Highly Enriched Alternatives of VVER-440 Fuel Assembly
Evolution of VVER-440 fuel assembly is characterised by gradual increase of discharged fuel
burn-up and prolongation of fuel cycle. Mentioned effects can be reached effectively by fuel
enrichment raise and by parasitic absorption reduction. Both methods were used during
VVER-440 fuel assembly optimisation, described at this paper. Enrichment interval was
enlarged up to 5.95 % U235, parasitic absorption was limited by carcass frame of the assembly.
Basic characteristics of the best assembly proposals are presented and effects on equilibrium
fuel cycle of VVER-440 reactor are characterised.