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On the surface, this sounds very much like a problem in the random close packing of granular materials or something like that. Just dumping the stuff in a container, assuming the fuel pellets are pretty much all the same size and don't stick to one another, your density will fall at about 0.61 to 0.62 of the density of the material itself. With a bit of "shaking" to repack the stuff, you may get an increase up to 0.64 to 0.66 or so of the density of the fuel itself (provided you don't have much "breakage" of the pellets). A lot will depend on the uniformity in size of the pellets, the shape of the pellets, the cohesion of the pellets and a few other factors. The "ceiling" for closest packing of small uniform spheres that don't break is something on the order of 63.5% of the volume available for packing them. (That means you "waste" about 36.5% of the space 'cause you can't fill it.) Statistical analysis has been at this one for some time, and it's still a rich area for debate.

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