The plant operators I know would disagree. The Auxiliary Feedwater Pumps I am familiar with are Safety Class 2 systems. That means they are SAFETY RELATED, and are needed for safe shutdown during accident scenarios.
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Yes it can be used for short term Station Blackout. But after 4 hours it is questionable that these AFW pumps can continue operation because of lack of electricity from batteries. Even Westinghouse says so in the link you provided. Here is Westinghouse statement:
“Proper operation of the AFW system in a PWR traditionally requires DC power from a station
battery, steam from the steam generators and an adequate supply of secondary plant water. The total amount of current draw on the station battery can be a limiting factor in determining the duration of SBO coping.”
https://www.westinghousenuclear.com/Portals/0/operating%20pl…
Again I say that the AFW for long term (>4 hours) Station Blackout is Mickey Mouse. I am also an expert on nuclear power plant systems having worked for Westinghouse and Bechtel Power Corporation for over 30 years on nuclear power plant engineering.
Fukushima became a disaster in their long term Station Blackout.
Jaak