Stefan Viljoen schrieb:

> - mains electricity (I shiver to think about a nuclear plant suddenly losing
> all computerized instrumentation and monitoring systems)

Which is why nuclear power plants (at least in safety-aware western 
world) come with multiply rendundant systems, at least one of which is 
independent of electronics.

For instance, a reactor might have control rods held in place by 
solenoids; cut the power, and are driven into the core by gravity or 
loaded springs, effectively shutting the reactor down.

> - water supply

I guess this will actually be the worst. Food is second.

You forgot heating systems. Those come third, though warm clothing and a 
lot of warm blankets can help you some. Well, maybe in Africa it's not 
that much of an issue...

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