So if I play a depleted uranium one next to the isotope it will recharge the 10k ticks? If im reading that correctly
No you need a fuel cell to recharge with. Fuel cells would be: Uranium Cell, Thorium Cell, or Plutonium Cell and their dual/quad variants.
depleted uranium + coal dust crafts into an isotope cell.
Isotope cell in an active reactor next to a fuel cell recharges the isotope. If you have ID's shown you should see it countdown from xxxx:9999 to xxxx:0.
When the isotope fully charges it becomes an re-enriched uranium cell.
Re-enriched uranium cells can either be crafted with coal dust to make a uranium cell or 8 of them centrifuged to make thorium+plutonium.
Edit forgot about the gregtech canning machine change. You may need that for your first cell, or centrifuge 16 uranium dust to get your first fuel cells and run thorium + plutonium reactors...