Sleeve pipe type low-enriched uranium nuclear fuel assembly

Abstract

The invention discloses a sleeve pipe type low-enriched uranium nuclear fuel assembly which comprises an inner sleeve pipe, an outer sleeve pipe, a multilayer nuclear fuel sleeve pipe between the inner sleeve pipe and the outer sleeve pipe, an upper positioning tooth block, an upper joint, a lower joint and a lower positioning tooth block, wherein the inner sleeve pipe and the outer sleeve pipe are concentric; the upper positioning tooth block is fixedly connected with the upper end of the multilayer nuclear fuel sleeve pipe and arranged at the top of the outer sleeve pipe; the upper joint is fixed at the upper port of the upper positioning tooth block; the lower joint is sleeved on the lower port of the outer sleeve pipe; the lower positioning tooth block is arranged in the outer sleeve pipe and fixedly connected with the lower end of the multilayer nuclear fuel sleeve pipe; and each layer of nuclear fuel sleeve pipe comprises an aluminum alloy inner shell, an aluminum alloy outer shell and a U3Si2-Al nuclear fuel core which is arranged between the inner shell and the outer shell and forms metallurgical bonding with the aluminum alloy shells. The invention adopts a coextrusion process and has integral manufacture and simple process; a nuclear fuel sleeve pipe shell material is made of aluminum alloy and has favorable matching performance with the nuclear fuel core in use; the nuclear fuel core, the inner shell and the outer shell are extruded to form the fuel sleeve pipe of which the outer surface is provided with three ridge ribs, and the core and the shells form the metallurgical bonding, thereby improving the structural strength and the safe reliability.

Description

technical field [0001] The invention belongs to a nuclear fuel assembly, in particular to a low-enriched uranium nuclear fuel assembly. Background technique [0002] In order to reduce the enrichment degree of the research reactor fuel, the nuclear fuel of most experimental research reactors adopts low-enriched uranium nuclear fuel assembly to achieve low enrichment. The flat-plate or arc-plate low-enriched uranium nuclear fuel assemblies currently used in research reactors are represented by U 3 Si 2 -Al is the fuel core, and the rolling process is used to process the fuel plate into a flat or arc plate, and then inlay it on the side plate, and assemble it to form a square or round fuel assembly. The manufacturing process of this nuclear fuel assembly is complicated; Since the component is composed of a flat plate or an arc plate, the bending stiffness of the component is not good. Contents of the invention [0003] The object of the present invention is to provide a c...

AI Technical Summary

Problems solved by technology

The flat-plate or arc-plate low-enriched uranium nuclear fuel assemblies currently used in research reactors are represented by U 3 Si 2 -Al is the fuel core, using a rolling process, the fuel plate is first processed into a flat or arc plate, and then inlaid on the side plate, assembled to form a square or round fuel assembly. The manufacturing process of this nuclear fuel assembly is complicated; Since the components are composed of flat or arc plates, the bending stiffness of the components is not good

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