华龙一号某机组主泵推力轴承优化改进分析

华龙一号某机组三轴承结构设计的主冷却剂泵（简称主泵）在进行小流量试验时，出现推力轴承磨损问题，通过对主泵推力轴承结构进行分析，利用鱼骨图根本原因分析方法，对导致推力轴承磨损的可能原因进行逐一排查分析，根据排查结果，提出采用多喷嘴联合供油设计、在主推力轴承和副推力轴承的油膜吸入口处增加吸油倒角设计、在原有顶轴油设计基础上增加反向副推力轴承顶轴油结构设计、建立推力轴承温度-油温的综合测量系统及采用弹簧板主动补偿式推力轴承支撑结构等改进方法。经试验验证，改进后的主泵推力轴承系统显著提升了华龙一号某机组主泵的运行可靠性和固有安全性。 

Analysis of Reactor Coolant Pump Thrust Bearing Modification of an HPR1000 Unit

The abnormal thrust bearing abrasion was found during the small flow test of the reactor coolant pump (RCP) of three-bearing structure design for an HPR1000 unit. After analyzing the RCP thrust bearing structure, the authors identify and analyze all the possible causes for this abrasion in the root cause analysis method based on fishbone diagram. According to the identification and analysis results, the authors proposing such modifications as using the oil supply of multi-nozzle design, adding oil suction chamfer at the oil film suction ports of the main and auxiliary thrust bearings, adding jacking oil structure design for reverse auxiliary thrust bearing to the original jacking oil design, build an integrated measurement system for thrust bearing temperature-oil temperature, and supporting the structure by spring plate actively compensated thrust bearing. As verified by tests, the improved RCP thrust bearing system helps enhance significantly the RCP operation reliability and inherent safety of the HPR1000 unit.