Some evidence for the interpretation that construction and cost problems are the root is that even France has been having these problems with recent construction projects. France doesn't have the same NIMBY or regulatory problems as the U.S. with nuclear. It's a national priority, and the legal landscape is different, you can't sue to stop projects the way you can in the U.S., because direct authorizing laws are passed by Parliament, vs. it being up to a patchwork of agency decisions (which can be challenged in court), state regulations, etc. And yet their next-gen reactor project in Flamanville is going badly, with huge cost overruns and manufacturing problems, to the point where the contractor (Areva) is seeking some kind of bailout or state buy-out of its nuclear construction business.

This is also somewhat surprising because the previous-gen projects in France are usually seen as an example of a fairly well managed nuclear industry, with construction coming in reasonably close to budgeted cost, and a good safety record.