The AP1000 is designed as a self-contained single unit reactor. This has certain advantages in management, where it is known that managing a 4 unit plant is a nightmare. The AP1000 doesn't really need shared facilities, unlike the old CANDU with its monstrous vacuum building.
The Chinese layout is shown in this picture.
You can see how they hug the water source, and the electrical facilities go out the back. It is unclear how they will handle water intake and discharge, but I suspect they are simple pipes thrown in the water. We would most likely have a shared tunnel intake and outflow, like Darlington A. The forebay would be behind the plants.
I have calculated the general footprint of one reactor to be about 100 m and 300 m long. You need to place them about a width apart. As such, I have come out with this layout for Darlington.
As you can see, it's ugly and mashes up a lot of existing buildings. As well, there is a mountain of dirt under this site, and it ends up very close to the quarry blasting. That is why I call it a 'postage stamp'.
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