This study is strongly influenced by when nuclear reactors were built. Of course there aren't any 100-year-old nuclear plants; the technology isn't that old. S

This study is strongly influenced by when nuclear reactors were built. Of course there aren't any 100-year-old nuclear plants; the technology isn't that old. Some components certainly do degrade due to use, but it's entirely feasible to reuse large portions of the old plant by replacing the components that have degraded.