I found a bug that allows one Reactor Chamber to affect more than one Nuclear Reactor at the same time.
Also there is a second bug where the sounds do not mute right away after changing the sound level to off.
I have uploaded a Youtube video showing these glitches.
This video was recorded in Minecraft 1.8.1 with the mods Industrial Craft 2 version 1.15 and TooManyItems version unknown.
http://www.youtube.com/watch?v=IefroTLATv8
I'm sorry if this is a double post I checked Nuclear Reactor treads in the bug forms and didn't find any thing like this.