Bowing to intolerable sanctions and economic warfare from the US, Tehran agreed to limit uranium enrichment to only 5% (over 80% is needed to make a nuclear weapon). This low level is sufficiently only for power generation. Iran is to stop enriching to 20%, the level needed for medical isotopes.
Iran further agreed to halt construction of its Arak heavy water reactor that could eventually produce plutonium, a key nuclear weapons fuel. Tehran agreed not to build any new nuclear facilities, including next generation centrifuges, and grant daily access to UN nuclear inspectors at its top-secret Nantaz and Fordow plants. It will provide design plans for its Arak reactor.