Rafael Grossi, the Director-General of the International Atomic Energy Agency (IAEA), highlighted the critical danger posed by Iran's nuclear program due to a significant lack of inspection access. Speaking to ABC News on September 22, 2026, Grossi emphasized the necessity of restarting negotiations to address this escalating concern. The IAEA has not been able to adequately verify Iran's nuclear material, leading to a substantial "blind spot" in monitoring the program.
This lack of access has been a persistent issue, with Bloomberg reporting on September 12, 2026, that the "Iran Nuclear Blind Spot Deepens as IAEA Loses Access." Former U.S. Energy Secretary Ernest Moniz noted that this monitoring gap makes it increasingly difficult to determine the current status of Iran's nuclear program. This concern is particularly acute given that the IAEA previously reported in September 2025 that Iran possessed a stockpile of 440.9 kilograms (972 pounds) of uranium enriched up to 60% purity, which is considered a short technical step away from weapons-grade levels.
The IAEA's inability to verify Iran's near-weapons grade uranium stockpile extends for months, as detailed in an Associated Press report from November 12, 2025. This situation arose after Israel and the United States struck Iran's nuclear sites in June 2025. The IAEA warned that it "lost continuity of knowledge in relation to the previously declared inventories of nuclear material in Iran" at the affected facilities. Director General Grossi had previously cautioned that this stockpile could be sufficient to build as many as 10 nuclear bombs, although he stressed that it does not mean Iran currently possesses such a weapon.
Despite an agreement reached in Cairo in early September 2026 between Grossi and Iranian Foreign Minister Abbas Araghchi to resume inspections at undamaged facilities, the re-imposition of U.N. sanctions later that month led Iran to halt the implementation of this agreement. Iran's cooperation with the IAEA remains conditional on decisions by its Supreme National Security Council, and it has not granted inspectors access to sites affected by the June 2025 war. Bloomberg also reported on September 10, 2026, that the IAEA stated Iran is not cooperating with nuclear inspections and that there has been construction activity at Iran's Pickaxe Mountain, a site suspected of housing nuclear-related activities.
As of April 29, 2026, the IAEA believes it knows where Iran's buried uranium is, with Director General Grossi stating that the uranium stockpile is thought to remain buried at Isfahan. He reiterated that any future deal must include provisions for inspectors to verify Iran's claims regarding its nuclear materials. The ongoing lack of transparency and access exacerbates international concerns regarding the peaceful nature of Iran's nuclear program, which Tehran has consistently maintained despite skepticism from the IAEA and Western nations.
