Key facts
- The IAEA said it does not know the Isfahan plant's exact location, its status for safeguards purposes or whether it contains nuclear material.
- Iran has not let IAEA inspectors return to any of its nuclear facilities bombed by Israel and the United States in June 2025.
- The IAEA said Iran has not permitted inspection of the plant or access to its design plans.
- The report said the IAEA's lack of information and access is a matter of serious proliferation concern that needs to be rectified with the utmost urgency.
- The IAEA reiterated that Iran should report the status of its enrichment plants and its stock of highly enriched uranium, including material close to weapons grade.
- A senior diplomat said the plant's whereabouts and status remained unknown.
The International Atomic Energy Agency is increasingly concerned about a uranium-enrichment plant at Isfahan that Iran declared to it in June 2025 but has still not allowed the agency to inspect, according to a confidential IAEA report to member states dated November 13, 2026 and seen by Reuters.
The IAEA said it does not know the plant's exact location, its status for safeguards purposes or whether it contains nuclear material. It added that Iran has not permitted the agency to inspect the plant or see its design plans.
Iran has not let IAEA inspectors return to any of its nuclear facilities bombed by Israel and the United States in a 12-day campaign in June 2025 that destroyed or badly damaged Iran's other uranium enrichment plants, the heart of its nuclear program. The targets included a tunnel network at Isfahan where diplomats have said they believe the Isfahan Fuel Enrichment Plant is located, though a senior diplomat said its whereabouts and status remained unknown.
The IAEA had planned to inspect the plant on June 13, 2025, but the bombing campaign started that day, making it impossible. IAEA chief Rafael Grossi said in March that his agency believed a significant amount of Iran's most highly enriched uranium was in the tunnel complex at Isfahan.
While the report singled out the Isfahan plant, it also reiterated that Iran should inform the IAEA of the status of its enrichment plants and its stock of highly enriched uranium, which includes material close to weapons grade, and let inspectors return to the bombed sites and account for the enriched uranium. The report said the agency's lack of information about the material and access to facilities to verify it is a matter of serious proliferation concern and needs to be rectified with the utmost urgency.