Hey, well I'v been playing around with reactors and I managed to create a good setup/formula thing to make my Mark 1 reactor be quite efficient, I'm not sure how the website worked but the results I got seemed legit.
If the website I used didn't lie to me this Mark 1 reactor:
-Never explodes (Unless you don't allow to cool).
-Cool time 45 Seconds.
-Generates 110/eu per tick.
2 Of these reactors with this setup can Power a MFSU, Massfabricator and 2 Recyclers (Overclocked 2x4 and still generate more power).
Check my video out and it has the formula on there:
http://www.youtube.com/watch?v=G_htpKUlOso
Like and subscribe if you will help me out.