Could you consider adding Bluetonium as an optional dependency?
Just like the already supported Plutonium Breeding, it is a fork/continuation of Nuclear Fuel as well, only Bluetonium adds Thorium to the mix, so I'd prefer it over Plutonium Breeding for being a little bit bigger.

Plutonium Breeding has marked Bluetonium as incompatible already, so you can rely on not both being active at the same time.

I considered it, and decided against it. By adding an additional fuel cycle, Bluetonium is in the category of nuclear mods which make the nuclear power system more complex, if just barely. I consider the scope of this mod to be to keep the vanilla level of complexity, but with more realistic energy values.

I consider Plutonium Breeding to be within scope because it is merely a more realistic substitute for Kovarex enrichment, which it replaces by default. And, to be honest, because I also play with Plutonium Breeding, and so need this mod to support it for them to get along. Maintaining support for 4 different configuration states (the presence and absence of Plutonium Breeding rather than just making it a required dependency, combined with the option to enable or disable the Nuclear Cores option) is already supporting 3 different version of this mod that I don't play with myself.

I see. I'm sorry to hear that, yet I understand you.

For what it's worth, I never was a huge fan for nuclear power in Factorio, given how simple and sustainable solar (panels + accumulators) were.
Your mod changed that and made me really excited about nuclear.

At the moment, I am trying to figure out a way that makes your mod, Bluetonium, Plutonium Energy and Atomic Overhaul compatible with each other.
I love how they increase the complexity, but I'm close to considering tying them together from the outside is impossible due to their control.lua behavior that I can not overwrite from the outside.

Whatever I end up with, thank you for exciting me for nuclear. :)

Hi! Bluetonium is now compatible!

I can't say much about those other mods, and trying to merge all of those different approaches to nuclear energy together could be quite the challenge... but I have done what I can do, anyway, and made appropriate changes to Bluetonium so this mod should now be compatible. It does so by adding NPR as a hidden optional dependency and trying to copy the changes made, which mostly works. This also means that NPR should not add Bluetonium as a dependency as it would create a loop.

I made things simple on myself by not even bothering to support nuclear cores; Bluetonium will just throw an error if you try. I feel like this isn't really an issue because, as noted in the description, you wouldn't be reprocessing cores in any reasonable amount of time anyway.