I think this is an interesting effort, but I question their fuel source - despite common perceptions, there's not a lot of suitable material around that could b

I think this is an interesting effort, but I question their fuel source - despite common perceptions, there's not a lot of suitable material around that could be recycled in this way, and what is available is of non uniform composition - like the waste from the experimental reactor design they mention. That factor could make reprocessing the stuff into fuel suitable for a given micro design expensive. It's great that they're trying to use waste material to reduce the waste stream, but that's far from the biggest problem new reactor designs face... by volume, nuclear waste produced by power plants just isn't that much material. If these folks were somehow saying they could recycle the waste generated over decades of bomb making, that would be worthwhile... but that's not really usable waste.