METHOD FOR MONITORING ABSORBER VIBRATIONS IN CORE REACTORS

摘要

The invention relates to a method for monitoring absorber rod vibrations in nuclear reactors by means of neutron detectors arranged inside and outside the reactor core. The aim of the invention is to increase the availability and safety of nuclear reactors by early detection of certain plant damage. The object of detecting, localizing and quantitating amplified absorber bar oscillations during power operation is achieved according to the invention by identifying peaks in the spectral densities of the signals of the neutron detectors caused by absorber bar oscillations at its resonant frequency, its double and triple values, and with the ratios of the maximum values of these peaks eichinvariante characteristic quantities are formed, from their comparison with reference values of the sought Absorberstab and the mean square of its oscillation amplitude, which is subjected to a trend observation and its exceeding of a threshold signals deviations from the normal operating state, are determined.