In order to study the transient characteristics of a nuclear reactor coolant pump in coast-down process under power failure condition, a transient test device for the nuclear reactor coolant pump is set up. This study investigates the effects of the rotor of the nuclear reactor coolant pump and the circuit characteristics on the nuclear reactor coolant pump during the coast-down process by changing the rotary inertia of the flywheel and the resistance of the pipe system. The results show that the greater the moment of inertia is, the more slowly rotational speed, flow, and lift get down in the same coast-down period. The change in the pipe resistance has little effect on the rate of decline in the coast-down process, but it has a great influence on the descent speed of the flow rate and lift. When the pipe resistance is small, the corresponding flow rate decreases faster, but it is slower for the corresponding lift. The results are of great significance in controlling the stability and reliability of the nuclear reactor coolant pump in the coast-down process.

为了研究停电条件下滑行过程中核反应堆冷却剂泵的瞬态特性，建立了核反应堆冷却剂泵的瞬态测试装置。本研究通过改变飞轮的旋转惯性和管道系统的阻力，研究了滑行降落过程中核反应堆冷却剂泵转子和回路特性对核反应堆冷却剂泵的影响。结果表明，惯性矩越大，在相同的滑行时间内，转速，流量和升力下降的速度就越慢。管道阻力的变化对滑行下降过程的下降速度影响很小，但对流速和升力的下降速度影响很大。当管道阻力小时，相应的流速下降得更快，但相应的升程则下降得更慢。该结果对于控制滑行过程中核反应堆冷却剂泵的稳定性和可靠性具有重要意义。