I know someone who knows about those reactors and follows chem and bio news since forever including tracking missing hot material.
Talking about energy I mentioned it when hearing about it here. She said the problem is no one wants it. She talked more detail and some states wouldn’t take it if you gave it to them but is writing a book on it when she has the time. She said there are reactors now that are loaded up on waste and don’t know what to do with it. No one wants it and where ever it goes will outlast us. That something like that would take a long time to work out. Just a FWIW