MA heterogeneous transmutation in large sodium cooled fast reactor as IMF fueled target subassembly

Based on China Demonstration Fast Reactor(CDFR),the issues about Minor Actinides(MA) transmuted heterogeneously in large sodium cooled fast reactor as IMF(Inert Matrix Fuel) fueled target subassembly are studied in the paper.The results indicate that loading few targets into CDFR will introduce certain influences on core performance,mainly on obviously increased sodium void worth and differed from homogeneous transmutation,slightly increased power peak factor,while on other parameters there are relatively small impacts.High MA transmutation efficiency is obtained by IMF fueled target subassembly,especially for MA incineration efficiency,which is increased by about 1/3 compared with MA homogeneous transmutation in sodium cooled fast reactor.Additionally,for MA incineration,in IMF fuel the contribution of secondary fission of MA converted 238Pu becomes more important.In conclusion,the high MA incineration efficiency and small impacts on core performance will be achieved if the number and the loading position of target are optimized when MA is transmuted heterogeneously in large sodium cooled fast reactor.