That’s true. Two of the current proposals here in Texas is to expand two of the current Nuclear Plants. It is cheaper since you don’t have to build the other support/admin facilities that already exist. I would assume the technology of those reactors would be the same or similar as the other two existing.
The technology isn’t exactly the same, but it’s extremely similar.
In Texas, they’ll probably be building the AP-1000s since both Comanche Peak and STP are Westinghouse PWRs.
Every nuclear plant in the US up till now has been a custom design. The advantages of the AP-1000 and the ABWR are that they’re already approved by the NRC. All the utilities have to do is get the building permits and then prove they built it according to design.
Out of curiosity, I checked the STP website. I was wrong. They’re going with the General Electric ABWR design for the new reactors.
When I get home from running errands, I’ll check out Comanche Peak’s site.