Fuel assembly for a nuclear reactor using zirconium alloy clad fuel rods专利检索-核燃料棒燃料组件堆芯核反应堆核能电厂发电厂分销网络和设备专利检索查询-专利查询网

Fuel assembly for a nuclear reactor using zirconium alloy clad fuel rods

阅读：391发布：2022-01-30

专利汇可以提供Fuel assembly for a nuclear reactor using zirconium alloy clad fuel rods专利检索，专利查询，专利分析的服务。并且Zirconium alloy structural materials for fuel rods are desirable in nuclear fuel assembly construction due to their low neutron absorption cross section properties. However, zirconium alloys are difficult to utilize due to their inability to be welded with other commonly-used fuel assembly construction materials such as inconel or stainless steel and their thermal expansion coefficient, which is significantly smaller than the inconel or stainless steel alloys commonly-used. The latter characteristic may result in buckling of the fuel assembly in a changing thermal environment. To obviate these difficulties in utilizing fuel rod cladding and/or fuel assembly cans of zirconium alloy with other structural elements such as a spacer grid formed from other materials, provisions are made herein for: (1) a fuel assembly construction having a zirconium alloy enclosure including means for attaching structural elements such as nozzles or grids of other materials thereto, and (2) a stainless steel enclosed fuel assembly having zirconium alloy clad fuel rods, including means for permitting relative movement of the fuel assembly parts due to differences in the thermal expansion rates of elements in the fuel assembly.，下面是Fuel assembly for a nuclear reactor using zirconium alloy clad fuel rods专利的具体信息内容。

权利要求

1. A fuel assembly for use in nuclear reactor comprising: a. a plurality of generally elongated fuel elements; b. a generally thin-walled fuel enclosure formed from a zirconium base alloy surrounding and essentially coextensive with the fuel elements; c. a plurality of fuel support grid assemblies formed from a material selected from the group consisting of nickel base alloys and iron base alloys having good spring qualities under radiation, said assemblies positioned within said enclosure to maintain the fuel elements in a generally fixed spaced relationship but allowing for longitudinal movement of the fuel elements resulting from thermal expansion; d. each said fuel support grid assembly including a plurality of resilient and outwardly extending mounting tabs located around the periphery of said grid assembly; and e. a retaining means contacting said mounting tabs and metallurgically bonded to said thin-walled fuel enclosure for fixedly supporting said grid assemblies.

2. A fuel assembly as in claim 1 a. wherein each fuel support grid assembly includes a plurality of mounting tabs located around its periphery; each mounting tab having an aperture therein; and b. wherein the fuel support grid assembly securing means includes buttons of a zirconium base alloy inserted through the apertures of the mountIng tabs, respectively, the buttons being welded to the fuel enclosure so as to fixedly secure the grid assembly to the fuel enclosure.

3. A fuel assembly as in claim 2 wherein the mounting tabs are resilient and extend outwardly of the periphery of the grid assembly and resiliently engage the enclosure thereby permitting expansion of the grid assembly relative to the fuel enclosure during periods of thermal transients within the reactor.

4. A fuel assembly as in claim 1 further comprising a. a plurality of mounting tabs located around the upper and lower peripheries of each grid assembly; and b. upper and lower mounting straps formed from the same material as the enclosure, said mounting straps having periodically raised portions to allow for insertion of the respective mounting tabs, and being secured to the enclosure along the non-raised portions thereof.

5. A fuel assembly as in claim 4 wherein the mounting tabs are resilient and extend outwardly of the periphery of the grid assembly and resiliently engage the enclosure thereby permitting expansion of the grid assembly relative to the fuel enclosure during periods of thermal transients within the reactor.

6. A fuel assembly for use in a nuclear reactor comprising: a. a plurality of generally elongated fuel elements; b. a stainless steel fuel enclosure surrounding and essentially coextensive with said fuel elements; c. a plurality of enclosure stiffening grids having a lattice shaped configuration and forming a plurality of openings through which each fuel element passes, said fuel elements being spaced apart from and disjoined to the openings of the stiffening grid; d. a plurality of fuel support grids each comprising a generally lattice-shaped frame having a plurality of resilient means extending therefrom frictionally engaging the fuel elements respectively, said support grids being spaced from the enclosure; e. means for securing each enclosure stiffening grid to the fuel enclosure to give support thereto; and f. spacing means engaging each fuel support grid to longitudinally space said support grids.

7. A fuel assembly as in claim 6 wherein each fuel element passes through an opening in the lattice of each stiffening grid and is spaced from the sides thereof.

8. A fuel assembly of claim 6 including: a. a top end plate; b. a bottom end plate; c. means for securing the upper end of the fuel enclosure structure to the top end plate and the lower end of the fuel enclosure structure to the bottom end plate; d. a plurality of elongated tie rods passing through the stiffening grids and the fuel support grids; e. means for securing the ends of tie rods to the upper and lower plate end f. means for securing the fuel support grids to the tie rods.

9. A fuel assembly as in claim 8 wherein at least some of the tie rods comprise clad short length fuel rods mounted in tandem and coupled at the fuel support grids by elongated solid end plugs.

10. A fuel assembly as in claim 1 having a stainless steel top nozzle plate secured to the upper portion of the fuel enclosure; and having a stainless steel bottom nozzle plate secured to the lower portion of the fuel enclosure.

11. A fuel assembly as in claim 9 further comprising top and bottom nozzles including top and bottom nozzle plates respectively, each having generally flanged outer peripheries and having a plurality of channels located therein; and a plurality of flanged buttons fitted therethrough in abutted relationship with the enclosure and spot welded thereto.

12. A fuel assembly as in claim 2 wherein the fuel enclosure includes a bar located in each corner thereof and extending the length of the enclosure, and means securing the bars to the enclosure.

说明书全文

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