Abstract
This report shows an experimental study on the high damping characteristics of the U-bend tube bundle Steam Generators in PWR-type nuclear power plants. The tube bundle is tied up with a rodstructure called "anti-vibration bar (AVB)". Four test models which are the partial and the fullsize mock-up of the practical plants are excited with a three dimensional shaking table. It, at nrst, shows the basic characteristics of the tube bundle. Secondary, the quantitive estimation of the damping ratio is reported. The vibrational characteristics greatly depend on the exciting direction. Then, the estimation of the out-of-plane direction is 8%, and the one in the in-plane one is 15%. They are more than a present damping ratio, 1%.
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