Study On Some Issues Of Environmental Function Zone In The Offshore Area Of Nuclear Power Plants

Nuclear power generation releads the tendency of energy development because of its efficiency and other advantages. Conforming to the global trend, China has changed the nuclear power development policy from moderate development to active development. All the nuclear power plants of our country are located in coastal areas at present. The construction of seaside nuclear power stations has brought some issues of environmental function zone in the offshore area. Some topics were discussed here in order to cause widespread concern and in-depth academic study. The theoretical research contributes to the solution of problems in the practice and the improvement of management of marine environment.The thesis focuses on the four main issues of environmental function zone in the offshore area of nuclear power plant. The following contents and conclusions are included in this paper.The history of China's nuclear power industry, the current situation and tendency are summarized. The main pollutants discharged into the sea and their effects are analysed. The management status of environmental function zone are investigated. Based on these, four issues are proposed:the time-delay of zoning, the technical issue of zoning, the ecological perspective of radionuclides, the ragulation of the environmental function zone.The forecasting methods of nuclear power pollutants are introduced. Based on the results of flow velocity and turbulent flow, the two-dimensional and three-dimensional mathematical model is theoretically compared, and verified by a practical case. In two-dimensional mathematical modeling, surface velocity results is smaller for it's depth-averaged,and simulation accuracy is lower for ignoring the uneven distribution of velocity and turbulent mixing process. Therefore, three-dimensional model is recommended in the prediction of nuclear power plant pollutionThe environmental media concentration limits of radionuclides are calculated from the cumulative effect and the view of marine environmental risk caused by ionizing radiation. Learning from the EU's research results, and the theoretical logic of ERICA integrated method is derived backwards. Thirteen categories of marine biology are selected as reference organisms. The important parameter datas are provided by ERICA Tool database. Finally, the water and sediment's environmental media concentration limits of 63 artificial radionuclides are calculated.The framework of adjustment of environmental function zone in the offshore area is put forward, including the principle, basis, process, purpose of each stage, standards and methods. The basic and special information of investigation are proposed, together with the assessment criteria and method. The research result is applied to a adjustment case of the environmental function zone in the offshore area of a nuclear power plant.Finally, the monitoring and management issues are discussed. The monitoring content is analysed. The monitoring program and suggestions on informalization management are put forward. It's necessary to establish the monitoring system.