[en] Our program on waste conditioning alternatives includes the study of coatings of simulated highly radioactive waste granules with nickel. From pyrolytical decomposed nickeltetracarbonyl nickel was deposited by chemical vapor deposition in a fluidized bed. Advantages of this method are the low coating temperatures (at about 470 K), at which suitable coatings could obtained by a special adaption of the performance. Pure nickel layers were deposited, of which the tightness, thickness, mechanical stability, crystallite size and its characterization in optical and microoptical examinations were tested. The results of the quality control showed a remarkable increase in mechanical stability, leach resistance and thermal conductivity of the coated waste granules. Therefore the obtained ductile and well adherent nickel-coatings are preferably applicable as one of protective shells in a multibarrier waste concept. (author)