A large-scale shielded main pump dismantling device and dismantling process in a radioactive environment

Abstract

The invention discloses a dismantling device and a dismantling process of a large-scale shielded main pump in a radioactive environment, belonging to the technical field of maintenance of a large-scale shielded main pump of a nuclear power plant. The invention includes an impeller nut locking pin removal assembly, a C-ring cutting assembly, a lower radial bearing disassembly and a rotor core-pulling assembly. The impeller nut locking pin removal assembly includes an upper plate, a lower plate, a connecting screw, a double-ended screw rod, Fixing nuts, adjusting nuts; C-shaped ring cutting components include wall-mounted components and cutting components; wall-mounted components include pressure plates and wall-mounted main bodies; lower radial bearing removal and rotor core-pulling components include base plates for connecting base plates and pumps The base plate support of the body, the double-ended screw rod used to connect the base plate and the lower radial bearing and the nut connected to the double-ended screw rod, the lifting lugs on the base plate, and the connecting lugs used to connect the base plate and the pump Rotor support tools and spacers for the shaft, main bolts for connecting the foundation plate to the pump body. The invention has simple operation and can safely and efficiently complete the dismantling of the large shielded main pump.

Description

technical field [0001] The invention relates to the technical field of maintenance of a large-scale shielded main pump of a nuclear power plant, in particular to a dismantling device and a dismantling process of a large-scale shielded main pump in a radioactive environment. Background technique [0002] After the nuclear power plant has been in operation for a long time, the shielded reactor coolant pump (hereinafter referred to as: shielded main pump) thrust bearing, shielding sleeve and lower locking cup may have problems. Different from the dismantling process of the shielded main pump in the manufacturing plant, after the long-term operation of the shielded main pump of the nuclear power plant, the radioactive dose of the components in contact with the primary circuit medium is relatively high, so it is necessary to solve the disassembly of the shielded main pump components in a radioactive environment; and also need Solve the cutting of the C-type seal at the lower part...

AI Technical Summary

Problems solved by technology

Due to the small radial clearance between the lower radial bearing and the shielded main pump stator, the lower radial bearing cannot be disassembled normally after the bulge occurs

2. Core-pulling of the rotor assembly: After the shielding sleeve bulges, especially the bulging of the stator shielding sleeve between the lower radial bearing of the shielding main pump and the rotor winding, it seriously hinders the core-pulling of the rotor assembly, causing the rotor assembly to only Can be drawn out from the direction of the impeller, while the current rotor locking device is installed at the impeller end of the shielded main pump

Images