Ordinary, Unsuspecting Gamer - "WHAT THE HELL?? HOW AM I SUPPOSED TO KILL ALL OF THESE GHOULS WHILE BEING CONSTANTLY IRRADIATED? AND HOW AM I SUPPOSED TO OPEN UP ALL OF THESE LOCKED DOORS? WHY WON'T THIS OVERSEER DIED? GAAAAAAHH" Obsidian Entertainment - "LOL I TROL U"
There is a terminal in the room you go through to get to the reactor, it looks like a large server with a screen and red keyboard. Sorta like the robco mainframe in FO3, i dont see how you could miss it.
Yeah, dude. I spent at least three hours exploring that place. I just found the mission "Hard Luck Blues" at random, while looking for information about another quest. Wandered deeper and deeper into the vault with Rose of Sharon Cassidy, spent hours running around in circles. I found most of the access codes and terminals and what not fairly quickly, but I couldn't find the overseer office to open up the armory and shut down the ventilation system. Everything was fairly straightforward once I killed the overseer. Killing him was a pain in the behind, too, though.