The non-rotating Cold Leg problem is a "feature" courtesy of vanilla Factorio 0.11.22.
 It does not affect 0.6.1.  I don't know how to fix it for 0.6.0.
  It does not affect 0.6.1.  I don't know how to fix it for 0.6.0.  
Regarding your power production issue, check that you have
1/Enough pressurized-water in the reactor, reactor circ pump, hot leg.
2/Water in cold-leg
3/Water in cooling tower water source.
It would help to show me your setup with pictures. I can not help you blind.


 If you look at my Uranium_Mod-Example-16, you will see that =).  It is a subtle point that is often missed.
   If you look at my Uranium_Mod-Example-16, you will see that =).  It is a subtle point that is often missed.




