A main pump maintenance method

Abstract

The invention relates to a maintenance method for a main pump, which can be used in the maintenance of the main pump of a nuclear power plant. The overflow valve on the connected downstream pipeline; connect the shaft seal water pipeline with the shaft seal water connection pipe on the main pump, and the shaft seal water connection pipe is connected with the seal chamber in the main pump; monitor and The water level of the primary circuit connected to the main pump is judged whether the water level of the primary circuit reaches the first set value, and if so, the shaft seal water pipeline is connected to the seal chamber of the main pump The shaft seal water is put into operation to prevent the water of the first circuit in the main pump from entering the seal chamber of the main pump, and prevent the impurities of the first circuit from entering the seal chamber; if not, keep the shaft seal water pipeline in a shutdown state. The maintenance method of the main pump can optimize the maintenance period of the main pump during the overhaul, reduce human error, and save maintenance costs.

Description

Technical field [0001] The present invention relates to the main pump overhaul field, more particularly, to a main pump overhaul method. Background [0002] The maintenance cycle of the main pump group is divided into annual maintenance, three years of maintenance, nine years of maintenance, the maintenance cycle is different corresponding to the maintenance content is also different, the main pump annual maintenance content mainly includes checking the leakage of the seal and each connection flange, checking the No. 3 seal injection water filter, checking the main flange and the sealing chamber bolts, etc. [0003] The annual inspection of the main pump is a routine work of major repair, the traditional process is before the overhaul, the main pump needs to lift the shaft, the seat to control the first circuit medium, because the lower inner side of the pump shaft and the hot screen flange is designed into a shape like the valve spool and the valve seat of the throttling sealing...

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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