机械通风冷却塔雾羽扩散是内陆核电厂重要厂用水系统环境影响评价时首要考虑的重要问题，直接影响核电厂机械通风冷却塔附近大气环境。以江西彭泽和吉林靖宇内陆核电厂址为研究对象，应用冷却塔环境影响评价模型SACTI 模拟预测不同厂址、不同冷却塔设计和不同布局方案情景下机械通风冷却塔雾羽扩散特征，以确定不同厂址环境特征和冷却塔设计可能对机械通风冷却塔雾羽扩散产生的影响。结果表明，不同机械通风冷却塔设计情景下，一机四塔比一机两塔方案引起的雾羽扩散环境影响范围广，雾羽长度范围后者约为前者的2.1 倍，雾羽高度范围后者约为前者的1.3 倍。不同冷却塔布局方案情景下，一机两塔情景下线性排列和平行排列方案主要影响近场雾羽长度分布和高处雾羽高度分布，一机四塔情景下两种排列方案主要影响远场雾羽长度分布和低处雾羽高度分布。不同厂址情景下，一机两塔方案2 个厂址雾羽扩散差异最大，一机四塔方案2 个厂址雾羽扩散差异最小。
The plume dispersion from mechanical ventilation cooling towers is an important issue in the environmental assessment of the essential service water system of an inland nuclear power plant, which affects the atmosphere environment around the mechanical ventilation cooling tower. Taking the nuclear power plant sites in Pengze, Jiangxi and Jingyu, Jilin as examples, this study simulates the plume dispersion from the mechanical ventilation cooling tower in different sites, for different cooling tower designs and in different layout scenarios by applying the SACTI model. The effects of different site environmental characteristics and different layouts on the plume dispersion are determined. It is shown that among different design scenarios of the mechanical ventilation cooling tower, the environment impact region of the plume dispersion for the case of four towers is larger than that for the case of two towers. the plume length of the former is 2.1 times of that of the latter and the plume height of the former is 1.3 times of that of the latter. Among different layout scenarios of the cooling tower, the linear layout and the parallel layout for the case of two towers mainly impact the distributions of the near field plume length and the high plume height. However, they impact the distributions of the far field plume length and the low plume height for the case of four towers. Among different nuclear power plant sites, the difference between the two sites is the largest for the case of two towers and it is the least for the case of four towers.
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