checkout fast breeder reactors. This is why I am so excited about them specifically:
https://www.theguardian.com/environment/2012/jul/30/fast-bre...
And if the UK didn't do silly thing like selling profitable nuke companies to Japan (source senior guy at Sellafield) - and allow you junior collation partners to kill of a key project to placate the green wing of the libdems.
BTW I worked on research for fast breeders in my first job in fact one of the few times I went into our labs was to wrap a dummy fuel pin for two-phase flow tests.