Gotlag's Nuclear Fuel: https://mods.factorio.com/mod/Nuclear%20Fuel
I consider Kovarex to be a horrible abomination of a terrible game mechanic, and want something to replace it. This particular Nuclear mod is pretty minimal, which makes it a nice choice for a hopefully smooth compatibility process:
- Normal uranium refining and fuel cell production unaffected
- Fuel cell reprocessing can yield Plutonium
- Plutonium can be used to make breeder cells that produce more plutonium
- Plutonium can be used to make MOX (i.e. normal Uranium) cells to consume plutonium
- Plutonium can be used to make nuclear weapons
The mod can be loaded fine, but IR's recipe overwrites (2), which makes it un-usable. I think that is the only change technically required to make it work.
However, for full immersion compatibility, the plutonium fuel cell and reprocessing recipes should probably use tubes rather than iron plates, to match the IR changes to Vanilla.
I'm going to give the adaptation a shot using this mod as a base (I've never done compatibility hot-patching before); will post if I get anywhere with it.