[en] This technical report is an update of Bituminization of Radioactive Wastes, Technical Reports Series No. 116 (1970). The initial report focused on an emerging technology and the underlying optimism that bitumen was a universal matrix. With the experience gained from the operation of full scale industrial facilities and from research into the performance of bituminized products, an assessment on how bituminization processes can now fit into an overall strategy dealing with nuclear wastes is presented here. This report is intended to describe the major processes that are operational and to clarify which liquid and solid wastes are suitably matched to the physical, chemical and radiological properties of bitumen. This is not an exhaustive compendium of all the literature published on bituminization, but is an attempt to cover the current bituminization processes and describe their basic features, including their limitations, which, however, also exist for any other solidification technique. In its form of presentation and with its extensive bibliography, this report may be of assistance to Member States in comparing the advantages and the drawbacks of the various processes, with the aim of meeting their specific needs in the field of the conditioning of low and intermediate level radioactive wastes. In the Annex characteristic data from a number of bituminization facilities in some Member States are tabulated. These facilities may be taken as representative of the current practice, as they are built and operated to cover, each in part, a wide range of wastes from different sources, e.g. nuclear power plants, reprocessing plants and research establishments. 117 refs, 16 figs, 28 tabs