Changes to Iran's facilities
Natanz is Iran’s primary enrichment facility, where there are about 16,000 first-generation centrifuges. About 5,000 will remain operational.
Arak’s reactor would be redesigned so that it could not produce weapons-grade plutonium.
Fordow has almost 3,000 centrifuges, a third of which will remain. None of them can be used for uranium enrichment for at least 15 years.
The deal reduces the number of centrifuges...
Iran would reduce its number of operating centrifuges by more than two-thirds, from 19,000 to about 6,000.
...and Iran’s stockpile of uranium
Iran would reduce its stockpile of low-enriched uranium from 10,000 kilograms to 300 kilograms.