As some of you have already pointed out: “graphite is not fuel for a reactor”,
and that is why I am thinking about replacing the Graphite fuel cells, but I need some ideas.
I want to replace them with something you can get earlier than uranium, but I don't know what would be suited for that.
The plan would be to change the crafting recipe of graphite and keep it as an ingredient for fuel cells.

I would be thankful if you could give me some ideas.

Deuterium early game in your default mod. Late game if bobs mods or realistic fusion power mod are installed ?

I want something that isn't used by any other mod.
If I replaced graphite with deuterium, and someone would add another mod that adds deuterium then the entire first tier of nuclear fuel which my mod builds on would just don't exist anymore.

That is why I want something easy to produce, and preferably something that is used in reality.

Maybe you could make it so you can mine uranium without sulphuric acid but you only get uranium oxide wich would only be able to heat up water for a regular boiler or something like that, maybe this wouldn't need graphite but more advanced cells would, idk

Good Idea, I will think about implementing it.

But I am still collecting Ideas.

What do you all think about that?