Improved Noise Analysis Methods for on-Line Testing of in-Core Instrumentations and the Determination of Power Reactor Parameters

摘要

In-core and ex-core neutron detectors and core-exit thermocouples at the Borssele reactor thermocouples are used for the determination of the core physics parameters, such as core flow velocity and reactivity effects, through noise analysis. Local vibrations of the in-core instrument guide tube and sensor responses are also characterized by noise analysis. Improved noise analysis methods are presented and are dedicated to the on-line reactor monitoring system which has been in operation for two years. The methods include partial and multiple coherence analysis and uni- and multivariate autoregression techniques. Monitoring of core physics parameters and sensor characteristics, obtained by the present on-line noise analyses, will contribute to enhanced reliability of the power plant operation. 11 figs., 22 refs. (Atomindex citation 15:044188)