CNP1000轴封式核主泵技术

CNP1000轴封式核主泵作为泵类行业的高端设备是核电站一回路系统中唯一没有实现国产化的设备,其自主设计、制造及试验是我国推进核电自主化的重点和难点.对核电泵的国内技术现状以及1 000 MW轴封式核主泵结构特点进行了介绍,分别从承压边界、水力部件、转子轴系、隔热组件、轴密封、停车密封、水导轴承、推力轴承、一体化供油泵、油密封、辅助系统及其关键设备进行了设计原理和实施要求的详细说明.通过对不同类型主泵的出口限制情况和应用前景比较分析,说明了轴封主泵对外出口的优势,提出轴封主泵将在很长一段时间占据核电市场的主导地位.目前国内企业已完成了多项关键技术,如主轴密封、水力部件、全流量试验等的自主化,但是核主泵的理论基础并没有完整建立,有待进一步研究.因此,核主泵的国产化研制任务仍需较长的时间去攻克.

Technology for 1 000 MW shaft sealed reactor coolant pump

As high-end equipment in pump industry, CNP1000 shaft sealed reactor coolant pump(RCP)in the primary loop system of pressurized water reactor(PWR)in a nuclear power plant is the only equipment which cannot be manufactured domestically. Therefore, the independent design, manufacturing and test of this kind of pump are important and difficult tasks in promoting the nationalization of nuclear technology in China. In the paper, the domestic technological situation and structural characteristics of 1 000 MW shaft sealed RCP are introduced briefly, and the design principle and technical implementation requirement are elaborated in terms of pressure retaining boundary, hydraulic components, pump rotor system, heat insulation subassembly, shaft seal, standstill seal, lower guide bearings, thrust bearing, integrated oil pump, oil seal, auxiliary system and key equipment in detail. Through an analysis on export restriction and application prospect of various types of RCP, it is shown that shaft sealed RCP has more strength in export and will occupy a dominant position in the nuclear equipment market for a long time. Presently, several key technologies, such as shaft seal, hydraulic components, full-load test and so on have been nationalized in a few domestic factories, but the theoretical principle of RCP is still not well established and needs to be explored further. Hence, as an important mission, the nationalization of RCP still requires a long time to be tackled.