There is a proposed fission reactor, which works with two fluids: reaction fluid (salt) and coolant (lead).
Supposedly eats all, Uranium, Plutonium, Thorium. Plutonium gets eaten faster than produced. Should be more efficient than other Thorium reactors.
See:
http://dual-fluid-reactor.org/
German site is much more extensive. If you read German, start here:
http://dual-fluid-reaktor.de/
Basically it’s not a military reactor, but a civil one. All of today’s Uranium reactors are made for producing Plutonium.
Those are just the claims given by the inventors. I haven’t checked any of them.