Patent Number: 
Section: claims

1. A transportable nuclear battery comprising:a sealed reactor shell;a reactor core;a nuclear fuel in the reactor core, the nuclear fuel comprising plutonium, carbon, hydrogen, zirconium, and thorium, the hydrogen contained in glass microspheres coated with a burnable poison; anda generator;wherein the hydrogen is stored in the glass microspheres as a moderator to control reactivity of the reactor core. 2. The nuclear battery of claim 1, wherein the burnable poison comprises a thermal neutron absorber selected to increase absorption of neutrons in the thorium, such that depletion of the burnable poison during operation of the reactor core shifts an energy spectrum of the neutrons toward low neutron energy. 3. The nuclear battery of claim 2, wherein neutron hydrogen collisions inside the glass microspheres improve utilization of fissile material generated from the absorption of neutrons in the thorium. 4. The nuclear battery of claim 1, wherein the burnable poison comprises boron, boron carbide or erbium. 5. The nuclear battery of claim 1, further comprising a coating on the glass microspheres, the coating configured to aid in keeping the hydrogen within the glass microspheres at high temperature. 6. A high temperature gas cooled reactor comprising the nuclear battery of claim 5. 7. The nuclear battery of claim 1, wherein the nuclear fuel comprises a mixture of the hydrogen containing glass microspheres and fuel microspheres, the fuel microspheres comprising the uranium and plutonium. 8. The nuclear battery of claim 7, wherein the mixture of hydrogen containing glass microspheres and fuel microspheres is comprised within a fuel rod inserted into a moderator block. 9. The nuclear battery of claim 8, further comprising a plurality of fertile material pellets surrounding the fuel rod in the moderator block, the fertile material pellets comprising the thorium. 10. The nuclear battery of claim 9, wherein the reactor core is assembled with a plurality of such moderator blocks inside the reactor shell, the moderator blocks comprising graphite.