This paper discusses research on the intensity analysis and damage experiments of a universal joint. The Kashiwazaki Kariwa nuclear power plant suffered damage from the Niigata Chuetsu offing earthquake which occurred on July 16, 2007. The earthquake motion damaged a driving shaft coupling of an overhead traveling crane of the No. 6 nuclear reactor building. The damaged portion consisted of the universal joint. The target of this research focuses on the universal joint and the cause of its damage from the earthquake, as well as the design of proposed measures. As a cause of the damage it is thought that the universal joint was loaded from the torque of the earthquake motion. The torque that loaded to the universal joint is calculated from the earthquake motion. The stress that loaded to the universal joint is calculated by an analysis by 3DCAD (Three Dimensional Computer Aided Design) and CAE (Computer Aided Engineering). In the experiment, a miniature model of the universal joint is loaded with the torque and damaged. Similarly, in the analysis by 3DCAD and CAE, the miniature model is loaded with the torque and damaged. The experimental result is compared with the analysis result and the validity of the analysis is examined. The proposed measures to improve the design of the universal joint to form earthquake loads are examined by 3DCAD and CAE.

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