...err the video is 90% a tour of the ORANO La Hague spent fuel recycling facility... by adults.

Oh really?

For its part, the US Energy Department, which owns almost 50 tons of excess Cold War plutonium, contracted with the French government-owned nuclear-fuel cycle company, Areva (now Orano), in 2008 to build a MOX fuel fabrication plant. But the United States switched to a “dilute and dispose” policy for its excess plutonium in 2017 after the estimated cost of the MOX plant grew from $2.7 billion to $17 billion.

Source

how much though? I was under the impression that the vast majority of US nuclear fuel is "once through" and the waste goes into long term storage.