Impact of large natural draft cooling tower on atmospheric dispersion of airborne effluent from nuclear power plant
WANG Xuan1,2, DU Feng-lei1, WANG De-zhong2, WANG Yi-chuan3, WANG Bo3
1. Shanghai Nuclear Engineering Research and Design Institute CO., LTD, Shanghai 200233, China; 2. Shanghai Jiaotong University, Shanghai 200240, China; 3. Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082, China
Abstract：To calculate the impact of large cooling towers and their wet heated plume on the atmospheric dispersion of airborne effluent, the impact simulation of a single cooling tower was conducted under operation and shut down conditions. The atmospheric dispersion of airborne effluent from different release heights at different relative locations was calculated by the k-ε model, and supported by a computational fluid dynamics model, STAR-CCM+. The results showed that when the release point was at a height of 10m and located on the windward side of a shut down cooling tower, the ground centerline dispersion factors downwind generally decreased to 1/3~1/2 compared with those in the absence of the cooling tower. In addition, when the release point was at a height of 75m, and located on the windward side of an operating cooling tower, the dispersion factors generally increased 1~2 times compared with those in the absence of the cooling tower. However, if the release point located on the leeward side of an operating cooling tower, the dispersion factors generally decreased to 1/2 compared with those in the absence of the cooling tower. When the cooling tower was shut down, the dispersion factors of 75m release height were higher than those without the cooling tower, regardless of the release point location was on the windward side or leeward side of the cooling tower. Compared with a shut down cooling tower, when the release point was at a height of 150m, and located on the windward side of an operating cooling tower, the wet heated plume increased the dispersion factors within approximately 800m downwind, but at the distance beyond 800m, the dispersion factors began to decrease.
王炫, 杜风雷, 王德忠, 王一川, 王博. 核电厂大型自然通风冷却塔对气载流出物扩散的影响[J]. 中国环境科学, 2018, 38(5): 1695-1703.
WANG Xuan, DU Feng-lei, WANG De-zhong, WANG Yi-chuan, WANG Bo. Impact of large natural draft cooling tower on atmospheric dispersion of airborne effluent from nuclear power plant. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1695-1703.
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