To borrow the meme about LISP [1], if nuclear was so good, it would've caught on at any point in the last 80 years. And it hasn't for some good reasons:

- It's too expensive. As an example, Hinkley Point-C in the UK has a super high negotiated rate that only lasts 35 years for a plant that still needs a lifetime of 60 to justify the investment so who knows how expensive the power will be for those last 25 years;

- It takes too long to build, typically ~20 years;

- Fuel processing (to create the fuel rods) creates a lot of harmful waste (eg UF6) and it is not a solved problem;

- Processing of spent fuel is not a solved problem. There's this idea that you just stick it in a barrel and leave it for a thousand years doesn't match the reality. It typically needs active cooling for possibly decades, for a start;

- Failure modes for a single plant dwarf any other alternative. The standard counterpoint is global warming from fossil fuels but that's for the entire fossil fuel ecosystem. The clean up for Fukushima, for example, will likely take over a century and cost over $1 trillion;

- The taxpayer bears the burden for these failures because, in the US for example, the industry self-insurance fund is a couple of orders magnitude too small to cover it;

- Nuclear requires liability limits well below any such failure mode to make it remotely economical (eg the Price-Anderson Act liability limits);

- The ecosystem of building, maintaining, repairing, servicing, monitoring and regulating nuclear power plants as well as all the supply chains (eg transporting and storing fuel) takes a long time to scale up.

I really wish I understood why nuclear has this cult-like following. It's completely irrational.

[1]: https://paulgraham.com/iflisp.html