That and they have ways to reuse “spent” nuclear fuel in newer reactors that can use fuel that older reactors have finished using.

I remember hearing that some may even have LTE to fallback to.

Yep! Base load generation is the amount of energy that is constantly required and it has to be consistent. Any city or area will always use a certain minimum amount of energy, at every hour of the day. There is never a minute that demand dips below and this is called the base load. Intermittent renewables without storage can’t cover it, yet.

The other problem is economics. Hydro, geothermal, natural gas, nuclear, and coal can be operated to generate consistent reliable amounts of energy to cover it but at different costs. Removing hydro and geothermal as not all regions can leverage it - leaves, generally, coal, nat gas, and nuclear. Coal has been generally actively phased out over the last decade (in the US at least, I’m sure elsewhere), leaving natural gas and nuclear as options.

Nuclear with a substantially lower, if not negligible, carbon footprint outside of construction has so much red tape and lack of expertise and economies of scale that each plant and part ends up being close to bespoke with high costs and long construction times. Something like eight years and multiple billions of dollars.

Natural gas plants can be brought online in something like 1.5 to 2 years for substantially lower costs due to mass production, broader expertise, and less regulation.

What this leads to is a price per kW for being something like $.80+ for nuclear and like ~$.20 for natural gas over the lifetime of the plant.

These are all figures I loosely recall and haven’t confirmed or updated in my mind in a few years so I’m sure I’m off but the differences are roughly the same.

Small Modular Reactors (SMRs) are looking to innovate to solve this economic problem with nuclear by providing mass production capabilities of nuclear power but we aren’t there yet.

So, for now, economically, natural gas is often chosen over nuclear just as coal was before it. Hopefully that changes in the future sooner rather than later.