AP EXPLAINS: Iran's nuclear program as 2015 deal unravels

FILE - In this Jan. 13, 2015 file photo, released by the Iranian President's Office, President Hassan Rouhani visits the Bushehr nuclear power plant just outside of Bushehr, Iran. On Monday, June 17, 2019, Iran said it will break the uranium stockpile limit set by Tehran's nuclear deal with world powers in the next 10 days. (AP Photo/Iranian Presidency Office, Mohammad Berno, File)
FILE - In this Feb. 3, 2007 file photo, an Iranian technician works at the Uranium Conversion Facility just outside the city of Isfahan, Iran, 255 miles (410 kilometers) south of the capital Tehran. On Monday, June 17, 2019, Iran said it will break the uranium stockpile limit set by Tehran's nuclear deal with world powers in the next 10 days. (AP Photo/Vahid Salemi, File)
FILE - In this April 30, 2018 file photo, Israeli Prime Minister Benjamin Netanyahu presents material on what he described as Iranian nuclear weapons development during a press conference in Tel Aviv. Iran said Monday, June 17, 2019, it will break the uranium stockpile limit set by Tehran's nuclear deal with world powers in the next 10 days. (AP Photo/Sebastian Scheiner, File)
FILE - In this June 6, 2018 frame grab from Islamic Republic Iran Broadcasting, IRIB, state-run TV, three versions of domestically-built centrifuges are shown in a live TV program from Natanz, an Iranian uranium enrichment plant, in Iran. On Monday, June 17, 2019, Iran said it will break the uranium stockpile limit set by Tehran's nuclear deal with world powers in the next 10 days. (IRIB via AP, File)
FILE - In a Feb. 11, 2019 file photo, an Iranian woman holds an effigy of US president Donald Trump, during a rally marking the 40th anniversary of the 1979 Islamic Revolution, in Tehran, Iran. On Monday, June 17, 2019, Iran said it will break the uranium stockpile limit set by Tehran's nuclear deal with world powers in the next 10 days. (AP Photo/Ebrahim Noroozi, File)
FILE - In this May 8, 2018 file photo President Donald Trump shows a signed Presidential Memorandum after delivering a statement on the Iran nuclear deal from the Diplomatic Reception Room of the White House. Iran said Monday, June 17, 2019, it will break the uranium stockpile limit set by Tehran's nuclear deal with world powers in the next 10 days. (AP Photo/Evan Vucci, File)

DUBAI, United Arab Emirates — Iran announced it will exceed the uranium stockpile limit set by Tehran's nuclear deal with world powers in the next 10 days, further escalating tensions in the Mideast.

The June 27 deadline comes ahead of another, July 7 deadline for Europe to come up with better terms for Iran to stay in the accord. If that second deadline passes without any action, Iranian President Hassan Rouhani says the Islamic Republic likely will resume higher uranium enrichment.

Here's where Iran's unravelling nuclear program now stands.

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THE NUCLEAR DEAL

Iran struck the nuclear deal in 2015 with the United States, France, Germany, the United Kingdom, Russia and China. The deal, formally known as the Joint Comprehensive Plan of Action, grew out of secret talks President Barack Obama's administration held with Iran after Rouhani, a relative moderate, took office.

Iran agreed to limit its enrichment of uranium under the watch of U.N. inspectors in exchange for the lifting of economic sanctions. International businesses rushed to do deals with Iran, most notably the billion-dollar sales by Airbus and Boeing Co.

President Donald Trump, who campaigned on a promise of tearing up the deal because it didn't address Iran's ballistic missile program or its involvement in regional conflicts, withdrew America from the accord in May 2018. That halted promised international business deals and dealt a heavy blow to Iran's already anemic economy. In the time since, the Trump administration has said any country that imports Iranian crude will face U.S. sanctions.

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IRAN'S NUCLEAR FACILITIES

Natanz, in Iran's central Isfahan province, hosts the country's main uranium enrichment facility, located underground. Iran has one operating nuclear power plant in Bushehr, which it opened with Russia's help in 2011. Under the accord, Iran reconfigured a heavy-water reactor so it couldn't produce plutonium and agreed to convert its Fordo enrichment site — dug deep into a mountainside — into a research center. Iran said on Monday it may stop the heavy-water reactor reconfiguration. Tehran also operates an over 50-year-old research reactor in Tehran.

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IRAN'S URANIUM STOCKPILE

Under terms of the nuclear deal, Iran can keep a stockpile of no more than 300 kilograms (660 pounds) of low-enriched uranium. That's compared to the 10,000 kilograms (22,046 pounds) of higher-enriched uranium it once had. Currently, the accord limits Iran to enriching uranium to 3.67%, which can fuel a commercial nuclear power plant. Weapons-grade uranium needs to be enriched to around 90%. However, once a country enriches uranium to around 20%, scientists say the time needed to reach 90% is halved. Iran previously has enriched to 20%. Iranian officials say they've quadrupled their production of low-enriched uranium and will break the 300-kilogram limit by June 27.

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IRAN'S CENTRIFUGES

A centrifuge is a device that enriches uranium by rapidly spinning uranium hexafluoride gas. Under the atomic accord, Iran has been limited to operating 5,060 older-model IR-1 centrifuges. The IR-1 is based on a 1970s Dutch design that Pakistani scientist A.Q. Khan used to build Islamabad's nuclear weapons program and later sold to Iran, Libya and North Korea.

Iran has the technical ability to build and operate advanced versions called the IR-2M, IR-4 and IR-6 at Natanz, but is barred from doing so under the nuclear deal. Ali Akbar Salehi, the head of Iran's nuclear program, told The Associated Press in September that the IR-2M and the IR-4 can enrich uranium five times faster than an IR-1, while the IR-6 can do it 10 times faster. Western experts have suggested these centrifuges produce three to five times more enriched uranium in a year than the IR-1s.

Iran also mothballed many already-built centrifuges as part of the deal.

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FROM 'ATOMS FOR PEACE' TO STUXNET

Iran's nuclear program actually began with the help of the United States. Under its "Atoms for Peace" program, America supplied a test reactor that came online in Tehran in 1967 under the rule of Shah Mohammad Reza Pahlavi. That help ended once Iran's 1979 Islamic Revolution overthrew the shah.

In the 1990s, Iran expanded its program, including buying equipment from A.Q. Khan. Among its activities, Iran "may have received design information" for a bomb and researched explosive detonators, according to the International Atomic Energy Agency.

By August 2002, Western intelligence services and an Iranian opposition group revealed a covert nuclear site at Natanz. Iran to this day denies its nuclear program had a military dimension. Iran suspended enrichment in 2003 but resumed it three years later under hard-line President Mahmoud Ahmadinejad. World powers imposed crippling U.N. sanctions in response. The Stuxnet computer virus, widely believed to be a joint U.S.-Israeli creation, soon disrupted thousands of Iranian centrifuges.

A string of bombings, blamed on Israel, targeted a number of scientists beginning in 2010 at the height of Western concerns over Iran's program. Israel never claimed responsibility for the attacks, though Israeli officials have boasted in the past about the reach of the country's intelligence services. Israel last year said it seized records from a "secret atomic archive" in Iran.

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Follow Jon Gambrell on Twitter at www.twitter.com/jongambrellap .

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