Radiation deep penetration calculations for the IFMIF test cell wall

Deep radiation penetration calculations were performed for the IFMIF test cell wall on the basis of two different approaches employing the Monte-Carlo technique and a coupled Monte-Carlo/deterministic computational scheme called MCDO. For the Monte-Carlo calculations, the McDeLicious code was used which is an extension to MCNP-5 with the capability to simulate the d-Li neutron source on the basis of tabulated d-Li cross-section data. Use was made of a three dimensional geometry model of the IFMIF test cell representing in detail its interior and the shielding 3 m thick heavy concrete walls. The interface program MCDO, which couples McDeLicious and the 3D discrete ordinate code TORT, was used to transport the neutrons and photons through the wall and to obtain spatial distributions of the doses in the adjacent rooms. These coupled calculations have revealed hot spots of the radiation doses in the access room neighbouring the test cell in the d-beam downstream direction. The dose rate there exceeds several times the limit of 100 μSv/h for the work personnel.