Abstract
In the frame of extensive work for the development of incipient failure detection methods, neutron noise signals in PWRs of different designs have been investigated using correlation techniques and interpreted by means of theoretical and experimental analysis of the vibrational behaviour of reactor internals. As driving forces of the dominant neutron noise sources have been identified: core barrel beam mode vibrations, shell mode vibrations of cylindrical components and fuel assembly beam mode vibrations. Variations in the long term behaviour of the ex-vessel neutron noise spectra are shown and related to changes in the mechanical properties of fuel assemblies.
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