have you noticed you can use wooden pipes to EXTRACTS stuff from reactors? If you time the clocks right, you can get a bucket to cool the reactor EVERY tick (+500 heat stable setup, nice to meet you!) and then pull the empty one out.
Now, is there any automated way to FILL buckets ... ? Edit: BC pump?
I have tried extracting the buckets with a wooden pipe. This works, the only problem is the wooden pipe will also extract the Uranium cells. Which I don't want. I know I could re-direct the Uranium cells back in to the reactor. It just does not work well.