A tungsten rod is a good way to take out a reactor without much fuss.
The rod would be dropped from the air and plummet to the reactor housing where it would punch a small hole in the containment, letting out a little puff of radioactivity before crashing through the reactor pile and embedding itself in the ground below the reaction chamber. The chamber would melt down over the rod, obliterating its presence and rendering the reactor unusable.
I am familiar with all of that, but do they actually exist in reality, not theory? If they actually exist then they would be very useful here as a non-nuclear way to deliver some stunning blows.
Your post reminds me of something...cue dream sequence...
“It’s a small thermal exhaust port, right below the main port. The shaft leads directly to the reactor system. A precise hit will start a chain reaction which should destroy the station. Only a precise hit will set off a chain reaction.”