Contrast of Aseismic Design for NPP Pressure Pipelines of Class 2

At present,the RCC-M of French,ASME（2007） of U.S.A and GB50267-97 of China are the primary nuclear technical codes for the design of facilities,systems,and components,which are similar in the classification of nuclear facilities in nuclear power plants,but are not exactly the same in the piping design clauses of the class 2 pressure pipeline.For the earthquake input methods,GB,ASME and RCC-M are basically similar.The hard soil standard response spectrum of GB is relatively safer.RCC-M emphasizes on the impact of the pressure,the GB50267-97 and ASME emphasize more on the weight and other occasional loads such as earthquakes effects.RCC-M is safer than GB and ASME in level D criteria.Case analysis shows that in the conditions of lower pressure and the same stress intensification factor,GB and ASME criteria are safer than RCC-M.