First: sorry for doubleposting (hoping someone will post while I'm typing ^^), but that's the onl way I've found to use quotation, since it's less bugged. (^^)
I only operate my nuclear reactors in steam mode now 
Why ? Is it more efficient, or just for fun ?
Suggestion: I don't know if you'll agree on this, because maybe it should be more like a BC-addons but ... I would like seing a better-than-refined-oil Fuel, produce by refining again Refined Oil ...
That could be an IC² machine, using from 5 000 to 50 000 EU to turn Refined Oil into Carbon Dust + Gas (Liquid, could also be used in cells), with Gas producing 200 000 EU per bucket, and maybe another step, Hydrogen, producing even more energy (but the conversion should be EXTREMLY slow) ...
More likely to be added suggestion (^^): Could it be possible to fill cells with BC-Oil/Refined Oil ? It would be an efficient way of harnessing Oil without using any pumps, even if it would consume Tin and would be longer. I guess this not hard to implement, right ?
Edit: Again, I've used too many "
". I can't do anything else.