My casuc reactor from Russia!
1970 EU/t. The temperature is near 4000 and never riched 5000 (i've made a counting machine and was afk for a very long time)
If reactor is turned off or has no uranium the cooling turns off automatically. That's why i use nuclearcontrol, but it can work without it.
i also have a breeder, that goes on temperature 9000-10000 and can make 48 new uranuim, using 6 uranium cells at one cycle. but it uses nuclearcontrol to keep temperature.