The heat production of larger, higher power TRIGA reactor facilities will generally require a higher capacity and very reliable heat sink. The secondary system is designed to transport heat from primary system to the atmosphere via an evaporative cooling tower. The typical system is designed to furnish 12.6 m³/min of water to the plate type heat exchanger at an inlet temperature of about 33 °C and an outlet temperature of about 42 °C. The heat transferred to the heat exchanger is then transported to the atmosphere by the secondary coolant through a two unit-cooling tower. The secondary coolant is circulated by two centrifugal pumps. A piping and instrumentation diagram of a 3 MW system is shown in Figure 3.