Monte Carlo simulation analysis of integral data measured in the SCK-CEN/ENEA experimental campaign on the TAPIRO fast reactor. Experimental and calculated data comparison

•We develop a MCNPX model of the TAPIRO fast research reactor.•The model has been tested against the result of a late experimental champaign finding on overall agreement.•The source of uncertainties in the nuclear data and in the model assumptions has been discussed.•The model is sufficiently accurate to design irradiation experiment in support to R&D activities on LFR and ADS systems.