11.  The pools have mechanical cooling and filtration systems that circulate water past the spent fuel rods, which continue to generate heat years after being removed from the reactor.

12.  The pool required two trenches for buried plumbing that would enable the new filter to circulate the water and clean it.

13.  This future is hinted at by small solar panels at the Refuge that circulate water in pools for birds.

14.  Turn on so filter can circulate water.

15.  Babenko said divers would circulate water in the compartment to improve visibility and take water samples to analyze the situation inside the compartment before entering the vessel.

16.  The plant transfers energy from the reactor to turbines through dual systems of circulating water.

17.  Umbilical cords from the bell to their suits pumped breathing gas and circulated warm water to keep them from freezing.