FIELD: nuclear power engineering. SUBSTANCE: gas-filled cavities are made inside fuel elements in active zone and possibly between fuel elements and between assemblies so that active zone has average porosity factor not less than 0.4 which enables sodium reactivity void erf to be diminished to value not exceeding fraction of delayed neutrons. EFFECT: rigid spectrum of neutrons and correspondingly high-bred reproducibility factor, comparably little doubling time. 3 cl, 6 dwg, 1 tbl
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