The use of a high-boiling heat-transfer metal (lead) deterministically ensu
res sufficient nuclear engineering, and ecological safety in design and hyp
othetical accidents. The transmutation nuclear fuel cycle makes global envi
ronmental safety closet; when the equivalent activity of the lon,g-lived co
mponents of hot waste is lower than, or close to, that of the raw material
used. When such equality is reached, nuclear power can be considered to be
waste-free, in a sense. A conceptual model envisaging a large-scale, long-t
erm nuclear energy industry is proposed as a solution to the aforementioned
problems.