Four European fuel cycle scenarios involving transmutation options have been addressed. In all cases a limited number of European countries is involved in a regional scenario in coherence with PATEROS and CP-ESFR EU Projects initial specifications (year 2010). The first scenario (i.e., reference) is the current fleet using Light Water Reactor (LWR) technology and open fuel cycle. The second scenario assumes a full replacement of the initial fleet with Fast Reactors (FR) burning U-Pu MOX fuel. The third scenario is a modification of the second one introducing Minor Actinide (MA) transmutation in a fraction of the FR fleet. Finally, in the fourth scenario, the LWR fleet is replaced using FR with MOX fuel as well as Accelerator Driven Systems (ADS) for MA transmutation. All scenarios consider an intermediate period of GEN-Ⅲ+ LWR deployment and they extend for a period of 200 years looking for equilibrium mass flows. The simulations were made using the TR_EVOL code, a tool for fuel cycle studies developed by CIEMAT. TR_EVOL has been designed to study different short-, medium- and long-term options for the introduction of various types of nuclear reactors and associated nuclear material, giving due consideration to the isotopic composition in any stage of the cycle: uranium, plutonium, minor actinides and fission products. A module for economic estimations is being developed for TR_EVOL to calculate the levelized cost of electricity (LCOE) and other important costs, based on all facilities in the cycle (reactors, repositories, reprocessing and fabrication facilities, charged with overhead, operation and maintenance, and financial costs). The results reveal that all scenarios are feasible according to nuclear resources demand (U and Pu). Concerning to no transmutation cases, the second scenario reduces considerably the Pu inventory in repositories compared to the reference scenario, although the MA inventory increases. The transmutation scenarios show that elimination of the LWR MA legacy requires on one hand a maximum of 33% fraction (i.e., a peak value of 26 FR units) of the FR fleet dedicated to transmutation (MA in MOX fuel, homogeneous transmutation). On the other hand a maximum number of ADS plants accounting for 5% of electricity generation are predicted in the fourth scenario (i.e., 35 ADS units). Regarding the economic analysis, the estimations show an increase of LCOE - averaged over the whole period - with respect to the reference scenario of 21% and 29% for FR and FR with transmutation scenarios respectively, and 34% for the fourth scenario.
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