Not likely. I don't believe Samsung makes their own bare wafers and I know of no fab that makes wafers on site. I don't think the demand model would work to make that vertically integrated. A couple crucibles can easily supply a Fab and the bulk cycles of crucibles is uite different from the more unitized fab production.
Well, this is the only explanation I have for loss on such scale, and the fact that wafer manufacturing is the only thing that can't be usually backed up with UPSes.
All DRAM fabs use a lot of proprietary pixie dust treatment for wafers these days, and it is not looking improbable that they had a wafer manufacturing on site.
If they were to loose power on a stepper line, they would've only lost wafers being currently processed.
On my memory, there was a number of wafer shortages when Taiwanese wafer makers had similar incidents. As far as I was told, if a crystal forms on a crucible wall, touches it, or moreover the whole thing freezes, a big part of equipment becomes a write off, and after that it will take few months for a company to resume production.
