BERLIN — The head of the U.N. atomic watchdog agency confirmed on Wednesday reports that Iran has begun operating centrifuges installed at an underground site, but said they had been moved from another facility so the country's overall uranium-enriching capabilities have not increased.
Rafael Grossi, director-general of the International Atomic Energy Agency, told reporters in Vienna that the 174 centrifuges had been moved into a new area of the Natanz nuclear site and had recently begun operating.
He said that operation of centrifuges of that type was in violation of the nuclear deal Iran had signed with world powers in 2015 — known as the Joint Comprehensive Plan of Action, or JCPOA — but would not lead to a greater overall output of enriched uranium.
Iran is already far past the deal's limits on enriched uranium, he noted.
"It is already beyond the limits of the JCPOA but in general terms there is no significant increase in the volumes," Grossi said. "So it's a nuance."
According to a confidential document distributed to member countries and seen by The Associated Press last week, Iran as of Nov. 2 had a stockpile of 2,442.9 kilograms (5,385.7 pounds) of low-enriched uranium. That is up from 2,105.4 kilograms (4,641.6 pounds) reported on Aug. 25.
The nuclear deal signed by the United States, Germany, France, Britain, China and Russia allows Iran only to keep a stockpile of 202.8 kilograms (447 pounds).
Iran has also been continuing to enrich uranium to a purity of up to 4.5%, higher than the 3.67% allowed under the deal, the IAEA has said.