Normal afterheat discharging pump for third-generation AP1000 advanced pressurized water reactor nuclear power station

Abstract

The invention relates to a normal afterheat discharging pump applicable to an advanced pressurized water reactor nuclear power station adopting third-generation AP1000. Major components of the normal afterheat discharging pump for a third-generation AP1000 advanced pressurized water reactor nuclear power station comprise a press-out chamber cover plate, an impeller, a pump body, a press-out chamber, a pump cover, a throat bushing, a sealing component, a bearing forced cooling structure and a shaft coupler, wherein the throat bushing is arranged on a pump shaft, and the upper part of a bearing component is provided with the bearing forced cooling structure. The normal afterheat discharging pump provided by the invention has the characteristics that the structure is simple, safe and reliable, the efficiency is high, the integral anti-seismic performance is good, and the maintenance is convenient and fast; the requirements of high-temperature, high-voltage and severe radiation environment of power plants and strong seismic oscillation can be met.

Description

technical field [0001] The invention relates to a vertical cantilever pump, in particular to a normal residual heat removal pump suitable for a power plant adopting AP1000 nuclear power technology. Background technique [0002] The normal waste heat export pump in the power plant using AP1000 nuclear power technology is one of the important equipment in the normal waste heat export system of this type of nuclear power plant. The aforementioned normal waste heat removal pump is a nuclear safety three-level pump, located in the auxiliary building of the power plant, and performs the function of removing waste heat in the reactor coolant system during the normal shutdown of the power plant, and plays an important role in the safe operation of a class of power plants using AP1000 nuclear power technology. [0003] At present, there are deficiencies in the technology of ordinary water pumps in China: [0004] First: Under high-pressure working conditions, the mechanical seal of...

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Problems solved by technology

[0004] First: Under high-pressure working conditions, the mechanical seal of the pump is damaged, which cannot meet the leakage rate requirements of nuclear power plants;

[0005] Second: In the operating environment under high temperature and thermal conditions, the stable and reliable long-term operation of the bearing cannot be guaranteed;

[0006] Third: In the harsh irradiation environment, the integrity of the pressure boundary cannot be guaranteed;

[0007] Fourth: The pump body and motor need to be disassembled when maintaining the bearing components, which cannot meet the requirements of regular and rapid maintenance and replacement of parts

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