Could you cite sources? The lowest estimates I saw put it at that 70 years for the currently active power plant park -- though that one even I consider unrealistic. A more realistic one I have at hand calculated with only 50% share of nuclear reached by 2030 and maintained from then on, and predicted depletion in 20 to 40 years.

_{*Lunatic*, n.
One whose delusions are out of fashion.}