Abstract
In December 1995, a thermocouple well was broken at the prototype fast breeder reactor Monju. In this paper, numerical simulation and water experiment of the flow-induced vibration of the thermocouple well are presented. Both the analysis and the experiment identified an in-line oscillation and the symmetric vortex shedding at the rated 100% flow condition. Furthermore, it has been found that the in-line oscillation takes place at decreased flow rate if the natural frequency of the thermocouple is reduced.
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