Analysis Of Liquid Effluents Discharge Plan Of One Inland Nuclear Power Plant (NPP) In The Northern Areas

Nuclear power plant site selection should be subordinated to the national energy development plan.The nuclear power plant should select the site with high safety and small environmental impact.But the site resources available to meet these requirements are limited.Therefore,the location and construction of nuclear power plants need to be carried out in the area that better in other environmental conditions,but the dilution condition of the receiving water is poor,or the area that liquid effluents is forbidden to be discharged into the receiving water because of the requirement of water environment management.For the nuclear power plant which receiving water low dilution or no receiving water body,belongs to the special type of the discharge management of liquid effluents.In the current regulations and standards,there is no specific stipulation about how to deal with the liquid effluents and emission management at such sites.Therefore,how to discharge the liquid effluent from the nuclear power plant becomes a "bottleneck" in the establishment of such a nuclear plant site.According to the environmental characteristics of the northern inland NPP and the practical experience of liquid discharge from nuclear power plant at home and abroad,puts forward a liquid effluent discharged into nearby rivers,emissions to nearby waters into a gaseous and liquid effluents discharge of three kinds of solution.The compatibility between emission scheme andregulations was analyzed in accordance with national standards.Compared with the hydrologic data of the river near the site and the calculated minimum river flow required for liquid effluent discharge,the feasibility of discharge scheme to nearby rivers was negated.Combined with the geographical conditions of the site,the liquid effluent is transported to the coastal discharge station by pipeline transport and tanker transport,and then discharged offshore.The Marine area to be discharged was selected according to the Marine function zoning.Two pipeline routes along the river were chosen,two projects of direct buried pipeline and overhead pipeline were designed,and the project investment was estimated.Two methods which is air-cooling tower and natural evaporation tank were proposed to realize the gaseous discharge of liquid effluent.The feasibility of using air-cooling tower to convert liquid to gas was analyzed,the situation of atomizing nozzle was investigated,the preliminary engineering design and economic analysis were carried out,and the preliminary environmental impact assessment was carried out.The preliminary engineering design and economic analysis of the natural evaporation pool scheme were carried out,and the preliminary environmental impact assessment was carried out.The scheme of using air-cooling tower to convert liquid effluent into gas emission is superior to other schemes according to the comprehensive comparison.But it needs the relevant departments of the national sector to revise relevant standards and clarify specific requirements.This study solves the problem of liquid effluent discharge at candidate nuclear power plant sites and provides a reference solution for similar environmental conditions in inland nuclear power plant sites.