Research On The Effect Of Radionuclides On The Regional Surface Water Resources In Severe Nuclear Accidentse

Nuclear power is a high-quality,high-efficiency,low-carbon and environment friendly energy.It is an important means to improve air quality and protect the environment.It also plays an important role in optimizing the industrial structure and promoting regional economic development.Moreover,China proposed in the"Thirteenth Five-Year Plan" that China will develop nuclear power safely and deeply carry out research and demonstration and preliminary preparation work of inland nuclear power.Therefore,the development of nuclear energy will become the general direction of China's energy development.However,we can learn from the history of the development of nuclear power,serious accidents(such as the Chernobyl nuclear accident,the Sanrishima nuclear accident,and the Fukushima nuclear accident)caused significant pollution of the surface water resources in the region.At present,the preselected sites for inland nuclear power plants in China are all located in the riverside area.These river basins are mostly areas with relatively developed economy and relatively high population density.Some rivers are also important sources of drinking water for downstream urban residents.After the nuclear power accident,the safety of the regional surface water resources will be greatly threatened.In summary,studying the degree of influence of radionuclides on surface water in time and space is of great significance to the development of nuclear power.This paper takes the Hunan Taohuajiang Nuclear Power Station as the research object,according to the two-dimensional shallow water equation and the principle of convection and diffusion,adopts the finite volume method to simulate the influence of radionuclides on surface water under severe accidents of the Taohua River.The main research content is as follows:(1)Study a large number of relevant documents,collect and analyze engineering data,and analyze the way that radioactive material enters the regional surface water body when a serious nuclear power accident occurs,determine the radionuclides studied in this paper,and the concentrations of radionuclides that enter the surface water bodies in different ways.(2)Hydrodynamic numerical simulation analysis of the main flow of water from the downstream of the site to the inlet of Dongting Lake.Access to data Analysis of hydrogeological data in the study area,determination of the scope of simulation,terrain conditions,model parameters,and the use of MIKE21 to establish a two-dimensional hydrodynamic model of the downstream water flow in the plant site,and simulate the discharge process line the water level process line at the Taojiang hydrological station and the Yiyang hydrological station.and verify the reliability of the model,provided the basic basis for establishing the two-dimensional hydrodynamic-water quality coupling model of surface water.(3)Study on the temporal and spatial distribution of radionuclides in the regional surface water migration.Taking the Hunan Taohuajiang Nuclear Power Plant as the research object,four working conditions including direct entry into the water source and atmospheric dry and wet deposition were designed.The typical nuclide was 131I,134Cs,136Cs,137Cs,89Sr,and 90Sr.Study on the migration law of nuclides in surface water.Based on the above research results,propose the water resources protection response measures suitable for China.