Fuel Reprocessing


how can we enrich the spent fuel (used U-235)? Can we combine the fission products again like in nuclear fussion? But I think this method will used up the energy produced during nuclear fission.


The uranium 238 which makes up the majority of the fuel absorbs neutrons during the reactor operation and decays to an isotope of plutonium which may be made to undergo fission similar to uranium 235. Reprocessing the spent fuel involves chemical separation of the plutonium to be used as fuel in another reactor. There is no possibility of reassembling the fission fragments into the original uranium nucleus because of the energy considerations you mentioned.