Super-safe Sub-critical Reactors Driven by Accelerator
Brian Wang has a lot more information on this approach, and other fascinating new approaches to nuclear power. Apparently the cost of pumping neutrons has dropped considerably with the coming of cheaper superconducting particle accelerators for generating proton beams -- which generate spallation neutrons.
spallation neutrons, to drive the sub-critical fuels to fission.
Also check out how existing nuclear reactors can be uprated to produce between 20% and 50% more power -- using annular fuel rod technology.