NaK Coolantcell (GregTech 4)

The NaK Coolantcell[sic] is an item added by GregTech. It's main purpose is to cool Nuclear Reactors, but it also is required in some crafting recipes. It comes in 3 variations: 60k, 180k and 360k. Each version is capable of storing the amount of heat its name suggests. NaK Coolantcells can be cooled down in a Vacuum Freezer.