Iran enriches uranium to 20% with new centrifuges at fortified site

The IAEA reported last month that Iran has 43 kilograms of uranium enriched to 60% purity — a short step to weapons-grade level of 90%.

Iran announced on Sunday that it has begun enriching uranium up to 20% using sophisticated centrifuges at its underground Fordo nuclear plant, state TV reported, an escalation that comes amid a standoff with the West over its tattered atomic deal.

That Tehran is enriching uranium up to 20% purity — a technical step from weapons-grade levels of 90% — with a new set of its most advanced centrifuges at a facility deep inside a mountain deals yet another blow to the already slim chances of reviving the accord.

Behrouz Kamalvandi, a spokesman for Iran’s Atomic Energy Organization, said uranium enriched to 20% was collected for the first time from advanced IR-6 centrifuges on Saturday. He said Iran had informed the U.N. nuclear watchdog about the development two weeks ago.

Centrifuges are used to spin enriched uranium into higher levels of purity. Tehran’s 2015 nuclear agreement with world powers had called for Fordo to become a research-and-development facility and restricted centrifuges there to non-nuclear uses.

Iran had previously told the IAEA that it was preparing to enrich uranium through a new cascade of 166 advanced IR-6 centrifuges at its underground Fordo facility. But it hadn’t revealed the level at which the cascade would be enriching.

The International Atomic Energy Agency, the U.N.’s nuclear watchdog, told The Associated Press that it had verified on Saturday that Iran was using a set-up that allowed it to more swiftly and easily switch between enrichment levels.

In a report to member states, Director General Rafael Grossi described a system of “modified sub-headers," which he said allowed Iran to inject gas enriched up to 5% purity into a cascade of 166 IR-6 centrifuges for the purpose of producing uranium enriched up to 20% purity.