Control System of a Super Fast Reactor with Single Flow Pass Core

Abstract

The one-pass supercritical pressure light water fast reactor has different core structure from that of the two-pass cooling type one. The distance between inlet and outlet channels of the one-pass supercritical pressure light water fast reactor is shorter with less core water inventory due to the removal of the gap channels. Its responses to a perturbation are similar to those of the two pass core. However, change of the outlet temperature regarding to a perturbation of power to flow ratio in the one-pass cooling type fast reactor is larger. It is important to suppress the change as small as possible to keep the integrity of the reactor structure. Early designs of power and pressure control systems of a supercritical pressure light water fast reactor are applicable to control the power and pressure parameters, but it is not for the early outlet temperature control system which considered only the outlet temperature deviation as the feedback. An improved outlet temperature control system which considers both the signals of outlet temperature and power deviations as the control feedbacks can be applied in the one-pass cooling-type fast reactor with adjustment on the control’s parameters. Optimized control’s parameters can suppress the change of the outlet temperature significantly without oscillation. By using the control system, responses of the one-pass supercritical pressure light water fast reactor to the designated perturbations satisfy the criteria.