Ticking block entity, Pastebin included:
http://pastebin.com/XKCaMQ9L
I haven't exactly figured out how to use this reactor yet, so it may be user error. The reactor controller that I had did have a Hohlraum in it's inventory slot (empty). Trying to figure out what does what. I had to manually MCedit the block out to load the world again.

Hey! In order to trigger the reaction, the hohlraum has to be filled with D-T fuel, which can be created via a Chemical Infuser. The crash is my fault, though - I shouldn't assume that an inserted hohlraum contains some amount of fuel. Fixed in development, expect the fix later today!