Abstract
For a demonstration pool-type sodium fast reactor (CFR600), load rejection and emergency shutdown conditions put forward sharp requirements for the reactor control system by introducing abrupt changes in power and flowrates. While the sodium pool has a slow temperature response resulting from the heat capacity, the change in the circuit flowrates at the initial stage of the transients could lead to fluctuations in the intermediate heat exchanger, steam generator, and other essential devices. This research firstly clarified the constraints and objectives of the working condition design, and adopted an envelope calculation method to optimize the scheme under load rejection and emergency shutdown conditions. The research proposed several optimizations of secondary pump flowrate and the BOP water supply scheme, which enhanced the stability of devices in transient conditions. The validity of the scheme is finally re-checked from the perspective of energy transportation. It is concluded that by targeting at increasing heat transfer and reducing equipment fluctuation in the initial stage of transient, the optimized scheme realizes the balance between safety and economy to a certain extent. This research may provide the guidance for experiment configuration and the further study.
