yeah I know my definition was lacking. it’s 5 AM here and I had trouble putting it into words; I understand it a bit better.
I get where you’re going with understanding why entropy can explain why such things are nonsense but then you’d need to not only understand what entropy is but also understand what it does in such a system.
you are NOT going to be able to explain that to 50+% of the population. sorry.

the reason why there’s a heavy water reactor is that construction of this design reactor was started when the shah was still firmly in power; it’s been halted for ages and ages. finishing it was the logical thing to do.
and okay, I’ll grant you that I too would rather have seen a less risky design built there (if only for their own safety, the thing is hopelessly outdated…) but reality tends to be somewhat less than ideal, most of the time.
I still don’t understand why it’s important for the general public to understand what a heavy water reactor is, though. that is just way beyond reason.
your rationale for entropy I can get into, I’ll concede that point.

and with that, since it is, as I said, 5 AM here, I’m off to bed.
was an interesting discussion, gentlemen! g’night.