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Open Image ModalThis photo provided by the U.S. Dept. of Energy, shows the construction of a \"tank farm\" to store nuclear waste in 1944 on the Hanford nuclear reservation near Richland, Wash. It is one of collection of photos documenting life in and around the reservation from 1943-1967. (AP Photo/U.S. Department of Energy, File) (credit:AP)
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Open Image ModalIn this July 14, 2010 photo, workers at the Hanford nuclear reservation work around a a tank farm where highly radioactive waste is stored underground near Richland, Wash. (AP Photo/Shannon Dininny, File) (credit:AP)
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Open Image ModalIn this March 23, 2004 file photo, workers at the tank farms on the Hanford Nuclear Reservation near Richland, Wash., measure for radiation and the presence of toxic vapors. (AP Photo/Jackie Johnston, File) (credit:AP)
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Open Image ModalSen. Ron Wyden, D-Ore., stands inside B Reactor to address the press during his tour of the Hanford Nuclear Reservation in Richland, Wash., Tuesday, Feb. 19, 2013. (AP Photo/The Oregonian, Jamie Francis) (credit:AP)
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Open Image ModalSen. Ron Wyden, D-Ore., center tours the Hanford Nuclear Reservation in Richland, Wash., Tuesday, Feb. 19, 2013. (AP Photo/The Oregonian, Jamie Francis) (credit:AP)
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Open Image ModalRuss Farbre, left, gives Sen. Ron Wyden, D-Ore., a tour inside B Reactor at Hanford Nuclear Reservation in Richland, Wash., Tuesday, Feb. 19, 2013. (AP Photo/The Oregonian, Jamie Francis) (credit:AP)
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Open Image ModalSen. Ron Wyden, D-Ore., right, tours a facility to treat contaminated groundwater with Energy Department manager Matt McCormick on Tuesday, Feb. 19, 2013. The facility, located on the Hanford nuclear reservation near Richland, Wash., is a key to cleaning up the highly contaminated site. (AP Photo/Shannon Dininny) (credit:AP)
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Open Image ModalSen. Ron Wyden, D-Ore., left, and Energy Department manager Matt McCormick, center, listen as Russ Fabre recounts the construction of the B Reactor at the Hanford nuclear reservation near Richland, Wash. on Tuesday, Feb. 19, 2013. Wyden said he supports legislation to recognize the reactor as part of a national park to honor the top-secret Manhattan Project to build the atomic bomb. (AP Photo/Shannon Dininny) (credit:AP)
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Open Image ModalSen. Ron Wyden, D-Ore., left, listens on Tuesday, Feb. 19, 2013, as Russ Fabre recounts the construction and operation of the first nuclear reactor, B Reactor, at the Hanford nuclear reservation near Richland, Wash. Wyden said he supports legislation to recognize the reactor as part of a national park to honor the top-secret Manhattan Project to build the atomic bomb. (AP Photo/Shannon Dininny) (credit:AP)
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Open Image ModalIn this April 3, 2008 file photo, a sign warns of radiation on the Hanford nuclear reservation near Richland, Wash. (AP Photo/Ted S. Warren, File) (credit:AP)
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Open Image ModalIn this July 14, 2010 photo, workers at the Hanford nuclear reservation work around a a tank farm where highly radioactive waste is stored underground near Richland, Wash. (AP Photo/Shannon Dininny) (credit:AP)
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Open Image ModalWorkers demolish a decommissioned nuclear reactor during the cleanup operations at the Western hemisphere\'s most contaminated nuclear site in Hanford, Washington state on March 21, 2011. AFP PHOTO/Mark RALSTON (credit:Getty Images)
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Open Image ModalWorkers wear protective clothing at the \'C\' Tank Farm at the Hanford Nuclear Reservation near Richland, Wash. on March 6, 2013. (AP Photo/Ted S. Warren) (credit:AP)
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Open Image ModalA herd of elk graze Monday, May 7, 2012 near the school at the old Hanford, Wash. town site on the Hanford Nuclear Reservation. (AP Photo/The Tri-City Herald, Richard Dickin) (credit:AP)
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Open Image ModalWorkers labor at the \'C\' Tank Farm at the Hanford Nuclear Reservation, Wednesday, March 6, 2013, near Richland, Wash. (AP Photo/Ted S. Warren) (credit:AP)