It's not a huge building, but it is pretty visible, especially from the water. I wonder how many of the boats going by on the bay know what it is!
You don't need any protective gear, as the water shields the core. There are detectors all over the place anyway. The building next door is the Atmospheric Chemistry building, which is pretty new, built in the 90's, I think.
QTOFFER, the cooling "towers" are to the left of the reactor. They are pretty small....this reactor is small enough that they can just shut it down and walk away, no need to keep the water moving for the up to 5 days a commercial reactor would need. The water convection alone will keep it cool enough.
And yes, I was thinking about how many fish you could keep in there....except that they'd have to be smart fish, since if they went too close to the core they'd be dead, radioactive fish!
Here's a pic from the water....the reactor does stand out