Irreversible circulation of fluctuation in reactor noise.

概要

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Irreversible circulation of fluctuation, α, is introduced as a new variable for the analysis of reactor noise in the normal case, which further develops our previous for-mulation based on the system size expansion method. It is shown that α-considered in conjunction with the variance σ-provides useful information about reactor noise, apart from the data we usually obtain on power spectral density. The relations holding between α and the conventionally used variables are given for the case of steady state. The present formalism is applied to a non-linear system with three degrees of freedom (total neutron number, fuel energy and coolant energy), to examine numerically the behavior of the fluctuations. The stability is illustrated as a phase diagram in a reactor-parameter space. It is shown that the so-called soft- and hard-mode instabilities can be distinguished by observing α. It is also demonstrated that appropriate processing of such quantities as α and σ will provide advance information on instabilities in power reactors.
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