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April 23, 2021 8:25 am
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Iran Cuts Number of Centrifuges Enriching Uranium to 60% Purity, IAEA Report Says

avatar by Reuters and Algemeiner Staff

The logo of the International Atomic Energy Agency (IAEA) is seen outside the IAEA headquarters, amid the coronavirus disease (COVID-19) outbreak in Vienna, Austria, March 1, 2021. REUTERS/Lisi Niesner

Iran has reduced the number of centrifuges enriching uranium to up to 60% purity at an above-ground plant at Natanz to one cluster from two, a report by the UN nuclear watchdog seen by Reuters indicated on Thursday.

Iran announced the shift to 60%, a big step towards weapons-grade from the 20% it had previously achieved, in response to an explosion and power cut at Natanz last week that Tehran has blamed on Israel.

Iran’s move complicated the current indirect talks with the United States on rescuing its nuclear deal with major powers. Washington pulled out and reimposed sanctions on Iran in 2018 under President Donald Trump; Iran responded as of 2019 by breaching the deal’s restrictions on its nuclear activities.

“On 21 April 2021, the Agency verified that Iran had changed the mode by which it was producing UF6 enriched up to 60% U-235 at PFEP,” the report said, referring to the above-ground Pilot Fuel Enrichment Plant at Natanz and to uranium hexafluoride, the form in which uranium is fed into centrifuges for enrichment.

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Iran was now using one cascade, or cluster, of IR-6 centrifuges to enrich to up to 60% and feeding the tails, or depleted uranium, from that process into a cascade of IR-4 machines to enrich to up to 20%, the report said. The IR-4 cascade was previously being used to enrich to up to 60%.

The International Atomic Energy Agency report did not say why Iran had made the change or say how many centrifuges are in each cascade. A previous report in February said there were 119 centrifuges in the IR-4 cascade and 133 in the IR-6 one.

The deal lets Iran produce enriched uranium but only at an underground plant at Natanz and only with first-generation IR-1 machines, which are far less efficient. It also caps the purity to which Iran can enrich uranium at 3.67%.

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