Tehran will start using fastest centrifuges on day deal takes effect
“Parameters” detailed by the US leave no doubt whatsoever, however, that the use of anything other than the most basic, first generation IR-1 centrifuges is barred for 10 years, and that even R&D on advanced centrifuges will be severely constrained.
“Iran will only enrich uranium at the Natanz facility, with only 5,060 IR-1 first-generation centrifuges for ten years,” the US parameters state. “Iran has agreed to only enrich uranium using its first generation (IR-1 models) centrifuges at Natanz for ten years, removing its more advanced centrifuges… Iran will not use its IR-2, IR-4, IR-5, IR-6, or IR-8 models to produce enriched uranium for at least ten years,” the US document adds. “For ten years, enrichment and enrichment research and development will be limited to ensure a breakout timeline of at least 1 year. Beyond 10 years, Iran will abide by its enrichment and enrichment R&D plan submitted to the IAEA, and pursuant to the JCPOA, under the Additional Protocol resulting in certain limitations on enrichment capacity.”
A French fact-sheet seen by The Times of Israel takes a similar position. It provides for Iran to gradually introduce the use of IR-2 and IR-4 centrifuges to enrich uranium after 12 years. It does not provide for the use of IR-8 centrifuges. The French fact sheet does specify that Iran will be allowed to continue R&D work on the advanced IR-4, IR-5, IR-6 and IR-8 centrifuges.