Vented nuclear fuel element
阅读：433发布：2022-06-26
专利汇可以提供Vented nuclear fuel element专利检索，专利查询，专利分析的服务。并且An improvement in a vented nuclear fuel element which, in operation of a nuclear reactor, discharges gaseous fission products generated in the fuel element into coolant, comprising a gas check valve including a gas permeable porous disk and such material that liquefies at operation temperature of a nuclear reactor, said porous disk and said material being disposed in combination in gas venting path, whereby in the operation the gaseous fission products being vented through said valve, and during shut down period of reactor said material solidifies to seal the fuel element from venting the gaseous fission products.，下面是Vented nuclear fuel element专利的具体信息内容。
1. A VENTED NUCLEAR FUEL ELEMENT FOR NUCLEAR REACTORS COMPRISING A TUBULAR CLADDING MEANS FOR CONTAINING NUCLEAR FUEL AND CHECK VALVE MEANS FOR VENTING GASEOUS FISSION PRODUCTS FROM SAID FUEL TO THE EXTERIOR OF THE FUEL ELEMENT, SAID CHECK VALVE MEANS INCLUDING POROUS MEANS FOR PASSING GASEOUS FISSION PRODUCTS FROM THE FUEL, SELECTIVE SEALING MEANS COVERING SAID POROUS MEANS FOR PASSING SAID GASEOUS FISSION PRODUCTS PASSED FROM SAID POROUS MEANS DURING OPERATION OF THE FUEL ELEMENT AND SEALING SAID POROUS MEANS DURING INOPERATION OF SAID FUEL ELEMENT, AND DISCHARGE MEANS FOR DISCHARGING SAID GASEOUS FISSION PRODUCTS TO THE EXTERIOR OF THE FUEL ELEMENT, SAID SELECTIVE SEALING MEANS BEING A MATERIAL IN A LIQUID STATE DURING OPERATION OF THE FUEL ELEMENT AND DIFFERENT FROM COOLANT SURROUNDING THE FUEL ELEMENT IN THE NUCLEAR REACTOR.
2. A vented fuel element according to claim 1, wherein said porous means prevent said selective sealing means material in the liquid state from contacting said fuel.
3. A vented fuel element according to claim 1, wherein said material of said selective sealing means is chemically inert with respect to said porous means.
4. A vented fuel element according to claim 1, wherein during inoperation of the fuel element the material of the selective sealing means is in a solid state such that a solid seal is formed over the porous means.
5. A vented fuel element according to claim 1, wherein the material of the selective sealing means is an alloy of lead and bismuth.
6. A vented fuel element according to claim 5, wherein said alloy consists essentially of 44.5 per cent lead and 55.5 per cent bismuth.
7. A vented fuel element according to claim 1, wherein the material of said selective sealing means is selected from the group consisting of mercury, bismuth, lead, tin and alloys thereof.
8. A vented fuel element according to claim 1, wherein said discharge means includes a capillary tube having one end extending from the area of said selective sealing means, a container cap connected to said tubular cladding means for forming a chamber around said capillary tube, and gas discharge openings in side portions of said container cap for discharging gaseous fision products to the exterior of the fuel element, said gaseous fission products passing through said capillary tube from said area of said selective sealing means into said chamber.
9. A vented fuel element according to claim 8, wherein said tubular cladding means of the fuel element are disposed vertically such that said capillary tube extends upwardly, said container cap is connected at an upper end of said tubular cladding means, and said gas discharge openings in said container cap are located below an end of said capillary tube opposite to the end near the area of said selective sealing means.
10. A vented fuel element according to claim 9, wherein a second porous means is included in said capillary tube at said end near the area of said selective sealing means.
11. A vented fuel element according to claim 1, wherein said tubular cladding means of the fuel element is disposed vertically.
12. A vented fuel element according to claim 11, wherein said check valve means is disposed at an upper end of said tubular cladding means.
13. A vented fuel element according to claim 12, wherein said porous means is mounted in a holder means disposed between saId fuel and the selective sealing means.
14. A vented fuel element according to claim 13, wherein said holder means projects upwardly into said material of said selective sealing means, said holder means having upwardly diverging peripheral sides, and wherein said material of said selective sealing means solidifies during inoperation of the fuel element such that the solidified material of the selective sealing means forms a solid seal around said holder means and porous means.
15. A vented fuel element according to claim 13, wherein said material of said selective sealing means contacts said holder means and said porous means.
16. A vented fuel element according to claim 1, wherein said material of said selective sealing means contacts said porous means.
17. A vented fuel element according to claim 1, wherein said porous member is tubular shaped having a closed end in contact with said material of said selective sealing means.
18. A vented fuel element according to claim 1, wherein the material of said selective means is in the liquid state when the fuel element is disposed in the nuclear reactor and in a solid state when the fuel element is disposed outside the nuclear reactor.
19. A vented fuel element according to claim 18, wherein said material is maintained in the liquid state in the nuclear reactor by heat from the coolant surrounding the fuel element.
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