As @laurnorman reports & Iranian officials attest, Iran has notified the IAEA of its intention to start an assembly line at Esfahan to produce uranium metal as part of advanced fuel for the Tehran Research Reactor (TRR).

It’s worth exploring Iran’s experience with u-metal, a key material that can also be used to produce nuclear weapon cores. We know that Tehran has quite a bit of experience thanks to the Nuclear Archive documents, seized by Israel in 2018. 2/

The Nuclear Archive contained info about Iran’s plans to build a pilot uranium metal production facility, called Shahid Mahallati. There, Iran would become adept at u-metal and nuke weapon component fabrication: https://t.co/kAA334GW54 3/

In 2002, Iran was also building a production-scale uranium metal & nuclear weapon components facility, Shahid Boroujerdi, in an underground tunnel complex at Parchin, the military site famous for Iran's early nuclear weapon-related high explosive work: https://t.co/0ffAKmQEAV 4/

In late-2003, under increasing international pressure, Iran halted its crash nuclear weapons program, the Amad Plan, and stopped construction on Shahid Boroujerdi & likely halted work at Shahid Mahallati. Current statuses are unknown because the IAEA has never visited. 5/