2D And 3D Numerical Simulation Low-Level Radioactive Wastewater And Pollution Analysis

With the rapid development of our country's economy,the demand for electric energy is becoming more and more intense.Electric energy has become an indispensable energy base for people's social life.Nuclear power as a very promising way of generating,it has the characteristics of unlimited resources,clean,environmentally friendly,efficient and so on.But at the same time,emission of low-level waste water has also been a concern both at home and abroad.Therefore,it can provide a theoretical basis for the site selection of the nuclear facilities outfalls and protection of the marine ecological environment to understand the migration and distribution of the low-level radioactive waste water discharged from the nuclear facilities.For the traditional two-dimensional numerical simulation of low-level radioactive wastewater,the calculation method neglects the distribution of radionuclides in the vertical direction and can't truly simulate the concentration field distribution of radionuclides.It has some limitations.Compared to 2D numerical simulation,3D numerical simulation is more accurate in dealing with complex terrain and boundary problems.The calculation takes into account the movement of low-level radioactive waste water in the horizontal and vertical direction,and more in line with the actual discharge conditions,so that the concentration distribution of radionuclides is more accurately expressed.Aiming at these problems,the paper take a certain coastal nuclear power plant as an example to select the mesoscale sea area as a 2D calculation sea area and the top sea area of the Beibu Gulf as a three-dimensional sea area.Firstly,the terrain,coastline,ocean hydrological characteristics and surrounding environment sensitive targets of the study area and ambient sensitive target are analyzed and summarized.Firstly,the paper analyzes and summarizes the terrain,shoreline,oceanic hydrological characteristics and the surrounding environment sensitive target of the study area.It also describes the impact of low-level radioactive waste water on the marine environment and human health,as well as and the relevant standards and norms formulated by the State for the discharge of low-level radioactive wastewater.Secondly,the paper adopts the method of numerical simulation to establish 2D and 3D hydrodynamic mathematical models by the MIKE21/3.The model is validated well and the tidal current field in the study area was analyzed.The 2D and 3D numerical simulation of radionuclide-tritium were carried out by using radionuclide-tritium as the research object of low-level radioactive wastewater.The 3D mathematical model can simulate the discharge of low-level radioactive waste water by comparing the concentration field distribution of 2D and 3D low-level radioactive wastewater.And it is assumed that the emission source,the analysis of the 2D,3D calculation results have no effect on environmentally sensitive targets.At last,the paper provides a theoretical basis for the site selection and emission plans of the discharge ports of nuclear power facilities,and also provides guidance for the management and detection of low-level radioactive waste water discharge after the normal operation of nuclear power facilities.