Determining degradation of sensors used for fuel assemblies cooling temperature measurement by the analysis of thermal fluctuations noise

This work describes opportunities for continuous passive surveillance with noise analysis as the methodology, it is aimed to detect sensor degradation through response time factor calculation, to determine whether sensors have the response times within the plant safety analysis definitions, to ensure that the safety limits are not exceeded. The noise analysis techniques provide the capability for on-line monitoring of the response time of the installed sensors. (author)