Technology Review published an article on the traveling wave reactor. The fuel supply available for this type of reactor estimated to be enough to last for a million years according to Terrapower.
Terrapower, a startup funded in part by Nathan Myhrvold and Bill Gates, is moving closer to building a new type of nuclear reactor called a traveling wave reactor that runs on an abundant form of uranium. The company sees it as a possible alternative to fusion reactors, which are also valued for their potential to produce power from a nearly inexhaustible source of fuel.
via Advanced Reactor Gets Closer to Reality – Technology Review.