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Fuel assembly available for integral replacement

A fuel assembly and fuel element technology, which is applied in the field of nuclear reactors, can solve the problems of unstable mechanical fixation, inability to complete installation, and low component density, so as to improve service safety, reduce flow-induced vibration, and reduce the amount of charging. Effect

Active Publication Date: 2017-03-22
中科瑞华原子能源技术有限公司
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Problems solved by technology

The problem with the mechanical locking method is that the component density is lower than that of the coolant, and the installation cannot be completed, and due to the harsh service environment in the reactor, the mechanical fixing method may be unstable and easily damaged

Method used

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  • Fuel assembly available for integral replacement

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Embodiment Construction

[0019] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0020] refer to figure 1 , the structural features of the present invention are described in detail as follows:

[0021] A fuel assembly that can be used for integrated refueling, which is assembled from a certain number of fuel elements 1, upper nozzles 2, lower nozzles 3, and fixing rods 4 to form an integral structure; the integrated refueling fuel assembly is fixed by a top cover, and the fuel The element 1 is fixed at the upper end and free at the lower end; several fixing rods 4 are distributed inside the fuel assembly, the upper ends of the fixing rods 4 are directly fixed on the reactor top cover 5, and the lower ends of the fixing rods 1 are inserted into the reactor core support grid...

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PUM

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Abstract

The invention discloses a fuel assembly available for integral replacement. By fixation of the fuel assembly and a top cover, axial fixation of the fuel assembly is realized, a fuel assembly fixation problem caused by a high-density cooling agent of a liquid-state lead-based reactor is solved, and integral replacement of the fuel assembly is realized. Since fuel elements with fixed upper ends and free lower ends are reinforced under the action of axial flushing force and buoyancy of the cooling agent, stability of the fuel elements in operation of the reactor is improved; owing to a moderator filled in each fixed rod, fission neutron moderation can be accelerated to improve reactivity of a reactor core and reduce the size of the reactor core. The fuel assembly has advantages of high safety, simple structure, small reactor core size and the like.

Description

technical field [0001] The invention belongs to the field of nuclear reactors, in particular to a fuel assembly which can be used for integrated refueling. Background technique [0002] The liquid lead-based alloy cooling reactor fuel assembly is in service, due to the high density of the lead-based alloy coolant, the assembly cannot be installed and fixed by its own gravity. At present, the design of fixtures for liquid lead-based alloy cooling reactors in the world is quite different, mainly in the form of counterweights and mechanical locking. The specific method of counterweight is to add a denser counterweight material inside the component, so as to increase the overall density of the component to exceed that of the coolant, so that the component can be fixed by its own gravity; the specific method of mechanical locking is by placing the component in the middle The fuel rods are replaced by locking rods, which can fix the components by cooperating with the locking devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/33G21C5/00
CPCG21C3/33G21C5/00Y02E30/30
Inventor 赵柱民陈建伟吴庆生李春京
Owner 中科瑞华原子能源技术有限公司
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