Next Generation Nuclear Plants

Article suggests that with the latest most developed reactor all the spent uranium sitting in pools around the world can be burned up in the reactor, which could provide energy for thousands of years without the need for new uranium.

http://www.scientificamerican.com/article/can-sodium-save-nuclear-power/

Timeline though for commercial implementation is 2060 IF they can solve the sodium exploding in air issue among others.

This article goes into a bit of detail on all six reactor concepts:

http://www.*.com.au/r-the-key-to-nuclear-s-future-or-an-element-of-doubt-2014-10