Before revision: Terms of the program Under this Agreement, the United States and Russia agreed to commercially implement a 20-year program to convert 500 metric tons of HEU ( uranium 235 enriched to 90 percent) taken from Soviet era warheads, into LEU (less than 5 percent uranium 235 ).
After revision: Terms of the program Under this Agreement, the United States and Russia agreed to commercially implement a 20-year program to convert 500 metric tons of HEU ( uranium-235 enriched to 90 percent) taken from Soviet era warheads, into LEU (less than 5 percent uranium-235 ).