MOTOR-DRIVEN CENTRIFUGAL PUMP FOR THE PRIMARY CIRCUIT OF SMALL OR MEDIUM-SIZED MODULAR NUCLEAR REACTORS

摘要

The present application relates to a motor driven centrifugal pump for circulating a heat transfer fluid in a primary circuit of a nuclear reactor. The motor-driven pump includes a sealed motor unit 12, a hydraulic unit 13 and a shaft 17, the shaft 17 being immersed in a heat transfer fluid, by the sealed motor unit 12 It is rotated, and pumps the heat transfer fluid by the impeller 22 of the hydraulic part 13 firmly connected to the shaft 17. The motor unit 12 includes a dry stator 18 and an immersed rotor 19 firmly connected to the shaft 17. The motor-driven pump also comprises an immersed flywheel (23) firmly connected to the shaft (17) between the rotor (19) of the motor unit (12) and the impeller (22) of the hydraulic part (13), Allow minimal deceleration time after the power supply is cut off; And an immersed anti-reverse device 60 configured to mechanically block the rotation of the shaft 17 in a predetermined direction.