Starting up a nuclear reactor - GIF

[nova_robotics]

That is insane! What is actually going on in that clip?

Bad sound effects. It does not sound like that. They're starting up the reactor, there's a bit of a thud, then it glows blue from Cherenkov radiation. Looks like they only ran it for a few seconds then shut it down. Interesting side note; water is excellent at blocking radiation. You could jump in that pool and swim around and you'd probably receive a dose slightly above background.

https://en.wikipedia.org/wiki/Cherenkov_radiation

That's probably some university reactor or something. It doesn't make power. It's just there so they can experiment with it.