I think you mean fissile instead of fissionable [1]. Current reactor technologie...

I think you mean fissile instead of fissionable [1]. Current reactor technologies consume a very small fraction of fissionable material. Reactors discharge nearly as much fissionable material as they take in. And the lifetime of uranium resource is highly dependent on the price you are willing to pay. Seawater contains enough uranium to supply all reactors in the world at current consumption rates for ~60,000 years [2] estimated to only be about 8x the current spot price [3]. Using fast reactor technology that has already been developed and researched heavily could also stretch the resource by another factor of 100X or more.