Bill Gates and China partner on world-first nuclear technology BY Cole Latimer FROM Sydney Morning Herald

"The reactor could be fuelled with natural uranium, depleted uranium or even spent nuclear fuel (which is mainly depleted uranium), but the reactor must be started with enriched uranium. Thus, the Travelling Wave Reactor would have the potential to use less nuclear fuel and produce less nuclear waste than the light water reactors that dominate today's nuclear fleet" 

"It is also safer as spent fuels, such as depleted uranium, from other reactor types could be recycled without separating out plutonium, and could operate without refuelling for up to 40 years."