In the framework of the EUROTRANS Integrated Project (6th EU FP), the feasibility 01 an European Facility for Industrial Transmutation (EFIT) of Minor Actinides (MA) by means 01 an Accelerator Driven System (ADS) has to be investigated. One of the main objectives 01 the ENEA FPN-FISNUC division, leader in the task 1,2.4, was the preliminary definition of the sub-critical core and of the Fuel Assembly (FA). The EFIT sub-critical care is loaded with a U-free oxide fuel (obtained from a MOX spent fuel), inserted in a Magnesium Oxide inert matrix and cooled by lead. The keff multiplication factor is assumed to be 0,97: the lacking neutrons are provided by an external proton accelerator and the spallation process in a lead target. This work summarizes the FA and care specifications, obtained by an accurate neutronic design carried out by means 01 deterministic and Monte Carlo codes, The actual requirements and the optimization criteria have led to the so called '42-0' concept. By this approach, a zero net balance of plutonium is stated while the maximum MA fission rate of 42 (kg TWh-1) is reached. The core size is 384 MWth and presents three radial zones, in order to maximize the average power density (~ 350 W cm-3 on fuel pellet) and to respect the cladding temperature limit 01 550 °C. Since the burn-up swing during the cycle results by about 200 pcm/year, the proton current results practically constant and never exceeds 16 mA (at 800 MeV proton energy).
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