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Multiple Timescale Expansions for Neutron Kinetics - II: Illustrative Application to P1 and P3 Equations
Volume 151 · Number 2 · October 2005 · Pages 194-211
Technical Paper
B. R. Merk, D. G. Cacuci
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Closed-form expressions for three-timescale approximations are developed for the one-group time-dependent P1 and P3 equations for a homogeneous multiplying medium in planar geometry with two effective groups of delayed neutrons. The development of these three-scale approximations does not rely on imposing separation of space and time. The differences between the three-scale approximations for the P1, P3, and diffusion equations, respectively, are analyzed in detail. In particular, the results obtained using the three-scale approximations for the P1 and P3 equations underscore their efficiency and accuracy, particularly for the shortest timescales and in the presence of large reactivity insertions.
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