What is the discharge destination of the StartUp Feed Pump?

The StartUp Feed Pump's primary function is to assist in increasing the flow of feedwater to the Main Feed Pumps (MFPs) and to ensure that adequate water is supplied to the upstream high-pressure (HP) heaters. This is crucial during the startup phase of a steam generator or boiler system when operational pressures and temperatures are still being established.

Pumping water directly to the MFPs allows them to function more efficiently by maintaining the necessary flow rate and pressure to ensure proper operation of the system. Additionally, supplying water to the upstream HP heaters helps to preheat the feedwater before it enters the boiler, optimizing performance and enhancing the overall thermal efficiency of the system.

This role of the StartUp Feed Pump supports maintaining system integrity and efficiency during the critical early stages of operation, which makes this choice the correct answer.