Numerical Simulation On Sea Wind Of A Nuclear Power Station And Study About The Effect Of The Wind-induced Chloride Ions

The design and research of structural wind resistance is an indispensable work in structural design.In our country,there is mature and detailed introduction to the wind resistant design of conventional buildings and structures in the current "load code for the design of building structures".However,the load code does not provide enough design basis due to the complicated architectural form and layout of nuclear power plants,the large scale and serious interference of building complex.Therefore,it is necessary to carry out special research and analysis on the wind load of the conventional island in the nuclear power plant.In China,more and more nuclear power stations are built in the developed coastal areas in order to take advantage of seawater cooling technology for nuclear power generation in coastal area and the infinite dilution capacity of the ocean.But,coastal areas are more susceptible to typhoons,hurricanes,tropical storms,thunderstorms and other harsh winds,so it is really necessary to study and demonstrate the safety of the nuclear power plant under extreme wind load in order to avoid the issue of nuclear security in extreme sea wind environment.And the nuclear power plant would be attacked by large amounts of chloride ions carried by the sea breeze because of the coastal environment and the impact of wind.And the osmosis of chloride ions accumulated on the surface is often the main factor affecting the corrosion of reinforced steel.The safety and durability of the nuclear power plant should be ensured within its life for being the most important structure.In this paper,Numerical simulation on sea wind of a nuclear power station in Guangdong was carried out by the method of CFD based on the software platform of Fluent.The safety of the conventional island of the nuclear power station was demonstrated by analyzing the influence of wind load.And the discrete phase model was used to simulate the tracks of the wind-induced chloride ions to offer guidance for sampling of chlorine ions content in concrete of the nuclear power station.To study the durability of the containment vessel and conventional island plant of the nuclear power station,the corrosive action of the adhered chloride ions was analyzed.It was proved that the design of the nuclear power station was safe under the action of wind load.And to a certain extent,it could be judged that there been more chloride ions accumulated there.It could be judged by the sampling inspection and analysis of the content of chloride ions,the thickness of cover to reinforced steels,the permeability and the chloride diffusion of concrete: The content of chloride ions was within the limit of safety permits;The thickness of cover to reinforced steels met the standard and design requirements;The concrete had good impermeability and compactibility;The chloride ions permeability of concrete was relatively low,which satisfied the impermeability requirement of high performance concrete.It could be predicted by the analysis of chloride ions diffusion model that the content of chloride ions concentration on the surface of reinforced steels in concrete of the nuclear power station was much lower than the corrosion "Threshold Value" of reinforced steels in the structural service life(50 years).And it was found that the content of chloride ions would be below 0.04% in 100 years,which was still under the corrosion "Threshold Value" of reinforced steels.To a certain extent,all the analyses ensured the durability of the nuclear power plants.