Nuclear Fuels disables Kovarex Enrichment Process which makes the technologies added by this mod unresearchable. Fortunately Nuclear Fuels also has an option to reenable it as a startup option. Took me way to long to figure this out so I could use the mod.

Sorry to hear about that. I'll add to my list to see what can be done to improve the compatibility.

Is the mod in question "Nuclear Fuel" by GotLag?

Yes that's the one. It's not a major thing, I just want others to be warned and provide a fix if anyone else has the same problem.

One way to make it compatible would be to use plutonium instead, and change the tech requirements away from kovarex.