** FILE ** In this Feb. 15, 2012, file photo, provided by the Iranian President's Office, Iranian President Mahmoud Ahmadinejad, right, is escorted by technicians during a tour of Tehran's research reactor center in northern Tehran, Iran. (AP Photo/Iranian President's Office, File)

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** FILE ** In this Feb. 15, 2012, file photo, provided by the Iranian President's Office, Iranian President Mahmoud Ahmadinejad, right, is escorted by technicians during a tour of Tehran's research reactor center in northern Tehran, Iran. (AP Photo/Iranian President's Office, File)