Design of a guaranteed shutdown state using solid rods for the ACR-1000 reactor

This paper presents the design of a rod-based system for long-term shutdown, known as the guaranteed shutdown state (GSS), of the ACR-1000 ^**TM reactor. Previous CANDU® designs rely on soluble neutron poisons to achieve long-term shutdown. However, due to the operational complexity of using soluble neutron poisons, an alternative shutdown method was desired. The GSS design presented here uses solid boron-carbide rods with a simplified drive …