内陆核电站低放射性废水排放的三维计算

本研究应用EFDC三维水动力学数学模型,对典型受纳水体富水水库中核电站的低放射性废水排放进行了数值计算。富水水库库容较大、水体较深、水面窄长。先对由排放引起的水库内浓度场的稳定过程和稳定时间进行了预备计算,之后对表层排放、底层排放两种不同的排放方案进行了计算与分析,给出了表、底层排放核素分布的三维结构。模拟结果表明:污染物在环境水域中的运动规律,主要由环境流场决定。水库水深大,水体的稀释能力较强,且有向流速大的水层输移的趋势;不同半衰期物质,其浓度分布因水流输运作用与自衰作用的影响程度不一,同样条件下,半衰期长的核素浓度线包络面积也较大。

Three_dimensional modeling of radionuclide effluent flow in reservoir for nuclear power station

The 3-D hydrodynamic mathematical model EFDC is applied to numerically calculate the flow of radionuclide effluent discharged from a nuclear power station into a reservoir.The long and narrow reservoir has the depth more than 10m.The stabilized process of radionuclide concentration field and time needed for achieving stable are calculated.On this basis,the 3-D concentration distributions in the reservoir for outlets located at surface layer and bottom are calculated respectively for scheme selection.The simulation result shows that the movement of pollutant is determined by the flow field of the reservoir.Since the depth is relatively large,the water in reservoir has enough capacity to dilute the pollution,and the transportation of pollutant tends to high velocity flow layer.The distribution of pollutant is affected by the flow and the half-life period of the radionuclide.