This study is directed toward the analysis of a reactor model that is thermally nonlinear. The significant sources of feedback in the closed-loop model are dilatational changes of the fuel due to axial expansion caused by temperature and metallurgical phase changes. The dynamics of this phenomena have been represented on the PACE electronic analogue computer.The model was subjected to unusually large inputs of sinusoidal power and did not show any drastic tendencies toward being unstable.
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