Since those are five times as efficient, the time Iran would need to make a weapon would drop from a year to six months. "(Iran's) nuclear program for 15 years", Moniz said.
Still the easing of restrictions on the number and kind of centrifuges means that once the deal expires, Tehran will be positioned to quickly make enough highly enriched uranium to bring up its stockpile to a level that would allow it to make a bomb in half a year, should it choose to do so.
On Thursday, the first anniversary of the signing of the deal, US Secretary of State John Kerry said the deal has made the world safer despite naysayers' predictions as he marked the agreement's one-year anniversary.
The document also notes that Iran will greatly expand its work with centrifuges that are even more advanced, including large-scale testing in preparation for the deal's expiry 15 years after its implementation on January 18.
"This is what Chancellor [Angela] Merkel and German intelligence services were discussing in part a couple weeks ago when they said that Iran is violating the nuclear deal and the associated U.N. Security Council resolutions", Cotton said. However, details were foggy on what would happen when the stipulations of the deal expire, which varies from 10 to 15 years.
Iran's foreign minister on Tuesday defended a nuclear deal provision that allows Tehran to begin ramping up its nuclear program after 10 years, a day after the secret document was revealed, leading to concerns over the effectiveness of the landmark nuclear deal.
But State Department spokesman Mark Toner said that "the prohibition on Iran's pursuit of a nuclear weapon - and our ability to monitor the peaceful nature of its nuclear program - remains in effect indefinitely".
The bigger nuclear deal provides Iran with sanctions relief in exchange for its nuclear constraints.
IAEA members voting to "close the file" on the Iranian nuclear weapons program, even though Iran failed to cooperate with an investigation that found its nuclear weapons work hadcontinued at least until 2009. The IAEA said Tehran has essentially kept to its commitments since the agreement was implemented, a little more than six months after Iran and the six powers finalized it on July 14, 2015.
Netanyahu stressed that Israel "will not accept a nuclear weapon in Iran's hands", adding that it will also not allow Iran to open up additional fronts against Israel, such as on the Golan Heights.
Critics of the Iran deal at the time of its signing pointed out that the terms of the deal would allow for Iran to resume its nuclear program after a decade. The contents of the document were confirmed by a second diplomat in possession of the same part of the agreement, AP says.
Associated Press writer Matthew Lee contributed from Washington.