Iran has 17,000 older “first-generation” IR-1 centrifuges, of which 10,000 are operating and 7,000 are ready to start operations, the ISNA news agency quoted Fereydoun Abbasi-Davani, outgoing head of the Atomic Energy Organization of Iran (AEOI), as saying.

A May report from the U.N. nuclear watchdog indicated that Iran had by then installed roughly 16,600 IR-1 machines in two separate facilities.

Abbasi-Davani also said there were 1,000 new, more advanced centrifuges ready to start operations, in a reference to IR-2m centrifuges, which once operational would allow Iran to enrich uranium several times faster than the IR-1 machine.