Nuclear power station control rod guide cylinder

Abstract

The invention discloses a nuclear power station control rod guide cylinder. The nuclear power station control rod guide cylinder comprises a protective cover and a whole-course guide assembly installed in the protective cover. The whole-course guide assembly comprises at least one whole-course continuous guide element, a whole-course continuous guide channel is arranged in the whole-course continuous guide element, and the whole-course continuous guide channel conducts whole-course continuous guide on at least one control rod in the single control rod assembly within the stroke range of the guide cylinder. Compared with the prior art, the nuclear power station control rod guide cylinder has the advantages that discontinuous guide section structures of the guide gratings arranged at intervals are changed into whole-course continuous guide sections formed by long duplex pipe structures, so that the control rod stroke protection function is optimized, and the risk that the control rod is bent and deformed due to transverse impact of fluid in an upper cavity is reduced; the integrity of the control rod structure is ensured; meanwhile, the wear resistance of the specific position of the control rod guide cylinder is improved, so that the service life of the control rod guide cylinder is greatly prolonged, and the later operation cost is reduced.

Description

technical field [0001] The invention belongs to the field of guiding control rods of a pressurized water reactor nuclear power plant, and more specifically relates to a control rod guiding cylinder of a nuclear power plant. Background technique [0002] The control rod drive line of pressurized water reactor is mainly composed of control rod drive mechanism, pressure vessel socket, thermowell, control rod guide tube, fuel assembly and so on. When the reactor is running, the control rods mainly move up and down along the drive line between the roof chamber, the upper chamber and the core chamber. Because the control rods are affected by the fluid at different heights, if there is no protective device for the control rod running channel, the control rod will be subject to violent swings, deviate from the vertical direction, and cannot work normally. Therefore, the control rod guide cylinder is set to guide and protect the control rods. When the control rods are running in the...

AI Technical Summary

Problems solved by technology

This causes the specific positions of the guide grids 102, 111 to wear quickly, resulting in a short service life of the entire control rod guide cylinder, and it is often necessary to replace the worn out control rod guide cylinder during the life of the reactor.

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