Perturbation Theory for Reactor Neutronics
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Perturbation theory in neutronic analysis for nuclear reactor system is often necessary, when we analyze and compute the effect of small changes on the behavior of a reactor. On the other hand, for a uniform occurrence of perturbation throughout the entire reactor or a region of it, then, we use methods that we have so far discussed and presented in previous chapters, although we never encounter uniform perturbation in practice of reactor operations. However, most of the changes, which occur in the operation mode of a reactor, are non-uniform, and there are numerous examples of such non-uniform perturbations.