Reprocessing doesn't turn fertile material into fissile. It mostly just costs money and pours more fission products into the nearest body of water than Fukushim

Reprocessing doesn't turn fertile material into fissile. It mostly just costs money and pours more fission products into the nearest body of water than Fukushim released. It also extracts the dregs of Pu239 and U235 to get another 5-15% of final energy out. CANDU + reprocessing is a bit better than a PWR, but still significantly under 2x the energy in the original U235. Closed fuel cycles are a myth so there is no need to specify 'once through'.