Method for overhauling main pump

Abstract

The invention relates to a method for overhauling a main pump. The method can be used for overhauling the main pump of a nuclear power station and comprises the following steps that a motor shaft in the main pump and a main shaft of the main pump are kept in a coupling and non-seating state, and an overflow valve on a downstream pipeline connected with a sealing chamber in the main pump is closed; a shaft seal water pipeline is connected with a shaft seal water connecting pipe on the main pump, and the shaft seal water connecting pipe is connected with the sealing chamber in the main pump; the water level of a first loop connected with the main pump is monitored, whether the water level of the first loop reaches a first set value or not is judged, if yes, the shaft seal water pipeline is connected, and shaft seal water is delivered into the sealing chamber of the main pump through the shaft seal water pipeline so as to prevent water of the first loop in the main pump from entering the sealing chamber of the main pump, and impurities of the first loop are prevented from entering the sealing chamber; and if not, the shaft seal water pipeline is kept in a shutdown state. According to the method for overhauling the main pump, the main pump overhauling period in the overhaul period can be optimized, meanwhile, manual deviation is reduced, and the maintenance cost is saved.

Description

technical field [0001] The invention relates to the field of maintenance of main pumps, and more specifically relates to a method for maintenance of main pumps. Background technique [0002] The maintenance cycle of the main pump and pump unit is divided into annual maintenance, three-year maintenance, and nine-year maintenance. Seal the water filter, check the main flange and seal chamber bolts, etc. [0003] The annual inspection of the main pump is a routine work for overhaul. The traditional process is that before the overhaul, the main pump needs to be lifted and seated to control the medium of the primary circuit. Because the inner side of the lower part of the pump shaft and the heat shield flange is designed in a shape like a valve core and a valve The throttling and sealing structure of the seat is similar to the function of a valve. When the short shaft is removed and the pump is separated from the motor (at this time, the primary circuit has been depressurized), ...

AI Technical Summary

Problems solved by technology

[0005] During the loosening and connecting process of the back wheel of the main pump, MPP personnel need to contact each interface unit in advance, and be responsible for the loosening and connection of the back wheel after confirming that each state meets the work requirements. In addition, operate RCV073 / 074 / 075VP, RCP616 / 626 / 636VP, RPE083 / 084 / 085VP valves (the doses of these three valves are high), the process of seating and lifting the three main pumps requires disassembly and assembly of 36 bolts with a torque of 1380N.

During the whole process, there may be many incidents where the shaft seal water cannot be put into operation, causing personnel to wait in the nuclear island for a long time. In addition, there may be incidents where the water level of the primary circuit drops due to personnel deviation.

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