ACR-1000 ECC Design Concept

Abstract

The emergency core cooling (ECC) system in the Advanced CANDU Reactor is based on the existing CANDU-6 ECC design, with improvements to simplify operation and enhance safety. The high-pressure emergency coolant injection (ECI) system cools the reactor fuel following a loss of coolant accident (LOCA) and meets stringent targets for core cooling and refill time. Core make-up tanks (CMTs) limit the voiding in the intact loop of the reactor coolant system (RCS) following a LOCA event, or in both RCS loops during rapid cooldown events causing shrinkage of primary inventory. The four-division long-term cooling (LTC) system performs post-LOCA cooling and recovery, and cools the RCS following events with the pressure boundary intact, including normal reactor shutdown.