Study on integrity evaluation of structures associated with nuclear power plants. Annual safety research report, JFY 2011

This study intends to refine the seismic safety foundational technologies for integrity evaluation of structures on civil, building, equipment, and piping associated with nuclear power plants, in order to find out causes of the failure induced by earthquakes and prepare enhanced safety measures against such external events. Concretely describing, it carries out refinement of analysis methods related to: 3-dimensional model of reactor building, a closer inspection of ceiling crane behavior under an earthquake vibration, and a non-liner relation of stress-strain on reactor building and roof truss structure. It also performs to consider the floor deformational model of reactor building under analyzing earthquake response and to make supplemental descriptions about the model into the analysis guidance, and to develop the seismic isolation structure reviewing guidance. Moreover it carries out refinement of analysis codes which are used for seismic analysis and stress analysis in the implementation of a governmental administration safety review with consideration of knowledge obtained through a technical supporting to revision procedure of analysis evaluation standards and implementation of cross-check analysis on seismic safety reviewing stage. (author)