96% is recycled the remaining 4% is sealed in lead, sealed in concrete and placed in a bunker. IIRC 200m^3 per year is generated meaning 50 years of Frances energy production could 1/10th of an average American football stadium
The problem here is that the difficulty of storing spent fuel isn't so much a function of its mass, it's a function of its heat production. The latter is what limits how much waste you can put into a geological repository. Separating out the 238U (which will still have to be handled carefully unless it is extremely clean of shorter lived isotopes) will not reduce the heat production of the remaining waste significantly.
The French have admitted their reprocessing doesn't save money vs. just disposing of spent fuel directly.
