Abstract

A new formulation of the noise spectra in at-power reactors is presented. Input noise source is determined in such manner that ready comparison is possible between the, square modulus of the reactor transfer function and the noise spectrum. The physical meanings of the noise-equivalent source are clarified. A new noise source additional to that of zero-power reactors is found, which results in a non-white contribution to the input noise source spectrum. The basis of the present theory is a set of macrostochastic variables characterizing the state of the reactor possesses Markoffian property. Three types of reactions are taken into account—source emission, linear and bilinear reactions.

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