>>3742600 (lb) U.S.-Kazakhstan cooperation
This link may also provide some clues for that time period:
>https://2009-2017.state.gov/r/pa/prs/ps/2010/11/151138.htm
There was a video floating around here a week or so ago with a nuclear engineer talking about the enormous economic potential of nuclear waste.
Only watched a bit, but lost the link. Kept thinking about Kazakhstan and its huge stores of spent fuel.