The Ion Beam Applications Company is developing a compact superconducting cyclotron for hadron therapy. This C400 cyclotron will deliver 400 MeV per nucleon 12C beams and will be installed in the Advanced Resource Center for Hadrontherapy in Europe in Caen, France. Shielding studies are based on the Particle and Heavy Ion Transport code System (PHITS) to compute the secondary neutron sources and MCNPX for the transport of these neutrons inside the facility.