Evaluation of Radiation Damage and Circuit Activation of EFIT(D1.38 - WP 1.2 - task 1.2.4)

The EFIT project (the European Facility for Industrial Transmutation, EUROTRANS, VI FP) is a conceptual design for transmuting minor actinides in Accelerator Driven Systems. The sub-critical system is a Pb cooled care (384 MW..) coupled with a proton beam (800 MeV) impinging on a Pb target. In this report, by means of the computer codes MCNPX and SP-FISPACT, some evaluations have been performed about: 1. The activation of the primary coolant (6450 tons of Pb), of the DHR exchanger (T91 steel), of the steam generator unit (T91 steel) and of the pump impeller (Ti,3SiC2). Alter 20 years of full power Irradiation, the coolant activity, as average value in the whole mass, turns out to be about ~1011 Bq/kg (207m Pb and 209Pb are the main contributors). The set of all the isotopes (inventory calculations), which are formed at different irradiation/cooling steps, is available and can be used as input for different analyses (such as the source terrm, radioactive gas release, impact on structural material corrosion, waste disposal, radioprotection). 2. The radiation damage of some relevant structural materials of the system (such as spallation module, diagrid and inner vessel i components). The neutron performances, if necessary, can be achieved acting on the irradiation 'residence time'.