The first two reactors were housed in separate structures, but—to save time and money—Reactor Number Three and Reactor Number Four had been built together, back-to-back under the same roof, where they shared ventilation and auxiliary systems. Between the turbine hall and the reactors was the spine of the station, which housed the deaerator corridor. Uninterrupted by a single door or dogleg, this seemingly endless hallway ran parallel to the turbine hall, all the way from the main administrative block at one end of the plant to the western end of Reactor Number Four at the other, not quite a
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