What does 'reactor operating' refer to in terms of reactor status?

What does 'reactor operating' refer to in terms of reactor status?

• A. Any mode other than 3, 4, 5, or defueled.
• B. Mode 3.
• C. Mode 1.
• D. Mode 4.

Answer: (A)

Understanding what counts as operating status means recognizing which reactor modes indicate active power production versus shutdown. In practice, reactor operating describes modes where the plant can produce power or is being brought toward power production. Non-operating states are those where the reactor is not generating power: hot standby or hot/cold shutdown, refueling, and defueled conditions. Hence, any mode that still involves a fuel-filled core and the potential to generate electricity is considered operating, while modes that imply shutdown, maintenance, or no fuel are not. This is why the statement that reactor operating includes modes other than those non-operating states (and defueled) best captures the intended meaning.

Understanding what counts as operating status means recognizing which reactor modes indicate active power production versus shutdown. In practice, reactor operating describes modes where the plant can produce power or is being brought toward power production. Non-operating states are those where the reactor is not generating power: hot standby or hot/cold shutdown, refueling, and defueled conditions. Hence, any mode that still involves a fuel-filled core and the potential to generate electricity is considered operating, while modes that imply shutdown, maintenance, or no fuel are not. This is why the statement that reactor operating includes modes other than those non-operating states (and defueled) best captures the intended meaning.