Fission reactor keeps exploding.

[Poopyjoe]

No matter what format i put my setup in for it, it keeps blowing up at 727 Celsius. That's what it says the max temperature is. And the control rod doesn't even work, despite having 1.2.5c (i am fairly certain i have it, at least.). I have tried every tutorial and it seems it has to be mod related, and not what i do for setting it up. It is generating power, but it keeps blowing up. 

 

At the moment i have a beastly magmatic engine setup but even that wont compare to a reactor setup. So really any help would be amazing.

[amouat2000]

Yeah, they updated Atomic Science mod, you need 2 or more Control Rods now.