FILE- In this file photo taken on Sunday, Aug. 22, 2004, staff members, enter Tehran's nuclear research reactor at the Iran's Atomic Energy Organization's headquarters, in Tehran, Iran.

 

              FILE- In this file photo taken on Sunday, Aug. 22, 2004, staff members, enter Tehran
FILE- In this file photo taken on Sunday, Aug. 22, 2004, staff members, enter Tehran's nuclear research reactor at the Iran's Atomic Energy Organization's headquarters, in Tehran, Iran. In a bid by Iran to ease international concerns over its nuclear program, more than a third of Tehran's most highly enriched uranium has been converted into a powder that is used to run a research reactor but difficult to reprocess for possible weapons production, experts and U.N. monitors say. The work _ noted in a technical report by the U.N.'s nuclear watchdog agency in late August _ suggests a two-prong effort by Iran: Trying to display goodwill to restart nuclear talks with world powers while seeking to soften demands by the U.S. and others to halt Tehran's top-level uranium enrichment. (AP Photo/Vahid Salemi, File)