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A conceptual design in passive cooling andspray enhanced heat removal for spent fuel pool under severe accident threat   HUNG Tzu-chen1, HSIEH Kai-ting2, TSAO Po-chih2, HUNG Michelle3, TSENG Yung-shin4, and CHEN Yitung5   1. Department of Mechanical Engineering, National Taipei University of Technology (NTUT), Taiwan (tchung@ntut.edu.tw)  2. Institute of Mechatronic Engineering, NTUT, Taiwan (g3u04jp6@livemail.tw) 3. Department of Biomedical Engineering, Cornell University, Ithaca, NY, USA (mh2233@cornell.edu) 4. Nuclear Science & Development Center, National Tsing-Hua University, Taiwan (yungshintseng@gmail.com) 5. Department of Mechanical Engineering, University of Nevada, Las Vegas, Nevada, USA (ychen@unlv.nevada.edu)   Abstract: The main purpose of this paper is to elevate the heat removal capability of spent fuel pool (SFP) and its safety for nuclear power plant. This research establishes a small-scaled device to perform numerical simulations and experiments to investigate its behavior after the nuclear accident. Firstly, to discuss if air would be the only medium for heat removal from spent fuel pool with the condition of no water existed. The research methods focus on using the combination of numerical simulation with experiments to explore the thermal-hydraulics phenomenon, and verify the numerical methods through experiments. Therefore, this study establishes a numerical model to perform the change in more difficult geometric parameter, and implement computer simulation to analyze its heat flow behavior. The result shows that the height of backplane, the numbers of aperture on backplane, the location of different watts of bundle rod heater, and the model geometry are the major causes of natural convection effect. In addition, cone spray nozzles were installed in the experimental apparatus to cool the heating rods. The coexistence of spray and natural convection resulted in an average of 5~15% improvement in temperature drop for the rods Keyword: spent fuel pool; natural convection; spray experiments
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