Two senior diplomats said the transfer recently approved by the US and five other world powers that negotiated the nuclear deal with Iran foresees delivery of 116 metric tons (nearly 130 tons) of natural uranium.
UN Security Council approval is needed but a formality, considering five of those powers are permanent Security Council members, they said.
Tehran already got a similar amount of natural uranium in 2015 as part of negotiations leading up to the nuclear deal, in a swap for enriched uranium it sent to Russia. But the new shipment will be the first such consignment since the deal came into force a year ago.
The diplomats, whose main focus is Iran's nuclear program, demanded anonymity yesterday because they are not allowed to discuss the program's confidential details.
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The natural uranium agreement comes at a sensitive time. With the incoming US administration and many US lawmakers already skeptical of how effective the nuclear deal is in keeping Iran's nuclear program peaceful over the long term, they might view it as further evidence that Tehran is being given too many concessions.
The diplomats said any natural uranium transferred to Iran after the deal came into effect would be under strict surveillance by the UN's International Atomic Energy Agency for 25 years after implementation of the deal.
Without confirming the reported agreement, US officials argued that such shipments would neither endanger nor violate the Iran nuclear deal.
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