Influence of differences between seismic safety evaluation methods for equipment and piping of a nuclear facility

Nishida, Akemi  ; Iigaki, Kazuhiko ; Sawa, Kazuhiro

The objective of this research was to investigate the influence of differences between methods for evaluating the seismic response of the equipment and piping of a nuclear facility. For the input ground motion, one wave was chosen from among 200 waves of input ground motions of maximum acceleration of 700-1100 cm/s created for the Oarai District of the Ibaraki Prefecture. Seismic safety evaluations were performed using the conventional method, which relies on floor response spectrum data, the multi-input method, and the analytical method using a three-dimensional building model. The differences between the three methods were summarized. The target equipment and piping system were cooling systems in a model plant. It was found that the response predicted by the multi-input method and the analytical method using three-dimensional building model were approximately half of the response predicted by the conventional method.