Abstract : The modeling of a nuclear facility is a necessary tool to define the radiological environment
and to draw the rays map. This quantification is an important phase in the conception
of a facility. It allows to know how the facility respects the safety constraints as well as
the general operating for what it is authorized. This work presents S3 as an example of
the modeled nuclear facility. S3 (Super Separator Spectrometer) is a device of SPIRAL2
dedicated to the experiments with high intensity stable beams to study heavy and super
heavy nuclei, especially the neutron deficient ones. Light nuclei, namely those produced
by transfer reaction, will also be available in S3. In this work we present the modeling
of the current S3 facility, the simulation results of particles transport and the rays map
(neutrons and other light particles) in S3 building. Some consequences of these calculations
as the damage for electronic components will also be presented. These studies used a Monte
Carlo calculation method with the code PHITS2.82. Keywords : Modeling, Monte Carlo
simulation, Particles transport, Neutron doses
