Image: Neutron flux after step reactivity insertions in uranium-235
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Description: Redrawn version of Fig. 5.5 in Glasstone & Sesonske, Nuclear Reactor Engineering (1994), p. 261. The figure shows the relative neutron flux against the time after a step increase in reactivity. The three curves are step reactivities for rho = 0.001, 0.0065 and 0.014 in uranium-235 with prompt-neutron lifetime l = 10^-3 s.
Curves were recomputed from data tabulated in the book: six-group decay constants and yields from Table 5.2 (p. 246), evaluated with the point-reactor kinetics equations (Eqs. 5.9/5.11) from critical equilibrium by matrix exponential. Plotted with Matplotlib.
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