Regarding the IC2 coolant being a power conductor fluid thing; you know that you HAVE to have some sort of small tank to buffer the stuff and measure with a comparator to regulate the reactor on/off right? It just wouldn't feel right not using a GT drum for that to me.
I remember building huge facilties with several completely self-sustaining Nuclear Heat Reactors with IC2 and AE. Part of the energy was used to UU-Matter-produce new Uranium (with a positive energy yield because what are laws of conservation right?)
Depleted uranium cells were automatically processed into new ones and the fuel change worked autonomous as well.
Unfortunately Greg doesn't let you make radioactive elements with his mass fab