用過核子燃料乾式貯存設施(A dry storage cask for spent nuclear fuel)係利用空氣對流方式進行散熱，本研究為討論在自然環境中，風速及風向對貯存設施散熱性能之影響，為此進行風洞實驗，並且將其結果再與熱流分析軟體進行計算流體動力學(Computational Fluid Dynamics, CFD)分析比對，輔助說明風洞實驗結果。以混凝土護箱與密封鋼桶間之風速及溫度變化檢討貯存設施之散熱性能，無風速時，貯存設施以熱浮力進行散熱，當風速逐漸增加，內部溫度隨之下降，顯示散熱性能提升。風向影響氣流進入流道之效率，同風速情況下，風向與氣口角度大，貯存設施散熱性效果較差。風速與風向二者皆為貯存設施散熱性能之因素，前者影響力較大。

The dry storage cask cooling by air circulation.In this study, we discuss different the wind speeds and the wind direction affects heat dissipation performance of a dry storage cask when the dry storage cask for spent nuclear fuel , which used NAC- MAGNASTOR cask of system, and placed outdoors. We test the cask in a wind tunnel to get the wind speed and temperature in the flow channel of the cask.Then compare the experimental data with the result from a commercial software PHOENICS CFD (Computational Fluid Dynamics) for heat flow analysis. The temperature of channel drops accordingly when the wind speed was much faster,indicating improved heat dissipation performance. The wind direction affects the efficiency of the airflow entering the channel. At the same wind speed, the angle between the wind direction and the air port is larger, and the heat dissipation effect of the storage facility is poor. Both the wind speed and the wind direction are the coefficients of the heat dissipation performance of the storage facility, and the former is more stronger influence.

[1]台灣電力公司-核能後端營運專屬網站, "核二廠乾式貯存計畫."
[2]H. Y. Chang, R. H. Chen, and C. M. Lai, "Numerical Simulation of the Thermal Performance of a Dry Storage Cask for Spent Nuclear Fuel," Energies, vol. 11, p. 149, 2018.
[3]A. Remache, Y. Addad, A. Sabeur-Bendehina, and A. Ouadha, "Thermal design optimization of passive cooling capability in a dry-storage system by adding wall undulations or semi-circular fins," Nuclear Engineering and Design, vol. 347, pp. 140-150, 2019.
[4]H. Takeda, M. Wataru, K. Shirai, and T. Saegusa, "Heat removal verification tests using concrete casks under normal condition," Nuclear Engineering and Design, vol. 238, pp. 1196–1205, 2008.
[5]K.-S. Seo, K.-S. Bang, S.-H. Yu, J.-C. Lee, and W.-S. Choi, "Experimental study on heat-removal performance in accordance with mesh size of screen installed at opening of inlets and outlets of concrete storage cask," Annals of Nuclear Energy, vol. 112, pp. 322-327, 2018.
[6]G. U. Kang, D. S. Yook, and J. H. Cha, "A CFD analysis of thermal behavior in passive heat removal system of dry storage cask under different conditions."
[7]X. Heng, G. Zuying, and Z. Zhiwei, "A numerical investigation of natural convection heat transfer in horizontal spent-fuel storage cask," Nuclear engineering and design, vol. 213, no. 1, pp. 59-65, 2002.
[8]H. M. Kim, H. C. No, K. S. Bang, K. S. Seo, and S. H. Lee, "Development of scaling laws of heat removal and CFD assessment in concrete cask air path," Nuclear Engineering and Design, vol. 278, pp. 7-16, 2014.
[9]台灣電力公司, "第二核能發電廠乾貯計畫安全分析," Dec,2011.
[10]內政部建築研究所風與風洞實驗室, "風洞實驗室設備," Mar.2020.