barking up the wrong tree.
a good ol’ american worker is almost certainly at fault.
it is likely not a part but a welder at fault and defective or faked x rays
Welder so aren’t perfect. That’s why nuclear welds are inspected, and have more “pictures” taken of them than your first grandchild. The welder blew it sure... But something else was going on that the inspector didn’t flag it. Somebody will go to prison over this.
This is probably somewhat associated with the government using self certification.