Development of core diagnostic methods and their application at Swedish BWRs and PWRs

Some results of the noise diagnostic research, performed at the Department of Reactor Physics of Chalmers University of Technology are presented. This work has been made in co-operation with the Swedish safety authority and t he power plants. The subjects discussed in the paper are: (a) Localization of a channel instability in a BWR; (b) Determination of the axial elevation of a control rod with neural networks in a PWR; (c) Diagnostics of core-ba rrel vibrations in PWRs. New methods were developed or known methods improv ed in order to handle these cases and the methods were tested through analy sis of measurements. This paper gives a review of this work and its results .