[icehawk]

I don't think you understand how a swiss cheese failure happens. They're not independent or semi-independent. Latent failures, expose active failures, like:

"Committed hard to an assumption that was wrong"

Then causes damage to the seawater pumps along the shoreline, and flooded emergency diesel generators.

That causes total loss of AC and DC power.

Loss of AC and DC power causes the reactor to overheat.