Heya. Elifre here with a tutorial on making a self-regulating reactor. I got the idea from this thread:
First off, you'll need IC2 and Redpower Logic, Redpower Core, and Redpower Wiring (part of the Integrated Redstone mods).
You can check out the wiki for Redpower Logic here:
Next, you'll need some Red Alloy Wire (great stuff), two Timers, a RS Latch, and a Counter, in addition to all of the parts you'd need for a Nuclear Reactor.
You'll need to make something like this:
What this setup allows you to do is set the run time in the timer facing >, the cooldown time in the timer facing ^, and the number of cycles in the counter. When the lever is on, power is sent to the first timer and the reactor, preventing it from starting. When the lever is off, the run time timer > starts spinning, and pulses after the run time. This toggles the latch, which sends power upwards, stopping the reactor from running until the cooldown timer ^ finishes spinning. When the cooldown timer finishes spinning, it toggles the latch, which sends power down. This stops the cooldown timer from spinning, and also sends a pulse to the counter. The counter, once it reaches its set limit, sends power up and prevents the reactor from activating, no matter what the lever is set to. To reset the system, you hit the button which sends a pulse to the counter on its decrement side, and allows use of the lever again.
Make sure you set the decrement to the number of cycles, or it won't run the desired number of times when you start it back up.
I hope this helps you to set up a self-regulating Nuclear Reactor!
See the attached files for screenshots of the layout.
It looks like there was a bit of a bug with the Mark V death machine. Either it lagged just a tiny bit, or there may have been a glitch with the Redpower wiring (it looked like it wasn't connected when it went up a block for some reason. I might be mistaken since the machine's only on for five seconds, and goes boom in seven. >.>), but the Mark V is no more. I -can- say that I've tested this with a nice safe Mark III, however, and it's working perfectly (no booms, cooled down fully before starting back up again).
Pro tip: give yourself a bit of leeway with the run time and cooldown time, and make sure your reactor is properly reinforced in case something goes wrong. You never know when the game's going to lag at -just- the wrong time.