Periodic and chaotic oscillations in the nuclear-coupled boiling channel system subject to strong void-reactivity feedbacks

The present study investigates the nonlinear dynamics and possible oscillation types of a single or multiple nuclear-coupled boiling channel system subject to strong void-reactivity feedbacks. The results demonstrate a route from periodic oscillations to chaotic oscillations through period-doubled bifurcation for a single nuclear-coupled boiling channel by strengthening the nuclear-coupled effects (3Cα). Moreover, complex interesting nonlinear phenomena, i.e. unbounded, limit cycle, period-doubled, period-N and complex Rossler type chaotic oscillations, may appear in the system of three boiling channels coupled with three subcores under the condition of strong void-reactivity feedbacks (4Cα) and weak subcore-to-subcore neutron interactions (εij = 10).