Study on Operation of Small Lead-Based Fast Reactor Based on Constant Ratio of Flow to Power

In order to study the operation strategy of small lead-based fast reactor, the core transfer function model is established, and the operation schemes of constant ratio of core flow to power and stable core nuclear power are designed by using proportional-integral-derivative (PID) controller and control rod drive mechanism. The control systems with different operation strategies are established respectively, and the simulation of primary loop flow step and core reactivity disturbance is carried out. The results show that under the condition of introducing primary loop flow step down, the stable nuclear power operation scheme leads to the high core outlet temperature due to the constant core power; in the case of constant ratio of flow to power, the core power decreases with the primary flow, so that the core outlet temperature is stable in a safe range. When there is step reactivity disturbance, both schemes can quickly control the overshoot and overshoot of core power, and the core outlet temperature is basically constant.