A continuous dissolver for spent fuel elements with a screw pusher device

Abstract

A spent fuel element segment consistency dissolver provided with a spiral pushing device comprises a dissolving system, a dissolving circulation and filtration system, a waste jacket removing system and a tank bottom scale cleaning system. The spent fuel element segment consistency dissolver is characterized in that the dissolving system is mainly composed of a rectangular tray dissolving tank, a spiral shaft, a long slot, a partition board, a cooling jacket, a heating jacket, a narrow rectangular shield plate and a wide rectangular shield plate, the dissolving tank is fixed to a base plate through a support, the dissolving circulation and filtration system is arranged below the dissolving tank and is mainly composed of an n-shaped panel tank below the left side of the dissolver, a diode pump and a feeding tank, the waste jacket removing system is arranged below the higher end of the oblique bottom surface of the dissolving tank and comprises a waste jacket outlet branch pipe and a waste jacket outlet header pipe, and the tank bottom scale cleaning system is arranged at the bottom in the dissolving tank and comprises a front rotary shaft hanging bracket, a bevel gear drive component, a support, a steel brush shaft, a steel wire brush, a middle rotary shaft hanging bracket and a rear rotary shaft hanging bracket which are connected in sequence.

Description

technical field [0001] The invention relates to a spent fuel element section continuous dissolver with a spiral pusher device, which belongs to the technical field of spent fuel processing equipment at the back end of the nuclear fuel cycle. Background technique [0002] The spent fuel reprocessing plant is used to process the spent fuel components unloaded from nuclear power plant reactors, and recover usable fissile materials to realize the closed loop of nuclear fuel. So far, the mainstream power reactor spent fuel reprocessing process is the PUREX process. The first step of this process is cut-leaching, and the dissolver is the key equipment for fuel leaching. According to its mode of operation, it can be divided into batch dissolver and continuous dissolver. The mechanical structure of the batch dissolver is relatively simple, the dissolution rate of spent fuel is not constant and there are obvious gas peaks when exhausting, and neutron poisons are required for dissolu...

AI Technical Summary

Problems solved by technology

In order to maintain the rolling parts and replace the rollers, a special high-radiation maintenance heat chamber is set above the high-radiation melting heat chamber. When necessary, the spoon wheel and the upper cover of the dissolver are lifted into the maintenance heat chamber. The heat chamber is installed with The master-slave manipulator, a 50KN overhead crane and a remote-controlled crane equipped with a remote-controlled manipulator, this arrangement uses very complex technologies and equipment, huge plant facilities, and very high construction, operation and maintenance costs

Images