[Gwypaas]

We had economies of scale in the 50s when it was the cheapest? Or was it because we had this attitude towards nuclear engineering?

https://en.wikipedia.org/wiki/Demon_core#Second_incident

[Manuel_D]

It was in the 1960s and early 70s that it was cheapest. And the Demon Core incident was part of the nuclear weapons program, not nuclear electric power - this is a common pattern in misleading anti-nuclear rhetoric.