UF6Uranium Hexafluoride (used in nuclear weapons)
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The agency stated that "Iran has not carried out activities related to reprocessing at its nuclear sites, nor has it operated any of its declared facilities for the purpose of reconverting fuel plates or scrap into UF6 and has not built any new facilities for such a purpose" The Agency confirmed that Iran's stock of LEU is in line with the nuclear accord, as is the number of centrifuges used for enrichment.
Between 5 March and 8 May 2016, the Agency verified that Iran downblended 6.1 kg of uranium in the form of UF6 enriched up to 3.67% U-235 to the level of natural uranium and, between 16 and 24 May 2016, the Agency verified that Iran downblended 5.9 kg of uranium contained in liquid and solid scrap enriched up to 3.67% U-235 to the level of natural uranium.
The gures of the UF5 and UF6 are included in this paper.
For this reason, UF6 is always handled in leak proof containers and processing equipment.
"Enriched uranium in fabricated fuel assemblies from Russia or other sources for use in Iran's nuclear reactors will not be counted against the above stated 300 kg UF6 stockpile, if the criteria set out in Annex I are met with regard to other sources."
"Developing Load Cell Monitoring on the Mock UF6 Feed and Withdrawal System." ORNL/TM-2013, no.34, 2013.
Having produced enough weapons-grade uranium hexafluoride, or UF6, for one bomb the part to take two months Iran would need to convert the UF6 to powder form, fabricate the bomb's metallic core from the powder, develop and assemble other components, and finally integrate the weapons package into a delivery vehicle - in Iran's case an IRGC-developed missile.
In pursuit of her goals Iran secretly imported 1 metric ton of uranium hexafluoride (UF6) from China but both countries did not report to IAEA about this transaction until 1991.
It was used to manufacture uranium hexafluoride (UF6) during the Cold War.
* Beginning when the line for conversion of UF6 enriched up to 5% to UO2 is ready, Iran has decided to convert to oxide UF6 newly enriched up to 5% during the 6 month period, as provided in the operational schedule of the conversion plant declared to the IAEA.
According to the Symantec researchers, this early version of Stuxnet injected attack code into Siemens 417 PLCs to manipulate the valves used to feed UF6 (uranium hexafluoride gas) into uranium enrichment centrifuges.
From this enrichment process to occur, the uranium must be in a gaseous form, and this is carried out by conversion into uranium hexafluoride (UF6), which is a gas at relatively modest temperature.