Then there's a problem with nuclear fuel. The sources are mostly countries you don't want to depend on.
You are of course right with your assessment that nuclear is green, safe and eco-friendly. That's a hard one to swallow for a lot of eco activists.
The exemption being France and maybe China?
France did a programme of nuclear power stations rather than the 1 or 2 offs that seem to be the norm elsewhere and that seems to have worked pretty well.
I'd be surprised if HPC is competitive with solar + wind + BESS when it comes online but I could well be wrong
Barakah (delivered March 2024) was late (by about 3 years?), undersold (KEPCO hadn't any other ongoing project and the Korean government at the time wanted a nuclear phase-out) and various tricks are now known: https://en.wikipedia.org/wiki/South_Korean_nuclear_scandal