Abstract
Using reactor noise techniques, a vibrating in-core instrument tube in the Mühleberg Boiling Water Reactor could be detected. The normalized auto power spectral density (NPSD) of the current fluctuations of a mini in-core chamber, fixed within the instrument tube, has been analyzed before and after repair. There was a strong evidence of a peak at the resonance frequency of the vibration at 2.6 Hz in the NPSD. It vanished promptly after the bypass-streaming at the lower core plate, being the physical origin of the vibrating instrument tube, was re-arranged.
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