Nuclear reactor control rod drive mechanism and driving method thereof

Abstract

The invention discloses a nuclear reactor control rod drive mechanism and a driving method thereof. The nuclear reactor control rod drive mechanism comprises a rotary encoder, a brake, a reluctance motor, two bearings, bearing seats, a spring upper fixing base, a spring outside guiding sleeve, a planetary roller screw pair, a spring, a spring inside guiding sleeve, a spring lower supporting seat,a connecting sleeve, a hollow guiding rod, an upper supporting plate and a guiding tube, wherein the planetary roller screw pair comprises a planetary roller screw pair lead screw and a planetary roller screw pair nut. According to the nuclear reactor control rod drive mechanism and the driving method thereof, provided by the invention, structural defects in the prior art are overcome, the life ofthe control rod drive mechanism can be prolonged by over ten times, the reliability is high, original accuracy and structure can be maintained unchanged after emergency rod drop, and work can be rapidly restored by the original accuracy. In addition, the lead screw provided by the invention has no need of threading out a top cover of a nuclear reactor, the total height of the reactor is reduced by about 20%, and the reactor has a small size and occupies a small space of a ship platform.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor control, in particular to a closed rotor nut lifting reluctance motor type nuclear reactor control rod driving mechanism and a driving method thereof. 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 on ship platforms. It has short service life and low reliability. After the rotor is cracked, it cannot be closed with the original precision after emergency...

AI Technical Summary

Problems solved by technology

[0003] The cracked rotor reluctance motor type control rod drive mechanism is mostly used on ship platforms. It has short service life and low reliability. After the rotor is cracked, it cannot be closed with the original precision after emergency stop and the rods are dropped. When the second start is forced to close, the meshing surface of the screw rod will be caused. bump damage

[0004] At present, the control rod drive mechanisms of the magnetic lifting type and the split rotor reluctance motor type are both lifting and lowering by a screw rod. When the screw rod is lifted, the screw rod needs to pass through the top cover of the reactor, and the penetration height accounts for about 20% of the total height of the reactor. The reactor is taller and larger, taking up more space on the ship's platform

Images