Cerberus Nuclear has provided radiation shielding support to a spherical tokamak design. We provided radiation transport and shielding assessments for both deuterium gas (D-D) and deuterium - tritium (D-T) campaigns. This involved optioneering modelling for complex bioshield designs for the walls and roof of the shielding enclosure, intended to ensure adequate shielding around the reactor for both campaigns whilst simultaneously ensuring that constraints of weight and space were adhered to.
These calculations accounted for neutrons, gammas and secondary particle generation, for both D-D and D-T shot schedules. This work was performed primarily using MCNP, with SCALE used to provide independent cross-checks of the results, and looked at the contributions of skyshine in addition to the direct radiation contributions through the bioshield walls and roof.