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Shielding and Activation Calculations for the German Fusion Device WENDELSTEIN 7-X

The shielding property of the hall walls of the new German fusion device Wendelstein 7-X was calculated using MCNP and ANISN while varying different parameters. Attenuation factors and dose rates for neutron and induced gamma radiation are presented. The resulting effective doses are compared with radiation protection limits, which led in some cases to changes in the planning. Weak points in the wall i.e. doors, ducts and channels were investigated with MCNP. Neutron streaming was observed in all those cases. The activation of the walls and of the door opening device was calculated with MCNP and GRSAKTIV for different irradiation patterns and different decay times.