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IAEA Chief Says Iran's Highly Enriched Uranium Likely Still Buried at Isfahan Site
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IAEA Chief Says Iran's Highly Enriched Uranium Likely Still Buried at Isfahan Site

Apr 29, 2026

IAEA Director General Rafael Grossi stated in April 2026 that most of Iran's highly enriched uranium stockpile—including roughly 200 kilograms of the country's total 440.9 kilograms enriched to 60 percent purity—likely remains stored in tunnels at the Isfahan nuclear complex, though inspectors have been unable to verify this since June 2025. The IAEA lost inspection access when a 12-day US-Israeli war began in June 2025, during which the United States bombed three Iranian nuclear sites and Isfahan faced airstrikes, though a newly declared enrichment facility there was apparently not hit. Iran's uranium stockpile could produce as many as 10 nuclear bombs if weaponized, representing exponential progress since the 2015 nuclear deal that Trump abandoned in 2018. As of April 2026, Iran proposes ending its Strait of Hormuz blockade in exchange for sanctions relief while postponing nuclear discussions, but Trump rejects this approach, with Secretary of State Marco Rubio demanding any deal definitively prevent Iran from developing nuclear weapons capability.

Location and Status of Iran's Highly Enriched Uranium Stockpile

  • ▪The Isfahan nuclear complex faced attacks in the 2026 US-Israeli war
  • ▪The International Atomic Energy Agency believes a large percentage of Iran's highly enriched uranium was stored at Isfahan in June 2025 when a 12-day war broke out
  • ▪The Isfahan nuclear complex was bombarded by airstrikes in 2025
  • ▪Airbus satellite images show a truck loaded with 18 blue containers going into a tunnel at the Isfahan Nuclear Technology Center on June 9, 2025

IAEA Inspection Access and Monitoring Challenges

  • ▪The International Atomic Energy Agency has not been able to inspect or verify that nuclear material remains at Isfahan since June 2025
  • ▪International Atomic Energy Agency inspectors were scheduled to visit Iran's new Isfahan enrichment facility the day airstrikes began in June 2025
  • ▪International Atomic Energy Agency inspections ended at Isfahan when Israel launched a 12-day war in June 2025
  • ▪The United States bombed three Iranian nuclear sites during the June 2025 12-day war

Diplomatic Negotiations and Obstacles to a Nuclear Deal

  • ▪The International Atomic Energy Agency has not been part of recent ceasefire negotiations mediated by Pakistan as of April 2026
  • ▪Russian President Vladimir Putin renewed his offer to help the United States handle Iran's enriched uranium in April 2026
  • ▪The International Atomic Energy Agency participated in US-Iran nuclear talks in February 2026
  • ▪Donald Trump pulled the United States out of the 2015 Iran nuclear agreement in 2018
  • ▪Donald Trump is rejecting Iran's latest proposal as of April 2026

Perspective of International Atomic Energy Agency

  • ▪The International Atomic Energy Agency assesses that most of Iran's highly enriched uranium stockpile remains likely stored at the Isfahan nuclear complex as of April 2026
  • ▪The International Atomic Energy Agency relies on satellite imagery to monitor Iranian nuclear sites since losing direct inspection access in June 2025

Perspective of United States under Donald Trump

  • ▪Donald Trump is rejecting Iran's latest April 2026 proposal that would postpone nuclear program discussions

Perspective of Russia

  • ▪Russian President Vladimir Putin renewed his offer to help the United States handle Iran's enriched uranium in April 2026

3 sources

Apnews
Iran’s highly enriched uranium likely is still at the Isfahan site, UN nuclear chief tells AP
View source article
Independent
Iran has enough enriched uranium for ten nuclear bomb: UN
View source article
Timesofisrael
UN nuclear chief: Much of Iran’s highly enriched uranium likely still buried at Isfahan site
View source article

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Related entities

Isfahan nuclear complexIsfahanIranInternational Atomic Energy Agency

People Involved

Rafael Mariano Grossi

Topics

Enrichment & deal frameworksIran & regional influenceArms control & disarmamentNuclear energyIran WarIran's nuclear program