AP1000屏蔽式主泵维修可行性分析

Abstract

核电厂反应堆冷却剂泵是核安全一级设备，其运行的可靠性直接关系到电厂核安全、辐射安全及经济性，对防止核电厂事故的发生和发展极为重要，并且发生故障主泵的解体检修可能是核电厂大修期间的重要工作之一。AP1000反应堆主泵采用单级离心飞轮带屏蔽电机的屏蔽泵，目前国内外没有原型泵可供参考，以及较少运行经验，开展AP1000主泵维修可行性研究对核电厂商运后的安全和经济性具有重要意义。分析了主泵寿命期内故障和失效原因；从现场拆卸，吊装，去污，解体，检修和部件更换以及回装试验等方面分析判断AP1000屏蔽式主泵在60年设计寿命期内维修的必要性和可行性。The nuclear power plant reactor coolant pump is the first class nuclear safety equipment. The operation reliability is directly related to power plant nuclear safety, radiation safety and economy, the operation reliability is also vital to prevent the occurrence and development of nuclear power plants accident. The overhaul of the failure main coolant pump may be one of the important tasks during the overhaul period. AP1000 reactor main pump is a unipolar, centrifugal canned motor pump with flywheel and canned motor. There is no prototype pump and less operation experience for reference at domestic and abroad. The feasibility study of repairing the AP1000 reactor coolant pump is significant for the safety and economy of nuclear power plant after commercial operation. The main pump failure case during the life of pump is analyzed. The maintenance necessity and feasibility about AP1000 canned main pump over the 60-year design life are analyzed from the aspects of removal, lifting, decontamination, disassembling, maintenance, component replacement and assembly test.