Patent Number: 
Section: claims

1. An reactor vessel comprising:a reactor core having a first set of channels and a second set of channels, a blanket salt flowing through the first set of channels and a fuel salt flowing through the second set of channels without mixing with the blanket salt; anda plenum that receives the blanket salt from the first set of channels, the blanket salt providing a breed-stock for a fission reaction in the fuel salt, and the blanket salt conducting heat exchange with the fuel salt in the reactor core by transferring heat generated by the fission reaction in the fuel salt to the blanket salt,wherein the reactor core is configured to be immersed in a pool of blanket salt so that the first set of channels are open to and in fluid communication with the pool of blanket salt. 2. The reactor vessel of claim 1 wherein the blanket salt exits the plenum into the pool of blanket salt. 3. The reactor vessel of claim 1 further comprising a first fuel salt plenum that receives the fuel salt from the reactor core and directs the fuel salt out of the reactor vessel. 4. The reactor vessel of claim 3 further comprising a second fuel salt plenum that receives the fuel salt and directs the fuel salt into the reactor core. 5. The reactor vessel of claim 1 wherein the reactor core is made of metal, graphite, or carbon-carbon composite. 6. The reactor vessel of claim 1 wherein the reactor core has generally a cylindrical shape. 7. The reactor vessel of claim 1 wherein the reactor core has generally a cubical shape. 8. A two-fluid molten-salt reactor comprising:an enclosure that includes a pool of blanket salt; anda reactor vessel that is immersed in the pool of blanket salt,the reactor vessel including:a reactor core having a first set of channels and a second set of channels, the first set of channels being open to and in fluid communication with the pool of blanket salt, the blanket salt flowing through the first set of channels and a fuel salt flowing through the second set of channels without mixing with the blanket salt; anda plenum that receives the blanket salt from the first set of channels, the blanket salt providing a breed-stock for a fission reaction in the fuel salt, and the blanket salt conducting heat exchange with the fuel salt in the reactor core by transferring heat generated by the fission reaction in the fuel salt to the blanket salt. 9. The reactor of claim 8 wherein the blanket salt exits the plenum into the pool of blanket salt. 10. The reactor of claim 8 further comprising a first fuel salt plenum that receives the fuel salt from the reactor core and directs the fuel salt out of the reactor vessel. 11. The reactor of claim 10 further comprising a second fuel salt plenum that receives the fuel salt and directs the fuel salt into the reactor core. 12. The reactor of claim 8 wherein the reactor core is made of metal, graphite or carbon-carbon composite. 13. The reactor of claim 8 further comprising at least one pump bowl connected to the reactor vessel, the at least one pump bowl pumping fuel salt into the reactor core. 14. The reactor of claim 8 further comprising at least one secondary heat exchanger that receives heated blanket salt from the reactor vessel, transfers the heat from the blanket salt to a fluid without mixing the fluid with the blanket salt, the blanket salt being cooled by the transfer of heat to the fluid, and returns the cooled blanket salt to the pool of blanket salt. 15. The reactor of claim 14 wherein the fluid is a non-radioactive tertiary salt.