Believe it or not, early game nukes don't blow, Its all dependent on your implementation.
Set up a simple reactor
like this guy. Bam, 3 million EU for every uranium you dig up. It takes 3 stacks of copper ingots, a little more than a stack of iron, and 16 gold, and you've got 60 eu/t.
Now, hold on a sec, let me explain what makes it so good: wire up an MFE or MFSU to it and set to emit redstone if full. Connect that signal to your reactor with an XOR gate and you won't waste uranium.
The problem with early game reactors is that people try to run them 24/7. If you automate their power production to a power storage device, they are amazing. If you don't, yes, they suck.