Fuel assembly for power generating nuclear reactor
阅读：49发布：2022-11-27
专利汇可以提供Fuel assembly for power generating nuclear reactor专利检索，专利查询，专利分析的服务。并且A fuel assembly especially adapted for a pressurized water reactor is described. It comprises a support assembly of control element guide tubes, upper and lower end fittings, and grid spacers holding a plurality of fuel rods in vertical parallel relation. The fuel assembly features a removable upper end fitting allowing on-site access to and removal of individual fuel rods, and a novel guide tube construction providing high volume coolant flow through the assembly and allowing ready access of a grapple having laterally, outwardly extending gripping fingers to the assembly for lifting purposes.，下面是Fuel assembly for power generating nuclear reactor专利的具体信息内容。
1. A fuel assembly for a nuclear reactor, comprising an open support frame having vertically spaced upper and lower end fittings and intermediate grid spacers joined to a plurality of spaced parallel upright control-rod-receiving hollow, empty guide tubes and supporting in spaced parallel relation a plurality of separable upright fuel rods, fastening means removable from the top and removably connecting said upper end fitting directly to the guide tubes and separable from the guide tubes enabling individual fuel rod removal from the assembly, and means connected to the fastening means for lifting the assembly whereby the load path extends through said guide tubes, said fastening means being hollow to enable control rod passage therethrough.
2. A fuel assembly as claimed in claim 1 characterized in that the lower end fitting comprises an apertured plate permanently secured to the guide tube lower ends, and the fuel rods rest on the surface of the lower end fitting.
3. A fuel assembly as claimed in claim 2 characterized in that a plurality of said fuel rods are each aDjacent a plurality of apertures in the lower end fitting.
4. A fuel assembly for a nuclear reactor, comprising an open support frame having vertically spaced upper and lower end fittings and intermediate grid spacers joined to a plurality of spaced parallel upright control-rod-receiving guide tubes and supporting in spaced parallel relation a plurality of upright fuel rods, said upper end fitting being removably connected to the guide tubes and separable from the guide tubes and fuel rods enabling individual fuel rod removal from the assembly, said upper end fitting comprising separable top and bottom parts, said bottom part having an array of first apertures for receiving the upper ends of the guide tubes and an array of large second apertures for coolant flow, and removable fastening means for securing the said bottom part to the guide tubes.
5. A fuel assembly as claimed in claim 4 characterized in that the fastening means comprise nuts secured to threaded ends of only some but not all of the guide tubes.
6. A fuel assembly as claimed in claim 5 characterized in that the guide tubes adjacent the side borders of the bottom part are shorter than the remaining guide tubes.
7. A fuel assembly as claimed in claim 1 wherein the fuel rod tops terminate below the upper end fitting.
8. A fuel assembly for a nuclear reactor, comprising an open support frame having vertically spaced upper and lower end fittings and intermediate grid spacers joined to a plurality of spaced parallel upright control-rod-receiving guide tubes and supporting in spaced parallel relation a plurality of separable upright fuel rods, said upper end fitting comprising separable top and bottom parts and being removably connected to the guide tubes and separable from the guide tubes and fuel rods enabling individual fuel rod removal from the assembly, the top part of the upper end fitting being generally annular with a depending skirt portion engaging the end of said bottom part.
9. A fuel assembly as claimed in claim 8 characterized in that bolts removable from the top secure the said top part to the said bottom part.
10. A fuel assembly for a nuclear reactor, comprising an open support frame having vertically spaced upper and lower end fittings and intermediate grid spacers joined to a plurality of spaced parallel upright control-rod-receiving guide tubes and supporting in spaced parallel relation a plurality of separable upright fuel rods, said upper end fitting comprising separable top and bottom parts and being removably connected to the guide tubes and separable from the guide tubes and fuel rods enabling individual fuel rod removal from the assembly, fastening means removable from the top and joining the top and bottom parts of the upper end fitting, and fastening means removable from the top and securing the said bottom part to the guide tubes.
11. A fuel assembly as set forth in claim 10 wherein the removable fastening means for the guide tubes are located within a space formed between the top and bottom parts, and the top part forms a recess along its edge for receiving a grapple.
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