On approach, the building is surrounded by leveled bugs. The construction site across the street is occupied by three super mutants and a hound, with its own Advanced locked safe on the second floor, in the northwest corner. The interior is a small section of the factory with another half-dozen or so bugs that spawn upon entry.
Behind the locked cashier's cage, follow the wire from the wall switch to the office above. The stairs run above the reactor. Behind a Novice locked door lies the foreman's terminal to unlock the cage. There is a Master locked safe to the right, behind the desk.
Fusion core - Inside a generator on the ground floor, right next to the stairs.
The factory appears only in Fallout 4.