When is it predicted that you will run out of uranium fuel?

Answer 1

The common estimate is that there is 50 times the energy reserves in Uranium as in fossil fuels. A common estimate is that we could run out of fossil fuels in 40 years. Therefore one can predict running out of Uranium in 50 * 40 years, or 2000 years.

However this is assuming use of only reactors operating on thermal neutrons, which can burn only the uranium-235 isotope. But this is only 0.72% of natural Uranium. Use of fast breeder reactors which can make and burn Plutonium from the uranium-238 making up the other 99.28%, the reserves can be extended by about a factor of 100. In this case the Uranium will not run out for 200,000 years!