Space charge and dielectric response measurements to assess insulation aging of low-voltage cables used in nuclear power plants

Bernabè, Marco (2012) Space charge and dielectric response measurements to assess insulation aging of low-voltage cables used in nuclear power plants. [Laurea specialistica], Università di Bologna, Corso di Studio in Ingegneria energetica [LS-DM509]
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Abstract

The current design life of nuclear power plant (NPP) could potentially be extended to 80 years. During this extended plant life, all safety and operationally relevant Instrumentation & Control (I&C) systems are required to meet their designed performance requirements to ensure safe and reliable operation of the NPP, both during normal operation and subsequent to design base events. This in turn requires an adequate and documented qualification and aging management program. It is known that electrical insulation of I&C cables used in safety related circuits can degrade during their life, due to the aging effect of environmental stresses, such as temperature, radiation, vibration, etc., particularly if located in the containment area of the NPP. Thus several condition monitoring techniques are required to assess the state of the insulation. Such techniques can be used to establish a residual lifetime, based on the relationship between condition indicators and ageing stresses, hence, to support a preventive and effective maintenance program. The object of this thesis is to investigate potential electrical aging indicators (diagnostic markers) testing various I&C cable insulations subjected to an accelerated multi-stress (thermal and radiation) aging.

Abstract
Tipologia del documento
Tesi di laurea (Laurea specialistica)
Autore della tesi
Bernabè, Marco
Relatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM509
Parole chiave
space charge, dielectric response, dielectric spectroscopy, pulse electro-acoustic method, low-voltage cables, nuclear, accelerated aging, radiation, EPR, CSPE, EPDM/EVA
Data di discussione della Tesi
20 Dicembre 2012
URI

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