The Dependency of Reactivity of Burn-up in Fast Reactors

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Ml^SmiTo 'bsitoff sml.'aa-ie fast brooder react&ra frraa the tardpoint cf econosiiic geiiexatio i cf atonic po^fer^ consideration idll be gixtBu to i;Jie depaBdQnce cf reastlvity on biirB-iip of tbe luelc Ir, present thera?alplutonliaa prodxsction resct'irs the lenjjth of ^fm-z the f'.iel eleine;it is In fchn reatstor is cleterained 'by the deeii'S-to oontsol fission piodv.itpof.soning and irradiation damage of solid ttxal flea&ntp, BJi' J te g.ttsiTs accjeptahl 7all5.tarjepsciiricationso Foi he't^roiemious fehei-rxl ^-eaet-os-s of the Hanford typo tnis has restricted IrrEdiation to 400 t^' 6GC W^D/tcm of lu'ani^m in the rviarboTn More recent pcvwj:' di.elopaeKt8 nve coasideriijg exposures of the orvd-* of 15fOOO MWD/toK^ In fest reactors the poisocing effecrts of fiasion pr.'idticts are reduced be{is.-me of i-olative lou oaptiire croso soctionc at hig^ energies'o la addiUon Sn fluid fuel rerctors thar 3S the possibility o.f remo-vlng tLea bg? prcoessingo Haaiation damags reaialns e aa

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