Iran deal: Key details

In 2015, Iran agreed a long-term deal on its nuclear programme with the P5+1 group of world powers - the US, UK, France, China, Russia and Germany. Iran agreed to limit its sensitive nuclear activities and allow in international inspectors in return for the lifting of crippling economic sanctions. 

Here are the commitments set out in the Joint Comprehensive Plan of Action (JCPOA): Iran's uranium stockpile will be reduced by 98% to 300kg for 15 years; and Enriched uranium is used to make reactor fuel, but also nuclear weapons.

In July 2015, Iran had almost 20,000 centrifuges. Under the JCPOA, it was limited to installing no more than 5,060 of the oldest and least efficient centrifuges at Natanz until 2026 - 15 years after the deal's "implementation day" in January 2016. 

Iran's uranium stockpile was reduced by 98% to 300kg (660lbs), a figure that must not be exceeded until 2031. It must also keep the stockpile's level of enrichment at 3.67%.

No enrichment will be permitted at Fordo until 2031, and the underground facility will be converted into a nuclear, physics and technology centre. The 1,044 centrifuges at the site will produce radioisotopes for use in medicine, agriculture, industry and science.

Iran is redesigning the Arak reactor so it cannot produce any weapons-grade plutonium. Iran is required to allow International Atomic Energy Agency (IAEA) inspectors to access any site they deem suspicious. Until 2031, Iran will have 24 days to comply with any IAEA access request. If it refuses, an eight-member Joint Commission - including Iran - will rule on the issue. It can decide on punitive steps, including the reimposition of sanctions. 

A majority vote by the commission suffices. A UN ban on the import of ballistic missile technology will remain in place for up to eight years. 

Under the deal, Iran gained access to more than $100bn in assets frozen overseas, and was able to resume selling oil on international markets and using the global financial system for trade. Should Iran violate any aspect of the deal, the UN sanctions will automatically "snap back" into place for 10 years, with the possibility of a five-year extension. 

(Full details at: http://www.bbc.com/news/ world-middle-east-33521655)