified the sanctions pressure on Iran over the past year, targeting its lifeline oil sector. This has inflicted increasing damage to Iran's economy but its clerical leadership is showing no sign of backing down.
Israel, believed to be the Middle East's only nuclear-armed state, has hinted at possible military action against Iran if sanctions and diplomacy fail to resolve the nuclear stand-off.
Iran asserts a right to enrich uranium for peaceful purposes and has repeatedly refused to halt the work, a stance underlined anew by its new centrifuge plans. Centrifuges spin at supersonic speed to increase the ratio of uranium's fissile isotope.
Iran said it would use the new model at a unit in Natanz, where it is now refining uranium to a fissile concentration of up to five percent, according to the IAEA's communication.
The IAEA “received a letter from the Atomic Energy Organization of Iran (AEOI) dated 23 January 2013 informing the Agency that 'centrifuge machines type IR2m will be used in Unit A-22' at the Fuel Enrichment Plant (FEP) at Natanz,” it said.
The IAEA said it had asked Iran, in a letter earlier this week, to provide technical and other information about the plans. A unit can house more than 3,000 centrifuges.
The Vienna-based U.N. agency, whose mission it is to prevent the spread of nuclear weapons in the world, regularly inspects Natanz and other, declared Iranian nuclear sites.
Nuclear expert Mark Fitzpatrick of the International Institute for Strategic Studies think-tank said that employing the new centrifuges at Natanz could be “a most unfortunate game changer,” depending on how many there were.
“Using the IR-2m in large numbers would enable Iran to enrich uranium much faster,” Fitzpatrick said.
Iran says it refines uranium to power a planned network of nuclear energy plants. But just one of these plants would take many years to complete, raising many questions abroad about the motivations of a major oil and gas producer speeding up its accumulation of enriched uranium and, since early 2010, refining to a level beyond the 5 percent suitable for civilian energy.
The part of Iran's enrichment work that most worries Western diplomats - to a fissile purity of 20 percent - is carried out at the Fordow underground facility near the town of Qom.
This higher level of enrichment represents a significant step closer to weapons-grade uranium. Iran says it needs 20 percent uranium to fuel a medical research reactor in Tehran.
Fordow “has increasingly been the focus of concern about Iran's capability, but a technological breakthrough at the much bigger Natanz plant might be still more provocative,” said nuclear expert Mark Hibbs of the Carnegie Endowment think-tank. - Reuters