Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Dispersion equation for the reactivity meter

10/02/2016 2016 - #03 Global safety, reliability and diagnostics of nuclear power installations

Yuferov A.G.

DOI: https://doi.org/10.26583/npe.2016.3.04

UDC: 620.039.516.2:620.039.515

The aim of this work is the output and analysis of the metrological model of the reactivity meter in the form of the dispersion equation, connecting the dispersion of input and output signals of the reactivity meter with imposing random noise on the input. Hardware-software implementation of the dispersion equation in the composition of the reactivity meter gives the opportunity to display the uncertainty evaluation of reactivity in real time. It is proposed to standardize the form of the equation for the reactivity meter, presenting the main computing unit of the reactivity meter as equation convolution. Thus metrological characteristics of the reactivity meter is completely determined by the hardware function of this unit. The hardware function is the transitive characteristic that describe the processes on delayed neutrons after the jump in power. It is shown that the frequency response of the linear unit of the reactivity meter allows us to consider additive input noise as white. Is established the practical coincidence of frequency characteristics corresponding to the fission by the thermal and fast neutrons. For the case of white noise at the input was obtained the expressions of the variance of reactivity with exponential and discrete representation of the transient response of delayed neutrons. Was calculated coefficients of the dispersion strengthening for a number of known systems of the constants of delayed neutrons when the input signal is either a power or speed. It is found that the dispersion strengthening is minimized by using the power as the input. Is specified the problems and directions for further research and development, concerning, in particular, the analysis of the reactivity of error estimates for the various circuit design of the reactimeter taking into account the range of applied electronic components.

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reactivity meter metrology dispersion equation control and management of nuclear facilities