Institute Reactor

The Institute reactor is a section of the Institute in 2287. It will only be accessible once Mass Fusion is completed for the Institute or during The Nuclear Option for other factions.

Background
This ancient experimental nuclear reactor was originally built for the Commonwealth Institute of Technology before the war. Over the years, the Institute advanced the technology, made a great many improvements, and are finally nearly ready to activate it in 2287, with the goal of achieving energy independence and thus the ability to sequester themselves from the surface world indefinitely. Depending on which faction the Sole Survivor chooses there will be a change in the events that take place here.

If the player character decides to destroy the Institute they will be greeted by three hostile laser turrets upon entering the sloped hallway. In the main reactor room, there are multiple synths, Institute scientists, and two more laser turrets. Three legendary synths, Z4K-97B, XPN-20A and A-2018 are present. The player character needs to plant the fusion pulse charge in the reactor to sabotage it, which leads to completely erasing the Institute off the face of the Earth with a massive nuclear explosion. Once the charge is planted the player character is teleported out and can not return.
 * Enemied Institute:

If the player character decides to join the Institute they will be called to the reactor room to insert the Beryllium Agitator into the reactor, no turrets will be hostile and the room will be filled with scientists. By doing this the Institute will be propelled into the future with enough power to sustain them indefinitely.
 * Allied Institute:

Layout
The reactor consists of old CIT underground infrastructure adapted by the Institute for their own use. The first room contains auxiliary generators, with a long corridor leading to the control room. The control room connects through a narrow corridor to the locker room where CIT engineers once prepared for work on the reactor. The main room is centered on the tokamak fusion reactor sitting against the far end wall, with catwalks and jury-rigged Institute gear surrounding it. When fighting against the Institute, the entire area is the final standoff with elite Gen 2 synths, posted as a last-ditch defense against the attackers.

Notable loot

 * Reactor terminal password - On Z4K-97B and A-2018 during The Nuclear Option quests. Gives access to terminals in the Institute's reactor.

Appearances
The Institute reactor appears only in Fallout 4.