The damaged reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine Tuesday, Nov. 27, 2012. Workers on Tuesday, Nov. 27, 2012 raised the first section of a colossal arch-shaped structure that is eventually to cover the exploded reactor at the Chernobyl nuclear power station. Project officials on Tuesday hailed the raising as a significant step in a complex effort to liquidate the consequences of the world's worst nuclear accident, in 1986. (AP Photo/Efrem Lukatsky)

Associated Press
The damaged reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine Tuesday, Nov. 27, 2012. Workers on Tuesday, Nov. 27, 2012 raised the first section of a colossal arch-shaped structure that is eventually to cover the exploded reactor at the Chernobyl nuclear power station. Project officials on Tuesday hailed the raising as a significant step in a complex effort to liquidate the consequences of the world's worst nuclear accident, in 1986. (AP Photo/Efrem Lukatsky)
The damaged reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine Tuesday, Nov. 27, 2012. Workers on Tuesday, Nov. 27, 2012 raised the first section of a colossal arch-shaped structure that is eventually to cover the exploded reactor at the Chernobyl nuclear power station. Project officials on Tuesday hailed the raising as a significant step in a complex effort to liquidate the consequences of the world's worst nuclear accident, in 1986. (AP Photo/Efrem Lukatsky)
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