Leak-off lines from MFP are connected to HP/LP stop/control valves to prevent what?

Leak-off lines from the main feedwater pump (MFP) are indeed connected to high-pressure (HP) and low-pressure (LP) stop/control valves primarily to prevent steam leakage to the turbine building. The purpose of these connections is to ensure that any leakages associated with the valves are directed away from critical areas, such as the turbine building, where steam leaks could compromise safety and efficiency.

When there is a leak, the leak-off lines facilitate the safe discharge of steam or other fluids that could otherwise accumulate and create hazardous conditions. By managing these leaks effectively, the integrity of the entire system is maintained, reducing the risk of damage to equipment and minimizing the potential for operational disruptions.

While other issues, such as water contamination, excessive pressure buildup, or turbine vibration, are important in the context of auxiliary equipment, the specific function of the leak-off lines in this scenario directly relates to controlling and managing steam leakage, thus safeguarding the turbines and their operational environment.