Spinning Sphere of Molten Sodium

I know they're not doing this experiment - "12.5 tons of hot, liquid metal designed to spin at up to four revolutions per second" - because of any chemistry questions. Rather they're trying to explore the creation of the Earth's magnetic field.

But because they're using molten sodium, there are some fascinating chemical reactions that they need to avoid.

So they don't have a normal, water-based sprinkler system to avoid 'modestly catastrophic" because water on sodium, to quote Mr Mackey, 'it's bad, mkay'.