In this Sept. 17, 2007 file photo the sheltered reactor No. 4 of the Chernobyl nuclear power plant is seen in Ukraine. Twenty-two years after the world's worst nuclear accident, work is under way to erect a new, safe confinement that officials hope would help solve at least one the many problems associated with Chernobyl, the risk of further contamination. (AP Photo/Sergei Chuzavkov, File)

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