Hybrid nuclear reactors promise near complete transmutation of almost any high level radioactive waste. The general process is to produce a sub-critical nuclear reactor (i.e. the nuclear reactions would stop under normal conditions) and bombard the reactor fuel with neutrons. The neutrons break apart the large radioactive elements, releasing energy. This energy is used to power the neutron source needed to start the fission reaction. There will be some some high level radioactive waste produced (generally parts of the neutron source) but in comparison to the amount of radiactive waste consumed, this will be minimal. This high level waste will need to be place into long term storage.
Ezra Gold ezrg_ltd@uhura.cc.rochester.edu