article_snippet.sent: Energy Secretary Ernest Moniz said a final agreement would in some ways be tougher than what the U.S. the U.S. has outlined thus far.
article_snippet.sent: At a breakfast meeting with journalists, Moniz, a former MIT physics department head, provided some new detail on the combination of technical limits that the U.S. says would keep Iran at least a year away from assembling enough fissile material for one nuclear weapon for at least a decade.
article_snippet.sent: Hours after the framework was announced, the U.S. the U.S. said Iran would be permitted to keep 6,104 centrifuges installed.
article_snippet.sent: Of 6,104 centrifuges installed, a little more than 1,000 could be kept at Iran's deeply buried facility at Fordo that may be impervious to the U.S. or Israeli air attack.
article_snippet.sent: Moniz said no advanced centrifuges can be installed or developed at that site for 15 years.
article_snippet.sent: And in a new twist, Moniz said only one-third of the 1,000 centrifuges there can actually 'spin' over that period.
article_snippet.sent: The rest will be 'just sitting there,' Moniz said.