What supplies the normal seal water to the MFP?

The correct answer is the condensate pump, as it plays a crucial role in supplying normal seal water to the main feedwater pump (MFP). The condensate pump typically draws water from the condensate system, which is a low-pressure part of the steam cycle that collects and pumps water back to the feedwater system. This water is often used to supply necessary sealing water, ensuring that the MFP operates effectively without allowing steam or gases to escape.

Using the condensate pump for seal water is advantageous because it maintains a constant supply of clean water at a low temperature and pressure, which is ideal for sealing purposes. This contributes to maintaining the integrity of the pump seals and overall equipment reliability. Other components, such as the demin water system and seal water reservoir, may have their own specific uses but do not serve the primary function of delivering normal seal water to the MFP in the same operational context as the condensate pump.