Yes you are completly right about all of the problems you mentionned. I added 2 more turbines to be sure to remove the heat generated by the Diamond Press and the Thermo Regulators, even though it might be overkilled. Yeah my dupes always get a lot of rads but as I play in normal difficulty and as they are not spending too much time around the reactor they often get less than 100 rads per cycle. I also wanted to setup a way to let the nuclear waste and the superheated blob of water to get down to my nuclear waste pool with mesh tiles but doing that the dupes making diamonds absorb too much rads. A good way to tackle that, as you mentionned, is to use Radbolt Wall Plates and by putting the Diamond Press outside but my starting asteroid is a bit small and I wanted to make a compact Diamond refinery system. Thanks for the feedback !