Abstract
Operational Modal Analysis techniques are widely used in civil, aerospace and industrial applications. There are several methods and one of the most utilized is Enhanced Frequency Domain Decomposition (EFDD). In the nuclear sector, part of this method was applied to analyze simulated neutron detectors data with promising results in the framework of CORTEX project. Given the possibilities of this methodology, in this work, EFDD was fully implemented to characterize the Beam Mode frequency region in plant data from two KWU reactors. The results show that closely spaced resonances can be separated and that three modes of vibration are found. The mode shapes obtained for each resonance give information on the physical origin of the vibration and with them it was proved that the dominant resonance in the Beam Mode region is not connected to a pendular motion.
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