Well you must have transformers at the plant xD
They are all around it:
Well the core at the power plant was buster from the earthquake / tsunami and it couldn't function, so you need backup generators to generate power for the pumps who will keep on pumping coolant into the reactor to cool the rods to prevent melt down. And plus, you need external power to start the plant as well
All electronics should be run on external power in the plant, because if the plant fails you wouldnt be able to do anything.
Nuclear power plants need yo have highly trained personnel to watch over it, i mean, just take a look at the control room:
90% of it is manually controlled, cause no computer in the world can replace human experience.
Its not really battery backup, its probably an coal or some other type of power plant next to the nuclear power plant. its a must have.
I never worry about power loss, Serbian transformers are kick ass