Abstract
This paper presents the results of the noise analysis of two fuel rod irradiation experiments - NILOC I and NILOC II - with LMFBR mixed (U,Pu) nitride fuel, irradiated in the High Flux Reactor (HFR) at Petten. The fluctuations of the thermocouple signals in the shroud together with reactor neutron detector signals have been analysed in time and frequency domain. Bi-variate autoregression modelling results in experimental step response times. Corresponding temperature responses and step response parameters have also been calculated using a computational code for a two-dimensional (R-Z) time dependent finite difference thermal model, for a perturbation with a step in heat generation. Comparison between the experimental and calculated results gave satisfactory information for validation of the model and the experiment. The potential of the application of noise analysis methods in fuel irradiation experiments is discussed.
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