A nuclear fuel element core removal device

Abstract

The invention discloses a nuclear fuel element core body removing device including a fixed clamping block, a movable clamping block, an eject pin and a guide sleeve. The upper end face of the fixed clamping block is formed in a two-step stepped shape; the movable clamping block is arranged on a region at a lower horizontal position of the upper end face of the fixed clamping block and is connected with the fixed clamping block; the end part of one end of the guide sleeve is connected with the side wall of one side at a higher horizontal position of the upper end face of the fixed clamping block. The lower end face of the movable clamping block is provided with an upper semicircular groove, the upper end face of the fixed clamping block is provided with a lower semicircular groove corresponding to the upper semicircular groove position, the fixed clamp block is provided with a circular pore channel for communicating the lower semicircular groove with a guide sleeve internal channel, the center lines of the upper semicircular groove, the lower semicircular groove, the circular pore channel and the guide sleeve internal channel are justified, and one end of the eject pin successively passes through the guide sleeve internal channel and the circular pore channel. By adopting the above structure, the nuclear fuel element core body removing device has compact structure, is easy to transport, can improve the removal efficiency of a core body while being used for removing a core body in a cladded shell, and can avoid the cladded shell from being suffered from secondary damage.

Description

technical field [0001] The invention relates to auxiliary equipment in the field of nuclear testing, in particular to a nuclear fuel element core removal device. Background technique [0002] The research on cladding after irradiation must first remove the fuel core inside the cladding. Under the action and influence of high temperature, gas-solid fission products and high-energy particles, the core will cause swelling, thermal stress, lattice destruction and corrosion, etc. Destruction, part of the core body and the cladding are bonded and so on. In the heat chamber, it is difficult to remove the fuel core only by relying on the master-slave manipulator. [0003] At present, there are two main methods for removing the core body. The most commonly used method is the thimble inertia removal method, that is, the cladding is fixed with a spacer, the thimble falls from above, and the core is removed by using the inertia of the thimble. The main disadvantage of this method is th...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the cladding is easily damaged and inefficient when removing the inner core of the nuclear fuel element cladding, and provides a nuclear fuel element core removal device, which is used for removing the inner core of the nuclear fuel element cladding Avoid secondary damage to cladding and improve core removal efficiency

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