Used uranium fuel cell recycling is now a major part of Nuclear power.
Used uranium fuel cells can no longer be used to create U-238, now they have to be processed into new Fuel cells.
This mod is inspired by the PUREX process, which is used to recycle some of the nuclear waste produced in fission reactors.
The process is a bit modified and very simplified to fit the game.

The image shows a diagram of the whole process.