I got a comment on my earlier article about this. I'm glad to report that it has nothing to do with the general neglect of these giant transformers, allowing them to sink away, like the Tower of Pisa. No, this has to do with general neglect in maintenance!
Seems that when these things are off, and you want to work on them, you hook up a bunch of grounding straps to leak off stray currents. These are big huge copper things. It's kind of important to take them off when you fire it up again, but they didn't. I'll bet that was one heck of a copper-vapour cloud!
I still can't find out if they totally toasted the thing. I can't find anywhere that unit 7 has started up again. I do find it rather odd that the official story is that it was a 'ground fault'. When the public thinks of that, they think of a little trickle current that is quickly cut off by a ground fault protector.