Abstract
The effect of a non-linear local vibration of a reactor's structural components upon the neutron field is studied with the use of a single-mass model. We clarify first what is influential in causing pattern changes of the vibrational spectrum. It is also clarified how the non-Gaussian properties of the neutron noise arise from the non-linear vibration. A non-Gaussian property measured in the Palisades is discussed from both mathematical and physical viewpoints. These considerations will provide fundamental information in detecting incidents, malfunctions and anomalies of the structural components in nuclear reactors.
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