Radiation shielding design for IFMIF/EVEDA accelerator vault

Onishi, Seiki; Maebara, Sunao; Sakaki, Hironao; Sato, Satoshi; Ochiai, Kentaro; Konno, Chikara  

A new deuteron accelerator is planned to be build at Rokkasho-site in IFMIF/EVEDA and its shielding design is required urgently. Therefore, a shielding analysis has done with the prototype model of IFMIF/EVEDA accelerator vault by the Monte-Carlo transport calculation code, MCNP5, and cross section library, FENDL/MC-2.1. The neutron dose rates become 0.5 Sv/h at the side of the beam dump and 0.05 Sv/h at the center of the beam axis. Those are smaller than the limitation dose rate of the regularly accessible controlled area, 25 Sv/h.