The Uranium Ledger
Published 4 October 2026
Nuclear wars end up as arguments about arithmetic. How much material, where, enriched to what level, and who has counted it lately. This chapter keeps that ledger, and it keeps it with a historian's stubbornness about dates, because the most quoted number in the story is older than the war.
March and April: what satellites saw
The International Atomic Energy Agency (IAEA) published its board report GOV/2026/33 and a correction to it. The correction matters. The corrected dates on which Iran notified attacks near the Bushehr power plant are 17, 24 and 27 March and 4 April. The original report's 4 March and 27 April were errors, and anyone repeating them is repeating a typo.
The findings were specific and modest. On 3 March, IAEA satellite analysis observed damage to the entrance buildings of the Natanz enrichment plant. It did not establish further damage to the underground plant itself from that observation. Iran notified more attacks on Natanz on 12 and 21 March, and the agency observed damage to additional non-nuclear buildings.
At Bushehr the agency's analysis found a damaged structure about 350 metres from the reactor. Reuters reported on 6 April that the agency independently confirmed nearby impacts, one of them 75 metres from the site perimeter, and that the plant itself was not damaged. Those are two different reference points, the reactor and the perimeter, and they do not contradict each other. At Khondab, Iran reported a 27 March attack on the heavy water production plant, and imagery on 29 March showed severe damage. That is the production plant, not the unfinished heavy-water research reactor next to it.
June: one inspection is not a verification regime
On 8 June the agency's director general said, in his opening statement to the Board of Governors, that attacks from 28 February had stopped verification, that a regular inspection at Bushehr had resumed the week before, and that no access to other declared facilities had been established. He warned of lost continuity of knowledge over uranium held at attacked sites.
That sentence is easy to inflate. A Bushehr inspection is a power reactor under routine safeguards. It is not an inspection of enrichment halls, and it says nothing about the highly enriched stock.
What the September report could and could not say
The agency's September report, GOV/2026/50, retrieved from a third-party mirror because the agency's own index did not show it, is the most useful document in this chapter, mostly for what it admits.
- Iran's letter of 19 July reported missile attacks on the construction site at Karun, also called Darkhovin. The agency could find no sign of damage or attack there in satellite imagery, without excluding a strike nearby. This is Karun, not Bushehr.
- Iran had not confirmed access for overdue inspections at the Tehran Research Reactor and a related laboratory. It had confirmed access for planned mid-September visits to Bushehr. That is a permission, and the file holds no evidence that the visits took place.
- Seven declared facilities containing nuclear material were assessed as affected by the June 2025 attacks, as was the Khondab reactor. The location and status of a separately declared enrichment facility at Isfahan remained unknown. Thirteen declared facilities were assessed as unaffected. "Obliterated" does not describe that picture.
The number
The same report gives the agency's estimate of total enriched uranium as 9,874.9 kilograms as of 13 June 2025, including 440.9 kilograms enriched up to 60 percent. Its footnote says 432.9 kilograms of that 440.9 had been verified. Two things follow. These are masses of uranium, not counts of weapons. And the date is more than a year before this file's freeze: the agency itself says it could not verify the current size, composition or whereabouts of the stock, or whether enrichment and research had stopped.
So the honest sentence is this one. The last verified figure for 60 percent material is from June 2025, nobody outside Iran can currently say what is left or where, and any October figure quoted without that caveat is a guess dressed as a count.
Where this leaves the argument
Iran has said, through an official quoted by Reuters, that it will make no nuclear concessions. The June memorandum, covered in its own chapter, committed Iran to reaffirm that it will not develop nuclear weapons and left the fate of the stockpile to a mechanism to be agreed. The war has damaged buildings, interrupted counting and produced a great deal of confident language. It has not produced a verified inventory, and until it does, the ledger stays open.
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