Home / Store / Journals / Electronic Articles / Nuclear Science and Engineering / Volume 91 / Number 1
J. F. Carew, P. Neogy
Nuclear Science and Engineering
Volume 91 / Number 1 / September 1985 / Pages 117-122
Format:electronic copy (download)
An analysis of the excitation of neutron flux waves in reactor core transients has been performed. A perturbation theory solution has been developed for the time-dependent thermal diffusion equation in which the absorption cross section undergoes a rapid change, as in a pressurized water reactor rod ejection accident. In this analysis the unperturbed reactor flux states provide the basis for the spatial representation of the flux solution. Using a simplified space-time representation for the cross-section change, the temporal integrations have been carried out and analytic expressions for the modal flux amplitudes determined. The first-order modal excitation strength is determined by the spatial overlap between the initial and final flux states and the cross-section perturbation. The flux wave amplitudes are found to be largest for rapid transients involving large reactivity perturbations.
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