I think I may have stated this in another thread: the neutron flux could be used to destroy nuclear waste (as opposed to shoving it in a mountain and hoping it stays there for a million years) so a DPF reactor fusing D+D or D+T could be used to clean up the waste of the nuclear age while producing energy (the induced fission of the waste acts as an energy multiplier) as well as the waste/fuel could be reprocessed to extract plutonium, although the plutonium produced from this process would consist of unwanted isotopes that would make it less then ideal for making bombs it could go backing into fueling existing nuclear reactors (less need for new power plants, reactor powered on what was waste and with their waste recycled don’t make new waste (say that ten times fast))