Iran has produced more than 120 kilograms of 20 percent enriched uranium, Iran's nuclear program chief Mohamad Eslami said, far more than the United Nations (UN) body that oversees Iran's nuclear program reported last month.
In an interview with local television, Eslami said that the signatories of the 2015 agreement were supposed to send Iran 20 percent enriched uranium for a research reactor, but that this was not done.
"If we hadn't produced it ourselves we would have had a problem," he said.
Under the terms of the nuclear deal, Iran was prohibited from enriching uranium above 3,67 percent, except for research reactor activities.
Enriched uranium above 90 percent can be used for nuclear weapons.
The International Atomic Energy Agency (IAEA) said last month that Iran's stockpile of 20 percent enriched uranium was estimated at 84,3 kilograms, up from 62,8 kilograms three months earlier.
Scientists estimate that the production of a nuclear bomb requires at least 170 kilograms of enriched uranium.
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