Vogtle 3 & 4 got approved recently, though I’m not sure the 40 years number is an apples-to-apples comparison.
The elephant’s foot in the room (see what I did there?) is that nuclear is just not cheap the way it used to be. It takes a lot of steel and a lot of concrete.
The reason we haven’t been building nuclear plants is that other plants, gas, wind, and solar, deliver way more power in way less time, and with a lesser quantum of plant size.
The fossil fuel consumption of a nuclear plant, while certainly less than coal, is still higher than wind or solar.