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The process began after the two sides reached an agreement three months ago that gave the agency access to several previously off-limit sites not directly linked to any suspected weapons activities.
An IAEA statement Sunday said Iran had complied with the first steps of that deal and both sides on the weekend signed off on an additional "seven practical measures." Beyond the detonator experiments, they included Iranian agreement to provide "mutually agreed relevant information" on a site where Tehran experimented with laser uranium enrichment as well as a visit to the site where such work took place.
Iranian experts abandoned the experiments years ago and opted instead to develop their centrifuge-based enrichment program. The IAEA reported in 2008 that the laser facilities had been taken over by a private company that said it had no plans to enrich uranium.
Three years later, however, then-Iranian President Mahmoud Ahmadinejad asserted that Iran still possessed uranium laser enrichment technology — a claim that the IAEA has not been able to prove or disprove.
While uranium enrichment is not directly linked to the IAEA's weapons probe, any hidden enrichment work would be a key worry for the United States and its allies. Iran says it is enriching only to make reactor fuel, but uranium enriched to weapons-grade levels is used as the payload of nuclear missiles.
Washington and five other world powers meet Feb. 18 in Vienna to work to turn the an initial agreement into a permanent pact curbing Iran's uranium enrichment in exchange for sanctions relief. Both sides say those talks are off to a promising start, but the U.S. and its allies also are looking to the IAEA-Iran meetings for additional signals from Iran's new political leadership.
Al Jazeera and wire services