Bring an advanced radation suit, plenty of rad-x and radaway and enjoy the creepy atmosphere. And what RobotMilk said, be sure you try all terminals, good luck!
finding that armory was one of the hardest parts of the game, you don't realize how dangerous one rad a second is unti you go through 20 rad away and when you finally exit have 997 radiation. Then you get to play the game of fight the dangerous golden geckos but don't hit a radiation patch or you die several times until you get it right. As posted above the map is bloody useless find a video it'll make more sense then. good luck you'll need it.
If you get your Rad Resistance up to 85% then even 1 RPS will get a huge cut to something like 0,15 Rads Per Second
Edit: And the Armoury is on the third level down. It's hidden quite well. If you exit the Reactor area into the main area I think the armoury is on your right.
I'm also thinking about drawing up some Point A>B>C>D>E directions to make it easy for those who can't navigate the dang thing