Experimental modal analysis on the core support barrel of reactor internals using a scale model

The vibration of core support barrel (CSB) in a typical pressurized water reactor is studied by experimental and finite element analysis methods. Free vibration models are built and tested for the 1/13.7th scale of Ulchin Nuclear (UCN) Unit 3 & 4. Finite element model is established by plate model with shell elements. Finite element and measurement analyses are performed with respect to the two type of cylindrical shell models with and without holes. Test results on CSB vibration models are presented and compared with finite element analysis results. Various techniques are used to compare the measurement and analysis results.