I don't know about French nukes, but French-affiliated aerospace has a general rep as being leakier than most. Eh, "leakier" is a negative way of putting it . . how about "loose-lipped"? One tools selection from a French-based vendor - a cloud option for uncontrolled data - was turned down by uniformed dudes from the program office, based on this prejudice. But a similar cloud offering from "Ze Germans"? Oh, that was A-OK. Both products seemed built from compressed pellets of Turkish dander - of course they did, this is DoD shopping - but one of them did have that snappy Aryan zing.