Apparatus and method for stripping tritium from molten salt
A method of stripping tritium from flowing stream of molten salt includes providing a tritium-separating membrane structure having a porous support, a nanoporous structural metal-ion diffusion barrier layer, and a gas-tight, nonporous palladium-bearing separative layer, directing the flowing stream of molten salt into contact with the palladium-bearing layer so that tritium contained within the molten salt is transported through the tritium-separating membrane structure, and contacting a sweep gas with the porous support for collecting the tritium.
1. A method of stripping tritium from flowing stream of molten salt comprising the steps of:
a. providing a tritium-separating membrane structure having a porous support selected from a group consisting of stainless steel and nickel-based alloy, a nanoporous structural metal-ion diffusion barrier layer supported by and in contact with said porous support, and a gas-tight, nonporous palladium-bearing separative layer supported by and in contact with said nanoporous structural metal-ion diffusion barrier layer;
b. directing the flowing stream of molten salt into contact with said palladium-bearing layer so that tritium contained within the molten salt is absorbed by said nonporous palladium-bearing separative layer, transported through said tritium-separating membrane structure; and
c. contacting a sweep gas with said porous support for collecting the tritium.
2. A method in accordance with claim 1 wherein said porous support comprises 316 stainless steel.
3. A method in accordance with claim 1 wherein said structural metal-ion diffusion barrier layer comprises at least one material selected from the group consisting of yttrium-stabilized zirconia, scandia stabilized zirconia, alumina, titania, chromia, and chromium nitride.
4. A method in accordance with claim 1 wherein said gas-tight, nonporous palladium-bearing separative layer comprises a palladium alloy.
5. A method in accordance with claim 4 wherein said palladium alloy comprises a palladium-silver alloy.
6. A method in accordance with claim 1 wherein said tritium-separating membrane structure comprises at least one structure disposed within an outer containment structure.