When playing with angel's industries (and all other angels mods), plus all bobs, plus this one, there are two techs that unlock nuclear fuel, the one provided by this mod, and the one I assume is given by angels industry, or petrochem, one of them.

The thing is, your tech is unlockable, and works just fine, but the other cannot be researched.

Dont know if the issue is yours or angels, but I came here first

ill be looking into this, i have a feeling it is that we are both trying to "replace" bobs variant. I should be able to fix it on this end.