What system should be operational before placing the MFP turning gear into operation?

The Main Feed Turbine Lube Oil System should be operational before placing the Main Feedwater Pump (MFP) turning gear into operation because it ensures that the turbine components receive adequate lubrication during the startup process. Proper lubrication is critical to reduce friction and wear on the moving parts, which can help prevent damage and ensure the smooth operation of the turbine.

The turning gear is designed to slowly rotate the turbine to ensure that all components are properly aligned and lubricated before full operational speeds are reached. If the lubrication system is not operational, the risk of seizing or damaging the bearings and other components increases, which can compromise the integrity of the turbine and its associated systems.

While other systems, such as cooling water or water circulation, are important for the overall operation and safety of the system, they do not have the same critical impact on the immediate need for lubrication during the turning gear operation. Ensuring that the lube oil system is functioning properly takes precedence to safeguard the equipment.