[en] The ultimate disposition of nuclear wastes is frequently mentioned by opponents of nuclear power as an unresolved issue, and it is true that adequate demonstrations of nuclear waste disposal have not been performed. It has been suggested, however, that technology is either available or readily amenable for full-scale radioactive demonstrations once necessary Federal policy and criteria decisions are made. Public acceptance of nuclear power would be enhanced if the uncertainty of nuclear waste disposal is dispelled by successful waste disposal demonstrations under the full scrutiny of the public. It is our opinion that only full-scale radioactive demonstrations of waste disposal would qualify as an adequate demonstration and thereby reduce the antagonism which retards development of nuclear power. Thus, now is the time to initiate such demonstrations and we suggest that the concept of metal encapsulation of solidified high level waste forms be used as the method that can be acceptable to both the public and industry. This paper will briefly introduce the metal encapsulation concept by presenting a process flow sheet for encapsulation of wastes that would be produced by a 5 Mg/day reprocessing plant. Some probable attributes of metal-encapsulated waste forms and glass monoliths and of the fabrication processes for these waste forms will be discussed in order to illustrate the bases for the recommendation that metal encapsulation be the preferred route to achieving successful early demonstrations of nuclear waste disposal