Well, for the sake of entertainment let's see: I suppose Samsung still want to be able to manufacture products in its Texan factories for more than 5 years (which according to my small European contry is roughly the time it took to build a nuclear power plant in the 70's) and they have billions (oh and Apple too) and according to Google's first results:

     Companies that are planning new nuclear units are currently indicating that the total costs (including escalation and financing costs) will be in the range of $5,500/kW to $8,100/kW or between $6 billion and $9 billion for each 1,100 MW plant.

So why not ? They'd control one more link in the supply chain.

"So why not ? They'd control one more link in the supply chain."

Because operating a nuclear reactor is a whole different thing, than operating a chip plant and you usually want to focus your energy, not spread it out. And when the goal is, to just have blackout save energy for your chip plant, then there are way cheaper, riskfree and faster solutions, like batteries, or gas generators.