I was just messing around and noticed pipes can attach to a reactor (they will not attach to reactor chamber). What good is this you may ask? Well how about an automated cooling system by injecting Ice automatically in to a slot in the reactor? Which can be even further refined with the RedPower mod . I have tested and it does work. Downside is you will loose the ability to attach 1 reactor chamer, so it will have a maximum of 5. The other downside is having to find ice. That is unless someone manages to get the ice cream mod working in 1.7.3 so you can make ice out of snow, albeit a useless mod otherwise (no offense to someone who likes it). This plus creating the recipe in an automatic crafting table and viola ice... Next step is to convince Alblaka to create a refrigeration unit in Industrial Craft 2 to make Ice .
*Edit - This may also work for injecting buckets of water, I have not tested.