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Ever thought about how you would replace two 20 meter high and 300 ton heavy steam generators? At the Doel 1 nuclear power plant they did it by opening up the rooftop of the reactor building. Piece of cake? Yes, but one that required 5 years of intensive preparation by a team of engineers of Tractebel Engineering and 1200 people to carry out the job.
http://www.tractebel-engineering-gdfsuez.com/