Only the newest ones. As a fact the one near me is the newest in the U.S. . Unfortunately most operating now are almost 30 years old and are near the end of their life span. They shut one down in the state of Georgia that was about 45 years old and was already about 15 years past the shut down date. It was one of the early reactors in which Fukushima was based on! And it sat on top of a fault line!