It depends how you defined technical issue. For example the French Areva power plant projects in Europe have been met with all sorts of issues ranging from subcontractors that are inexperienced with NPP level of quality and documentation requirements all the way to challenge of proving automation system reliability to the regulatory body. These happen in the plant vendor's native France as well, so shouldn't be cultural issues either. See https://en.wikipedia.org/wiki/EPR_(nuclear_reactor)
These are not NIMBY or political issues, but rather stem from the fact that there's been a long pause in building new NPPs in the west. All the senior people involved with earlier designs are long since retired and even the juniors that were around might have moved on. And also some of the technology choices used in old designs are not even available anymore, so there's new families of tech to prove to the regulators, digital automation being one of these to my understanding.
When you design a nuclear plant, you need to do a really careful risk analysis. That's why they are so safe.
But as time progresses, and actual designs meet reality and Murphy's law kicks it, it turns out some of the assumptions are factually incorrect. More elaborate safety requirements are needed to compensate, increasing cost.
You can't build a car the way you could 50 years ago, and the same is true for nuclear plants.
These are not NIMBY or political issues, but rather stem from the fact that there's been a long pause in building new NPPs in the west. All the senior people involved with earlier designs are long since retired and even the juniors that were around might have moved on. And also some of the technology choices used in old designs are not even available anymore, so there's new families of tech to prove to the regulators, digital automation being one of these to my understanding.