Patent Number: 
Section: claims

1. A liquid metal or molten salt cooled nuclear reactor comprising a generally cylindrical containment vessel with a multi-lobed reactor vessel with at least two lobes each lobe interconnected with the other lobe and each lobe containing a fast reactor core. 2. The liquid metal or molten salt coolant nuclear reactor of claim 1, wherein the lobes have a generally circular geometry. 3. The liquid metal or molten salt coolant nuclear reactor of claim 1, wherein there are three to nine lobes. 4. The liquid metal or molten salt coolant nuclear reactor of claim 1, wherein there are three to six lobes. 5. The liquid metal or molten salt coolant nuclear reactor of claim 1, wherein the liquid metal or molten salt coolant is a heat transfer material selected from the group consisting essentially of sodium, sodium and potassium, lead, lead and bismuth, sodium fluoride, potassium fluoride and potassium fluoride and mixtures thereof. 6. A liquid metal or molten salt coolant nuclear reactor comprising at least a three-lobed reactor vessel, in a closed bottom containment vessel having a cylindrical wall for holding a pool of liquid metal or molten metal salt coolant; the at least three-lobed reactor vessel having at least three lobes each lobe interconnected with the other lobe and each lobe containing a fast reactor core. 7. The liquid metal or molten salt coolant nuclear reactor of claim 6, wherein the lobes have a generally circular geometry. 8. The liquid metal or molten salt coolant nuclear reactor of claim 6, wherein there are three to nine lobes. 9. The liquid metal or molten salt coolant nuclear reactor of claim 6, wherein there are four to five lobes. 10. The liquid metal or molten salt coolant nuclear reactor of claim 6, wherein the liquid metal or molten salt coolant is a heat transfer material selected from the group consisting essentially of sodium, sodium and potassium, lead, lead and bismuth, sodium fluoride, potassium fluoride and potassium fluoride and mixtures thereof. 11. The liquid metal or molten salt coolant nuclear reactor of claim 6, wherein the liquid metal of the coolant is sodium. 12. The liquid metal or molten salt coolant nuclear reactor of claim 6, wherein the containment vessel has a cylindrical wall and four lobes. 13. The liquid metal or molten salt coolant nuclear reactor of claim 6, wherein the containment vessel has a cylindrical wall and five lobes.