Mark 1 reactor design:
http://www.talonfiremage.pwp.b…p2n61a84zmda1hqmd7d0th4w0
Output power: 100 EU/t 
!
Requires: 186 copper, 16 tin, 132 iron, 4 gold ingots, 42 uranium ingots, 19 rubber, 12 redstone, 2 glowstone dust, 2 lapis, 4 diamonds
Tested in Minecraft