Representatives of participating companies sign containers with uranium to be used as fuel for nuclear reactors, prior to loading them aboard Atlantic Navigator ship, on a port in St. Petersburg, Russia, Thursday, Nov. 14, 2013. A 20-year program to convert highly enriched uranium from dismantled Russian nuclear weapons into fuel for U.S. power plants has ended, with the final shipment loaded onto a vessel in St. Petersburg's port on Thursday. The U.S. Energy Department described the program, commonly known as Megatons to Megawatts, as one of the most successful nuclear nonproliferation partnerships ever undertaken. (AP Photo/Dmitry Lovetsky)
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