anorlunda - The top of the pool is not clearly accessible in this scenario. Kind of a big deal and I forgot to mention it, I apologize. If we could easily access the top of the pool it would make things dramatically easier, as I'd just recommend a series of steel sheets be laid across the top...
I looked into foam but believe it would be very difficult to get foam all the way to the bottom of the pool (in my mind a foam tends to be less dense than water). Another issue would then be removal of the foam afterward, but granted in my initial question I didn't mention anything about...
So while I agree that sand would very likely do the trick, this wouldn't be an option for my current discussion. We're discussing a nuclear spent fuel pool, and sand would gunk things up too much for future processing.
As far as the packing density, I think it would be safe to assume that the...
Good call, thanks! The spheres I had in mind would NOT be small, likely basketball-ish size depending on various other requirements. The pools we're discussing at work have inlet-outlet ports and obviously you wouldn't want these sucked into them. With basketballs in mind, we'll go with 10"...
So I'm going to try to keep this as brief as possible, but I have a somewhat advanced physics question that my nuclear background hasn't prepared me for and I need an argument settled at work.
Say you have a 30 ft deep pool and you need to protect the contents, which comprise the bottom ~10 ft...