Reactor core unloading tool

Abstract

The invention belongs to an unloading tool and particularly relates to a reactor core unloading tool for a nuclear reactor. The reactor core unloading tool comprises a rotation control assembly, a transmission pair assembly, a gripper assembly and a baseplate. The rotation control assembly rotates to drive the transmission pair assembly to move vertically to ensure that the gripper assembly connected with the transmission pair assembly moves horizontally in the baseplate, and a sliding plate of the gripper assembly tightens a reactor core assembly inside a baseplate notch, thus the entire tool is lifted to enable a lower tube seat of the reactor core assembly to separate from a grid plate so that the purpose of successfully unloading a reactor core is achieved. The reactor core unloading tool provided by the invention can guarantee the structural completeness of the assemblies by gripping the lower tube seat of a fuel assembly without damaging a fuel core section.

Description

Technical field [0001] The invention belongs to an unloading tool, and in particular relates to a core unloading tool for a nuclear reactor. Background technique [0002] The upper and lower parts of the core fuel assembly are connectors, that is, the upper tube seat and the lower tube seat, and the middle part is the core material. When using tools to grab the core fuel assembly, it is strictly prohibited to grab the middle core material section. The core fuel assembly is placed in the reactor core in such a way that the lower tube base of the core fuel assembly is matched with the grid plate, and a clearance fit is generally adopted. A grabbing tool is usually used to grab the upper tube seat of the core fuel assembly, and generally a small force can be used to separate the core fuel assembly from the grid plate. However, for unexpected reasons, such as an interference fit between the fuel assembly and the grid plate due to corrosion or other mechanical deformation, a large pu...

AI Technical Summary

Problems solved by technology

However, for accidental reasons, such as the interference fit between the fuel assembly and the grid plate due to corrosion or other mechanical deformation, a large pulling force is required to disengage the assembly and the grid plate, use existing tools and their ability to grab the core fuel assembly The method of upper nozzle can not separate the fuel assembly from the grid plate, and may damage the fuel core section, and cannot guarantee the structural integrity of the assembly

[0003] The currently used tool for grabbing the upper part of the core fuel assembly is a claw structure, which is used to grab the upper nozzle of the fuel assembly. This tool is suitable for the operation of conventional components entering and leaving the core, but for fuel When handling fuel assemblies with interference fit, there is a great risk because of its size and structure, it is difficult to accurately control the amount of force applied to the fuel assembly, so when the fuel assembly is unloaded, it is very easy to damage the fuel core section, and the nuclear fuel leak

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