The Anti-seismic Numerical Calculation And Safety Evaluation Of Coastal Engineering Structures Of A Nuclear Power Plant

With the mining energy such as coal and oil being mined constantly, traditional energy available for human is less and less and the energy crisis problem become more and more serious. Consequently, nuclear power as a kind of new clean energy shows great competitiveness. It has many irreplaceable advantages:It has high energy density;The output power is stability and efficiency; It is clean, low carbon, environmentally friendly energy sources. The display of these advantages must be based on safety. Currently, all nuclear power plants in our country are located on beach, so it will be nessessary to build coastal engineering works to assure the operational safety for nuclear power plants.Though there is no big difference between common coastal engineering structures and the coastal engineering structures for nuclear power plant, considering the significant impact of its seismic performance on safety of nuclear power plant, the international Atomic Energy Agency and specifications of many countries demands it has better earthquake resistance. So the anti-seismic numerical calculation and safety evaluation of coastal engineering structures of nuclear power plant is especially impartant.Coastal engineering is measures taken to various marine environment and structures for exploiting and using marine resources. Coastal engineering structures of the nuclear power plant include the diversion dike、the middle partition embankment、the water channel、the drainage channel、the drainage culvert、the revetment、the plant revetment engineering and the Heavy Cargo Wharf (including the harbor basin and channel). The structures on the seismic analysis are the revetment(No.1、No.2、No.3)、the middle partition embankment and the diversion dike (No.1、No.2、No.3). Specifically, this paper mainly studies the following several aspects:1This paper introduces the triaxial test of static and dynamic characteristics of the foundation soil which provide analog calculation parameters. The experiment is done by our staff.2Seismic analysis of coastal engineering structures includes the analysis of sliding surface stability of pseudo-static method、static analysis、the analysis of dynamic response、the analysis of dynamic stability of the finite element method、the analysis of the stress and deformation of the flexible diaphragm wall.The results of the analysis of sliding surface stability of pseudo-static method are summarized as follows:The stability safety factor of the revetment(No.1、No.2、No.3) is greater than1.6under the SL-1seismic condition and is between1.42and1.58under the SL-2seismic condition. The stability safety factor of the middle partition embankment and the diversion dike (No.1、No.2、No.3) is greater than1.5under the SL-1seismic condition and1.2under the SL-2seismic condition.3This paper introduces the principle of the calculation and analysis and synthetically evaluate the stability of structure and foundation on the basis of calculation and analysis. The revetment(No.1、No.2、No.3) of the nuclear power plant saitisfy the stability requirement of anti-seismic I. The middle partition embankment and the diversion dike (No.1、No.2、No.3) saitisfy the stability requirement of anti-seismic Ⅱ. The pressure stress and tensile stress of plastic concrete wall is not very high, so there is no much influence on isulated and impervious function.The results can be used as basis of seismic safety assessment of structures and reference for the engineering design.