The International Atomic Energy Agency has not been able to inspect Iran’s nuclear sites since the outbreak of war in June 2025. This situation raises concerns about the status of Iran’s enriched uranium stockpile. Iran has accumulated 11 tons of enriched uranium since it began enriching uranium on an industrial scale in 2006.
Much of this highly enriched uranium is likely still at the Isfahan nuclear complex. The IAEA believes that approximately 200 kilograms of enriched uranium is stored in tunnels at this site. Additionally, Iran possesses 440.9 kilograms of uranium enriched up to 60 percent purity, which has no peaceful application.
On June 9, 2025, a truck carrying 18 blue containers, believed to contain highly enriched uranium, entered the Isfahan Nuclear Technology Center. Rafael Grossi, the IAEA Director General, stated, “We haven’t been able to inspect or to reject that the material is there and that the seals — the IAEA seals — remain there.” He added that the majority of Iran’s enriched uranium is likely at the Isfahan nuclear complex.
IAEA inspections ended when the US-Israeli war began. This conflict has left observers uncertain about the exact location of Iran’s enriched uranium stockpile. It is unclear how long it would take Iran to turn its enriched uranium into a nuclear weapon.
Grossi emphasized that what’s important is that this material either leaves Iran or is blended to reduce its enrichment levels. The potential for nuclear proliferation remains a significant concern among international observers.