反应堆主泵径向止推轴承水润滑回路自主改造创新

田湾核电站一期工程两台机组1391M型反应堆主泵径向止推轴承采用水润滑方式,是在世界大型商用压水堆中首次应用。由于原型设计存在缺陷,导致了一系列运行事件。江苏核电有限公司针对设计缺陷进行了自主技术改造创新,成功降低了主泵径向止推轴承释热率,缓解或避免了轴瓦的＂空化＂磨损,改善了径向止推轴承冷却效果。文章对主泵径向止推轴承水润滑回路的改造原因、改造设计方案与实施准备、实施情况与改造效果评价、后续工作计划等方面进行了详细的介绍。

Independent Modification on Water Lubrication Loop of Radial-axial Bearings of Russian Reactor Coolant Pump

Water lubrication was used for radial-axial bearings of 1391M reactor coolant pumps at both units of Tianwan Nuclear Power Plant Phase I Project,which was the first trial on large commercial pressurized water reactors in the world.As a prototype,there were inherent deficiencies leading to a series of operational events.Jiangsu Nuclear Power Corporation conducted the independent innovative technical modification to cope with the defects,and succeeded in reducing heat removal rate of the radial-axial bearings of the reactor coolant pumps,mitigating or preventing the cavitation abrasion of the bearings and improving the cooling effects.This paper illustrates the reasons of the innovative modification,the design and implementation preparation of modification program,the implementation process and evaluation of modification effects,including detailed follow-up work program.