核电厂分散式排水口邻近区温升分布试验研究

由于核电厂温排水产生的热污染问题日益突出,环境影响评价不再仅局限于沿水深平均的二维平面温升分布及取水温升,同时要求垂线温升分布符合标准。通过建立温排水正态物理模型试验,研究了某核电厂分散式排水口近区三维温升分布特征,在不同潮位、流速、水深作用条件下,观测了排水口附近表面及垂线温升变化规律。试验结果表明:多点蘑菇头式排水口布置型式在水深条件为15.5 m时能够更好地满足环境影响评价及最小水深要求。计算结果可为核电厂取排水工程设计、海域使用论证提供科学依据。

Experimental research on temperature rise distribution near distributed outfall of nuclear power plant

As thermal pollution of water environment caused by discharge from nuclear power plant become noticeable，environmental impact assessment is not only limited to two-dimension temperature rise distribution, but also it is required that the vertical temperature rise distribution meets the standard. In this paper a thermal discharge normal physical model was built to study the three dimensional temperature rise of distributed outfall of a nuclear power plant. Then the temperature rise changing trend near the outfall structure was observed with various tides, velocities and depths near the outfall. It was concluded that multipoint mushroom shape outfalls with water depth of 15.5m can satisfy the environmental impact assessment and meet the requirements of the minimum water depth. It can provide a scientific basis for outfall structure design and planning of marine utilization.