Nuclear Power plant core with compressed saturated gaseous storage

Don't open the lid until the spin cycle is finished! 36 kilo-rads are agitating in there! That's enough to send your ship across time and space at the speed of thought! Furthermore, the specially engineered bonus compressed saturated gaseous storage tank holds up to 450 metric tons of liquid helium, so you won't run out no matter how often you inhale it to make amusing high pitched voices!