This is my first ever Post (and nuclear reactor design!) ever, but I think it's pretty efficient.
:Reactor: MARK 1 :Reactor:
6 Reactor chambers
Efficiency : 3.6 (MAX)
GenTime: Full Cycle
EU/Gen : 72 Mil
Total EU : 72 Mil
Collector MK3 (40 EMC/second) Next to an Energy condenser with the target block being ICE.
Then, Place down a relay, so it outputs the items to the Reactor chamber.
OPTIONAL: Use The MFFS addon to create a failsafe system with heat monitoring. EG: When it reaches 2000 Heat, the Client will emit a redstone signal, which can be wired directly to a Nuclear reactor linker (Something on those lines). This will turn the reactor off, then everyone is happy. MinecraftNotch