What information is NOT essential for a System Operator assessing steam power plants for return to normal operations after a blackout?

The assessment of steam power plants for returning to normal operations after a blackout requires specific critical information to ensure a safe and effective restart. Among the listed options, the status of the boiler feed pump is considered less essential than the others for this specific context.

When a unit comes out of a blackout, factors like generator output levels are crucial because they directly impact the plant's electrical output and its ability to connect back to the grid. Similarly, knowing the unit's availability for start-up is vital since it determines if the plant can be brought back online when needed. Cooling water availability is also imperative because it is essential for maintaining safe operating temperatures within the system and preventing overheating or damage during the start-up process.

While boiler feed pump status is important for overall operational efficiency and plant safety during normal operations, in the immediate context of assessing readiness for returning to operation after a blackout, it may not be the most critical piece of information compared to the other choices. Therefore, the status of the boiler feed pump can be viewed as less essential at that specific moment.