Nuclear is good for the last 10% (and very contextually - it maybe makes a lot of sense in Alaska but far less sense in Arizona, for example), but mostly we should be building more solar/wind/batteries, as they can be built both faster and increasingly cheaper over time (the cost of batteries has dropped ~97% in the last 20 years IIRC, solar and wind have similarly been dropping in price).

The main argument for nuclear besides "baseload" is that nuclear plants can potentially last for a century and will thus amortise its capex quite easily and afterwards become relatively cheap for most of its life. Except, given just how quickly solar is dropping right now, it's unreasonable to assume that 50+ years from now (so, in ~2076) already-built nuclear will be cheaper than contemporary solar tech (I.e. solar panels built in 2075). In fact, it's unreasonable to assume that nuclear plants will necessarily be longer-lasting than future solar panels, given current research into self-healing solar panels (which clearly isn't commercially ready, but very likely will be within 50 years). Even if they can only self-heal 3 times, that's 4x the lifetime for 120 years total, and much longer if the base lifetime of the panel is more than 30 years. And frankly nuclear will never beat solar panels on operational costs - nuclear has a 24/7 guard, a nuclear reactor and a turbine, whereas the closest thing PV has to moving parts is the de-dusting machines.

Similar logic for solar also applies to wind and batteries, of course - their price has been dropping like a rock for decades. And that compounds - if both solar and batteries get twice as cheap and their lifetime lasts twice as long, then the whole package becomes 4x cheaper. And the cheaper wind turbines get, the fewer batteries solar needs to plug the holes in intermittent generation.

A quick aside: a lot of focus on solar lifetimes assumes the minimum will be the average, but e.g. 1980s solar panels are still in operation with only 10-20% performance degradation IIRC so the popular assumption that solar panels last only 30 years seems a bit ridiculous.

China's nuclear stats should be kept in perspective by the way: IIRC ~90% of the generation they're building is non-nuclear renewables. They're also building more of basically everything than the rest of the world combined, so an absolute stat like "they're building 37 of X" isn't particularly useful except for conveying that China is building a lot of stuff.

To repeat, though: the US should still build nuclear plants (unless/until they get financially blitzed by renewables). My point here is to keep it in perspective.

And I don't mean to insinuate you said otherwise, I'm just kind of pre-emptively responding to a stereotype/common set of associated arguments, I guess.