Chernobyl: Capping a Catastrophe - NYTimes.com
▻http://www.nytimes.com/interactive/2014/04/27/science/chernobyl-capping-a-catastrophe.html?_r=0
The costs are enormous — the Chernobyl arch alone will end up costing about $1.5 billion, financed largely by the United States and about 30 other nations.
And making the site of a radioactive disaster truly secure can take generations.
Engineers have designed the Chernobyl arch to stand for 100 years; they figure that is how long it may take to fully clean the area. But there have always been questions about Ukraine’s long-term commitment, and the political turmoil and tensions with Russia have raised new concerns. So even a century might not be enough.