冷却塔雾羽扩散直接影响冷却塔周围区域居民生活环境，是内陆核电厂散热系统运行环境影响评价时首要考虑的重要问题。应用冷却塔环境影响评价模型（SACTI），针对不同环境温度和风速变化情景下自然通风冷却塔雾羽特征参数进行模拟，以确定不同季节气象要素变化可能对冷却塔雾羽扩散产生的影响。研究表明，SACTI 模型预测的不同温度条件下雾羽长度发生频率随温度增高呈下降趋势；雾羽高度发生频率随温度下降呈增加趋势、随温度增高呈减少趋势；雾羽半径发生频率随温度变化呈减少趋势。不同风速条件下，雾羽长度发生频率随风速增加呈增加趋势，雾羽高度发生频率随风速增加呈减少趋势，雾羽半径发生频率随风速增加呈减少趋势。冷却塔雾羽受温度和风速影响显著，直接影响不同季节冷却塔雾羽扩散。
Plume dispersion of cooling towers is the most important environment problem in environmental impact assessment of an inland nuclear power plant, which greatly impacts the living environment of the residents around the plant. The SACTI (seasonal/annual cooling tower impact) model is used to simulate the plume characters of natural draft of the cooling tower under different environmental temperature and wind speed scenarios in order to determine the influences of the meteorological factors in different seasons on plume dispersion of the cooling tower. The study shows that under different temperature circumstances, the plume length frequency predicted by the SACTI model decreases with the temperature increase. The plume height frequency displays an ascending trend with the descending temperature and shows the descending trend with the ascending temperature. The plume radius frequency has a decreasing change with temperature change. Under different wind speed scenarios, the plume length frequency increases with the increasing wind speed. The plume height frequency displays a descending change with the ascending wind speed. The plume radius frequency with respect to wind speed has a similar varying trend to that of the plume height frequency. The effects of temperature and wind speed on the cooling tower plume are very remarkable and impact cooling tower plume dispersion in different seasons.
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