Abstract
The activation of structural components such as radiation shielding, magnetic coil supports and cryostats located in regions remote from the plasma chamber has been studied. The neutron flux, energy spectrum and irradiation history correspond to the EEF reference reactor, representing a power reactor based on a NET design concept. The data libraries UKACT1.5 and UKDECAY3 are used with the inventory code FISPACT to predict the radionuclide inventories at various cooling times together with the derived quantities such as specific activity, decay power, dose rate and biological hazard index. The dominant nuclides and the principal pathways for their generation are identified. As a consequence of the softer neutron spectrum and the lower flux relative to that at the first wall, different reactions are important in the production of radionuclides that set limits on impurity levels and the options for decommissioning and management of end-of-service components are affected. The results of the calculations are used to indicate chemical elements that would be undesirable in these structural materials.
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