核电站低放射性废水在封闭水体中的输移规律研究

采用EFDC水动力-水质模型对咸宁核电站低放射性废水在封闭型水体富水水库中的输移过程进行了数值模拟,重点分析了富水水库在不利来水条件下(97%保证率),4台机组同时运行时,低放射性废水中6种不同半衰期核素在水库中的浓度分布情况.结果表明,低放射性废水浓度的分布主要受水库流场分布的影响,浓度变化主要受核素半衰期及来水量多寡的影响;同时,随着核素半衰期的延长,低放射性废水在水库中的影响范围逐渐增大,当半衰期延长到5 a以上时,影响范围趋于稳定;此外,由于水库流场流向下游的大坝处,排水口的水流很难回流到上游的取水口处,因此取水口处的水质不受下排水口低放射性物质回流的影响.

Transport Processes of Low-level Radioactive Liquid Effluent of Nuclear Power Station in Closed Water Body

The transport processes of low-level radioactive liquid effluent of Xianning nuclear power station in the closed water body Fushui Reservoir are simulated using the EFDC model. Six nuclides concentration distribution with different half-lives in the reservoir are analyzed under the condition of 97% guarantee rate incoming water and four-running nuclear power units. The results show that the nuclides concentration distribution is mainly affected by the flow field of the reservoir and the concentration is decided by the half-lives of nuclide and the volume of incoming water. In addition, the influence region is enlarged as increasing of half-life and tends to be stable when the half-life is longer than 5 years. Moreover, the waste water discharged from the outlet of the nuclear power plant has no effect on the water-intake for the outlet located at the upstream of the water-intake and the flow field flows to the dam of the reservoir.