The cooling rig is a bog-standard aquatuner + steam turbine rig, tho, again, there's a couple of variations here.
1) The ph2o coolant sits in two reservoirs down below. I have learned that precisely loading a loop of this size is a sucker's game, cuz I inevitably wind up changing the loop a little and having to do pipe work.
2) It first snakes through the h2o pool in radiant liquid pipes, before it runs through the entire base in ordinary granite pipes.