Nuclear Science and Engineering / Volume 13 / Number 4 / August 1962 / Pages 338-344
Technical Paper / dx.doi.org/10.13182/NSE62-A26175
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This paper deals with the space and time dependent reactor stability problem of neutron flux shape variations due to xenon-135. The effect of modal interaction on stability is investigated for a simple reactor model when the characteristic functions of the wave equation are used in a modal expansion. It is shown that modal interaction may contribute to or detract from stability depending on the circumstances, and that in the case of a very large reactor, stability can be seriously overestimated if modal interaction is neglected.