Scaling and design of PUMA and SBWR

The General Electric Nuclear Energy (GE) has developed a new boiling water reactor called the Simplified Boiling Water Reactor (SBWR). Major differences between the current Boiling Water Reactors (BWRs) and the SBWR are in the simplification of the coolant circulation system and the implementation of passive emergency cooling systems. There are no recirculation pumps to drive the coolant in the vessel of the SBWR. The emergency core cooling and containment cooling systems do not have active pump-injected flows.