Sump is sealed for radon remediation and doesn't drain water. What can I do for water drainage?
Put a surface pump at the lowest portion of the basement? That should keep the flood down to an inch or so; not perfect but better.

(You could build up some sort of basin around the mechanicals so they have their own "sump" sitting on top of the slab... but Murphy's Law says that the next failure is going to be somewhere else in the system.)