Had this plant been completed, this building would have housed one pressurized water reactor. The reactor, composed of uranium fuel rods, would have been kept under intense pressure while immersed in water. Water heated inside the reactor core (due to a fission of atoms) is pumped first to a steam generator, then transfered to a secondary system where the water is turned into steam, powering the turbines. Because this system is designed in two separate circuits, there is much less chance of radioactive contamination.
Satsop Nuclear Plant construction began in 1977, but was halted five years later due to budget issues. The site was maintained as though construction would resume a few years later, but in 1993, the project was cancelled. The plant now sits 76% completed, but has been repurposed by a number of businesses, including NASA.