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This case study demonstrates the investigation into the operating characteristics of a Reactor Cavity Cooling System (RCCS) during passive operation.
The RCCS is a heat removal system designed to remove heat that is radiated from the Reactor Pressure Vessel (RPV) wall. The RCCS is able to operate during active operation where the flow is driven by a pumping system or during passive operation where flow is induced by means of buoyancy forces.
Challenge
This case study demonstrates the investigation into the operating characteristics of a Reactor Cavity Cooling System (RCCS) during passive operation.The RCCS is a heat removal system designed to remove heat that is radiated from the Reactor Pressure Vessel (RPV) wall. The RCCS is able to operate during active operation where the flow is driven by a pumping system or during passive operation where flow is induced by means of buoyancy forces.
Benefits
•Thorough Sensitivity Analysis on system.
•Ambient conditions taken into account.
•Flashing behavior of the system modeled.
•Thermal inertia.
•Buoyancy forces taken into account.
Solutions
The sensitivity investigations revealed that the RCCS is insensitive to change in ambient pressure when the tank is at 15 °C. The effect of ambient pressure becomes more evident when the tank is at saturation temperature. This is ascribed to the change in saturation temperature with ambient pressure, which in turn affects the flashing behavior of the system.