I made a state of the art Vibranium reactor, however for some reason every time I open the save, the FRZW that was at a temp of -999 is at a temp of eactly 64537.85 degrees. Here's the ID if you can fix the problem : 3018067
As far as I can see, you've already fixed the problem. However, the problem is obviously caused by the fact that you set the temperature much lower than the minimum value (-273.15C/0K). FRZW at an initial temperature of 0C will cool the reactor just as well. By the way, the amount of FRZW is very redundant, a smaller amount is enough for you.