Update on Iran’s Stocks of 3.5 Percent Low Enriched Uranium, Rev. 1

May 27, 2016

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(Revised May 27, 2016, reflecting additional data in new IAEA report on Iran)

The Joint Comprehensive Plan of Action (JCPOA) signed by the P5+1 and Iran imposes a series of restrictions on Iran’s stockpile of up to 3.67 percent low enriched uranium (LEU). One restriction imposes a cap on the amount of uranium that is allowed in Iran. The agreement allows for exemptions to this cap but these exemptions are intended to be applied to future fuel fabrication efforts. Iran may now be trying to obtain an exemption for pre-existing LEU that was expected to have been removed from the country or blended down to natural uranium by Implementation Day (January 16, 2016). The United States and its P5+1 partners should refuse to grant this exemption. One recent action is that Iran down blended 12 kilograms of up to 3.67 percent LEU to natural uranium.

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