A device for disintegrating spherical fuel elements by high-voltage electric pulse containing a ring clamp

Abstract

The invention discloses a high voltage electric pulse spherical fuel element disassembling device provided with a circular clamp. The high voltage electric pulse spherical fuel element disassembling device contains a support, an elevating mechanism, a discharging cavity, a high voltage electrode, a ground electrode, and the circular clamp; the elevating mechanism is arranged at the bottom of the support; the high voltage electrode is fixedly arranged at the top of the support; the discharging cavity is fixedly arranged on the elevating mechanism; the high voltage electrode and the ground electrode are both designed to be flat plate type; the ground electrode is fixedly arranged at the bottom of the discharging cavity, and is also taken as a sieve screen; the circular clamp is fixedly arranged on the ground electrode; a fuel element is subjected to self-adaption fixing using the circular clamp, and the distance from the fuel element to the high voltage electrode is controlled to be 1 to8mm. In high voltage pulse discharging process, shock wave generated by discharging is capable of realizing disassembling of the fuel element, fragments are separated through filtering using the ground electrode; an elevating platform is adopted to adjust discharging gap, continuous discharging is carried out until fuel element complete disassembling is realized. The high voltage electric pulse spherical fuel element disassembling device can be used for fuel element complete disassembling directly, the disassembling energy efficiency is high, working voltage is reduced, the size is small, andno secondary pollution is caused.

Description

technical field [0001] The invention relates to a device for dismantling spherical fuel elements with high-voltage electric pulses, which is suitable for dismantling high-temperature reactor spherical fuel elements under radioactive conditions, and belongs to the technical field of radioactive spent fuel reprocessing. Background technique [0002] It is very important to reprocess the spent fuel of high-temperature gas-cooled reactors, and it is necessary to conduct special disintegration research in view of the particularity of the structure of the spherical fuel elements used in it. Among various disintegration methods, the high-voltage electric pulse method has the characteristics of fast disintegration speed, no consumption of chemical reagents, no secondary waste, and no dust generation during the treatment process. It is a more promising method. [0003] At present, there is no dedicated high-voltage electric pulse disintegration device for high-temperature reactor fue...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no dedicated high-voltage electric pulse disintegration device for high-temperature reactor fuel elements. The existing relevant reports are to use commercial high-voltage electric pulse devices to disintegrate cylindrical graphite blocks, TRISO particles, graphite fragments, etc., and there are problems It is a phenomenon of energy waste, and the energy efficiency of disintegration is low

The reason for this is that it is a commercial device, and its normal use is to crack an insulator or a small amount of conductor-type material covered by an insulator, so there is no need to consider the short circuit between the high-voltage electrode and the ground electrode during discharge, and when the main material of the crack is graphite material , graphite is conductive and may cause a short circuit between the high voltage electrode and the ground electrode

In order to prevent the short-circuit from damaging the high-voltage electric pulse device, in the case that the internal electrical circuit of the commercial device cannot be changed, the solution adopted in the existing reports is to artificially lengthen a gap between the high-voltage electrode and the ground electrode, and use water to The resistance at the time of dielectric breakdown is used as the current limiting resistance at the time of short circuit, which leads to the waste of disassembly energy

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