Background: In engineering application of steam generator (SG) for nuclear power plant (NPP), two limitations are imposed on the design of water tanks. One is that the water collected in the water tank cannot spill over to avoid the entrainment of water from the water tank. The other is that the size of the devices used in the SG is limited by the safety consideration and costs. Purpose: This study aims at the drainage performance of drain device in steam generator of CAP1400 to provide reliable data for the design of a drain device. Methods: The drainage performance of drain device in steam generator of CAP1400 was simulated through an experimental method with water and air under ambient temperature and pressure. A video camera is used to record liquid level at certain water flow rates range of 13.8−138.1 m3·h−1, and the recorded video images are processed by MATLAB program. Results:The experimental results show that the maximum water depth level in drain tank linearly increases with the water flow rate while the number of water entrance holes has no obvious effect on the drainage performance of drain device and the value of bottom surface slope angle has a little influence on it. Conclusion: Using a slope bottom plate can help draining water to some extent and the number of orifices has little effect on the liquid level of drain water tank.%采用常温常压的空气和水，通过实验模拟研究了核电站 CAP1400机组蒸汽发生器中疏水槽的疏水特性。实验中设计了不同倾角的疏水槽底板(3.5°−5°)，并设置了不同的疏水入水孔数(36−136个)，通过控制进入疏水槽的疏水流量(13.8−138.1 m3·h−1)，研究不同底板倾角以及不同疏水入水孔数对疏水槽的疏水能力的影响。采用摄像仪对不同工况下疏水槽的水位进行记录，通过 MATLAB 图像处理的方法对疏水槽水位进行识别，提取出水位高度数据用于实验分析。实验结果表明，疏水槽中最大液位高度随流量呈线性升高；疏水槽入水孔数量对于疏水槽内最大液位高度的影响不明显；疏水槽底面倾角对于疏水能力的影响较小。
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