"Is there anything the RIAA can do to reduce illegal file-sharing without generating massive amounts of bad publicity?"
They could put more effort into making file-sharing legal. That would reduce the amount of illegal file-sharing.

Gas phase uranium hydride reactors (such as the Hyperion power cell) cannot melt down. Even if they could achieve conditions equivalent to meltdown, they do not use a structural fuel-- meltdown is irrelevant, from a reactor accident perspective, in addition to being impossible.