The AP600 (AP1000) design includes an In-Containment Refueling Water Storage Tank (IRWST) situated at the same elevation as the Reactor Pressure Vessel (RPV) hot leg nozzle. This configuration allows the IRWST to effectively collect coolant following a postulated Loss of Coolant Accident (LOCA) from the sump. The referenced document provides detailed insights into the coolant collection process and system functionality. Understanding the IRWST's role is crucial for evaluating the safety and operational efficiency of the AP600/AP1000 reactors. The information clarifies the design's response to emergency scenarios.
