Norway actually used to have prisons modelled built on the so-called Philadelphia model [1] with strict isolation. Unsurprisingly it didn't work very well.

It was also one of the prisons that eventually helped drive public opinion away from US-style prisons as punishment because of how extreme it was (recognised also in a 1/3 reduction in sentences if you served there...). It was closed in 1970, around the time when the Nordic movements towards criminal custody reform started really gaining traction.

[1] https://en.wikipedia.org/wiki/Botsfengselet but the Norwegian page is far more extensive: https://no.wikipedia.org/wiki/Botsfengselet