I find it deeply upsetting that anything important for a nuclear power plant is using an OS without protected memory.
You don't need protected memory if your program is the only thing running. Plenty of microcontrollers have no protected memory and get used in safety critical applications.
Protected against what?
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You don't need protected memory if your program is the only thing running. Plenty of microcontrollers have no protected memory and get used in safety critical applications.