Thanks for the detailed response. Fascinating. Where do you come across this information? I’d also love to learn more about this nuclear event from Soviet spacecraft.
Some of my coworkers do work related to orbital debris. I've learned a little bit by osmosis (mostly the right jargon to type into Google to get useful query results).
The Soviet spacecraft were the slightly confusingly named US-A series, also called RORSAT in English. The Wikipedia article[1] is a good start, but you can find some more technical info if you search around for papers on "NaK droplets"
