[en] The main results of the elaboration of the test data sets, collected during the development of a research program carried out by the Dipartimento di Costruzioni Meccaniche e Nucleari of Universita di Pisa, for the study and the characterization of a shell type shock absorber for a LWR spent fuel cask at present under study in Italy, are discussed. The test program included several impact test series on reduced scale models for practical and economical reasons, as the prototype weight will be over 64,000 kg. The experimental data were elaborated against the results of a dimensional analysis of the structure dynamic deformation problem. This analysis indicates, in synthesis, for the acceleration an inverse and for deformation a direct proportionality to the scale factor. Actually the values of the adimensional monomials, derived from the analysis and calculated by means of the experimental values of variables such as acceleration and deformation, are in a fair mutual agreement and seem to form a statistically significative set of data. Also the overall efficiency of the impact limiter was confirmed by the relatively low expected acceleration values for the prototype. (orig.)