Inherent reactor power controller for a metal-fueled ALMR

Inherent power control for metal-fueled ALMR (advanced liquid metal reactor) designs involves using reactivity thermal feedback effects to control reactor power. Using classical control design techniques, a control system for normal load following maneuvers was designed for a pool-type ALMR. This design provides active control of power removal in the balance of the plant, direct control of selected primary and intermediate loop temperatures, and passive control of reactor power. The inherent stability of the strong, fast reactivity feedback effects brings heat production in the core into balance with the heat removal system temperatures, which are controlled to meet power demand. A simulation of the control system successfully responded to a 10% step change in power demand by charging power at an acceptable rate without causing large temperature fluctuations or exceeding thermal limits