Control rod drive mechanism and method for nuclear reactor

Abstract

The invention discloses a control rod drive mechanism and method for a nuclear reactor. The control rod drive mechanism for the nuclear reactor is characterized in that a nut of a planetary roller screw pair and a bearing are driven by rotation of a reluctance motor rotor to rotate in a fixed support seat, a screw is driven by rotation of the nut of the planetary roller screw pair and then drivesa guide rod to rise and fall linearly in a guide tube, a load is driven by the guide rod to reach a target position, and a spring moves with the screw for energy storage; a brake performs braking in apower keeping stage, and position of the load is kept; during emergency shut-down, tension stored during spring compression is transmitted to the nut of the planetary roller screw pair through the screw of the planetary roller screw pair, and the nut rotates to drive the screw to fall for rod drop. The control rod drive mechanism can be applied to a nuclear reactor of a ship platform, the servicelife of the control rod drive mechanism of the nuclear reactor is prolonged 10 times or more, work is resumed rapidly after emergency shut-down and rod drop on the premise that the original structureand precision are kept, and the safety and working efficiency of the nuclear reactor are improved.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor control, and specifically provides a closed-rotor screw lifting reluctance motor type nuclear reactor control rod driving mechanism and a method for using the same. Background technique [0002] The control rod drive mechanism is the key equipment in the nuclear reactor, which can complete the functions of reactor start-up, power regulation, power maintenance, normal shutdown and emergency shutdown according to the instructions of the reactor control and protection system. At present, control rod drive mechanisms based on the principle of magnetic lifting type and split rotor reluctance motor type are commonly used in pressurized water reactors in the world. [0003] The cracked rotor reluctance motor type control rod drive mechanism is mostly used in ship platforms and other equipment. The existing problems are short life, low reliability, failure to close with the original precision afte...

AI Technical Summary

Problems solved by technology

[0003] The cracked rotor reluctance motor type control rod drive mechanism is mostly used in ship platforms and other equipment. The existing problems are short life, low reliability, failure to close with the original precision after the rotor cracks and emergency stop, and the screw rod will be forced to close when the second start is forced to close. The collision damage of the meshing surface and the unpredictable motion accuracy seriously affect the safety and reliability of the nuclear reactor on the ship platform

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