HPCI – High Pressure Emergency Core Cooling Systems

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The High Pressure Coolant Injection (HPCI) system operates independently from the core cooling system and doesn’t require auxiliary ac electricity, a plant air system or an external water-cooling system. It supplies (makeup) water to the reactor to provide cooling during cooling accidents of small and intermediate loss of coolant. The HPCI is capable of supplying (makeup) water above the rated reactor pressure or below the point where the low-pressure emergency core cooling system can inject.

The Automatic Depressurization System (ADS) opens selected safety, relief valves via redundant logics that depressurize the reactor during small and intermediate accidental losses of coolants when the HPCI system is not available or cannot recover the water level in the reactor.