Abstract
The space dependence of neutron noise is investigated as a function of reactor size and frequency of excitation, with regard to malfunction localization. An analytical expression for the relative importance of the higher harmonics of the Greens function is given and evaluated for typical sizes of commercial power reactors. It is concluded that localization of thermal hydraulic excitations through neutron noise signals is practically impossible. The case of rod vibration excitations is examined in detail. A 3-dimensional analytical expression is derived for the neutron density response to rod vibrations; it is concluded that rod malfunction localization through neutron noise is not a practical proposition.
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