Advanced new reactors under construction in Finland and France, which were meant to lead a nuclear renaissance, have been delayed and are running over-budget. There has been a 15-year gap in building reactors, which has meant that there are difficulties in manufacturing the high quality parts required for a reactor. The new reactor also represents an advance over existing technologies, with better reliability and safety over Generation II reactors. Finally, they are "first-of-a-kind" industrial plants, having then all the kinds of problems and delays that should be avoided in following projects.
