I'd say one of the biggest roadblocks to nuclear power right now is public opinion. Nobody wants one in their backyard because there's a lot of false information (and shows like Chernobyl don't help). Even though we're well into the safe area, showing that we're making them even safer might help sway public opinion to build one where it otherwise wouldn't have been at all, regardless of the multi-billion dollar cost and decade+ timetable.