Advanced Reactor Passive Emergency Core Cooling System Stratified Flow Experiments and Characterization of Condensation Induced Water Hammer

摘要

Condensation Induced Water Hammer (CIWH) event was observed during stratified flow experiments. The level of water plays important role in occurrence of water hammer. When level of water is below center of test section, water hammer event occurs at high flow rates. However, when water level reached above the center of test section, water hammer occurs at relatively low flow rates. An envelope of flow conditions to mitigate can be created based on data obtained from experiments. The effect of test section temperature is also crucial in occurrence of water hammer. At cold test section temperature, water hammer was not observed. It can be implied that steam condenses more on test section than cold water at lower test section temperature and hence mechanism necessary to form waves and bridging was not present.