Control rod drive mechanism and its coil components

Abstract

The invention discloses a control rod driving mechanism and a coil part thereof. The coil part comprises a coil assembly, a support piece, screw rods and a wiring seat, wherein the coil assembly comprises a coil lifting assembly, a coil moving assembly and a coil fixing assembly which are split, the coil lifting assembly, the coil moving assembly and the coil fixing assembly are arranged on a sealing shell and are supported and isolated by the support piece, the coil lifting assembly, the coil moving assembly and the coil fixing assembly are connected and fixed by the screw rods, the wiring seat is arranged at the top of the coil lifting assembly, and the coil assembly is connected with a rod control system by an electrical plug-in piece arranged on the wiring seat. Compared with the prior art, the coil part has the advantages that the three split type coil assemblies are employed, no common magnetic yoke structure is needed, magnetic crosstalk and magnetic leakage are reduced, and moreover, disassembly, assembly, transportation, maintenance and replacement of the coil part are facilitated.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and more specifically, the invention relates to a control rod driving mechanism and a coil component thereof. Background technique [0002] The reactor control rod bundle is arranged in the core and interspersed in the fuel assembly. Its main function is to drive the control rod bundle to perform precise positioning in the fuel assembly through the step-by-step lifting and lowering actions of the control rod drive mechanism, so as to realize the reactor Power control, when the mechanism is powered off, the rods of the rod bundle assembly are controlled to drop, so as to achieve the purpose of shutdown. [0003] At present, most pressurized water reactor nuclear power plants use a magnetic pin claw control rod drive mechanism, which is composed of a pressure shell part, a claw part, a coil part, a drive rod part and a rod position detector. By turning on and off the power of the coil part a...

AI Technical Summary

Problems solved by technology

[0006] 1) The yoke is composed of 4 parts and fixed into a whole, and connected by screws and nuts, which is not conducive to the disassembly and transportation of a single coil, and there is a situation where two adjacent coils share a yoke, which increases the occurrence of series flux and magnetic flux leakage occur;

[0007] 2) The magnetic yoke has a square structure and is arranged compactly on the top of the pile, which is not conducive to convective heat transfer of external air;

[0008] 3) The yoke is cast from ductile iron with relatively low thermal conductivity, which is not conducive to the heat conduction of the coil;

[0009] 4) The coil material, especially the material of the coil skeleton, limits the overall temperature resistance level of the coil, so it is necessary to set up an external forced ventilation cooling device

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