Patent Number: 
Section: claims

1. A cooling system for a nuclear fuel storage cask, the cooling system comprising:an inner passage extending around and circumscribing an inner perimeter of a nuclear fuel storage cask and extending along a length of the nuclear fuel storage cask, the length being evaluated between a first end and a second end of the nuclear fuel storage cask positioned opposite the first end;an outer passage positioned outward from the inner passage and in fluid communication with the inner passage;a coolant positioned within the inner passage and the outer passage, wherein the coolant is configured to move through the inner passage, absorbing heat from an inner cavity of the storage cask, and the coolant is configured to move through the outer passage, dissipating heat through an outer perimeter of the storage cask, wherein the inner cavity is circumscribed by an outer shell; anda lid to the outer shell, wherein the lid covers the inner cavity of the outer shell and the lid comprises a lid cooling circuit, the lid cooling circuit comprising a vapor passage and a lid outer passage distinct from one another, the lid outer passage positioned outward of the vapor passage, wherein the lid further comprises a lid coolant positioned within the lid cooling circuit, and wherein the lid coolant remains in the lid cooling circuit and circulates between the vapor passage and the lid outer passage. 2. The cooling system of claim 1, wherein the inner passage is an annular inner passage extending circumferentially around the inner perimeter of the nuclear fuel storage cask. 3. The cooling system of claim 1, wherein the outer passage is an annular outer passage extending circumferentially around the inner passage. 4. The cooling system of claim 1, further comprising an exit passage in fluid communication with the inner passage and the outer passage, wherein the exit passage is positioned at the first end of the nuclear fuel storage cask and extends circumferentially around the nuclear fuel storage cask. 5. The cooling system of claim 1, further comprising an exit passage in fluid communication with the inner passage and the outer passage, wherein the exit passage extends radially along the length of the nuclear fuel storage cask. 6. The cooling system of claim 1, further comprising a return passage in fluid communication with the inner passage and the outer passage, wherein the return passage is positioned at the second end of the nuclear fuel storage cask and extends circumferentially around the nuclear fuel storage cask. 7. The cooling system of claim 1, further comprising a return passage in fluid communication with the inner passage and the outer passage, wherein the return passage extends radially along the length of the nuclear fuel storage cask. 8. The cooling system of claim 1, further comprising a central cooling member extending through a center of the nuclear fuel storage cask.