Iran holds a quantity of low enriched uranium nearly 16 times higher than the limit authorized in the Joint Comprehensive Plan of Action, according to a report Monday by the International Atomic Energy Agency.
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After Washington pulled out of the nuclear deal in 2018 under former US President Donald Trump and re-imposed crippling economic sanctions against Tehran, Iran began breaching the deal's restrictions on its nuclear activities as of 2019.
One of its more recent breaches, enriching uranium to 60%, a big step towards weapons-grade from the 20% it had previously reached and the deal's 3.67% limit, continued. The IAEA estimated that Iran had produced 2.4 kg of uranium enriched to that level and 62.8 kg of uranium enriched to up to 20%.
Iran's production of experimental quantities of uranium metal, which is prohibited under the deal and has prompted protests by Western powers because of its potential use in the core of nuclear weapons, also continued. Iran produced 2.42 kg, the IAEA reported, up from 3.6 grams three months ago.
Iran has also failed to explain traces of uranium found at several undeclared sites, the report by the UN nuclear watchdog showed, possibly setting up a fresh diplomatic clash between Tehran and the West that could derail wider nuclear talks that are currently underway in Vienna.
Three months ago Britain, France and Germany scrapped a US-backed plan for the IAEA's 35-nation Board of Governors to criticize Iran for failing to fully explain the origin of the particles; the three backed off as IAEA chief Rafael Grossi announced fresh talks with Iran.
"After many months, Iran has not provided the necessary explanation for the presence of the nuclear material particles at any of the three locations where the Agency has conducted complementary accesses [inspections]," a report by Grossi to member states seen by Reuters said.
It will now be up to the three European powers to decide whether to revive their push for a resolution criticizing Iran, which could undermine the talks in Vienna. Grossi had hoped to report progress before the board meets again next week.
"The Director-General is concerned that the technical discussions between the Agency and Iran have not yielded the expected results," the report said.
"The lack of progress in clarifying the Agency's questions concerning the correctness and completeness of Iran's safeguards declarations seriously affects the ability of the Agency to provide assurance of the peaceful nature of Iran's nuclear program," it added.
In a separate quarterly report also sent to member states on Monday and seen by Reuters, the IAEA gave an indication of the damage done to Iran's production of enriched uranium by an explosion and power cut at its Natanz site last month that Tehran has blamed on Israel.
At Iran's main enrichment plant, which is underground at Natanz, the agency verified on May 24 that 20 cascades, or clusters, of different types of centrifuges, were being fed with uranium hexafluoride feedstock for enrichment. A senior diplomat said that before the explosion that figure was 35-37.
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