FIELD: power engineering.
SUBSTANCE: invention relates to atomic power engineering, namely, to nuclear fuel assemblies (NFA) of VVER type nuclear reactors. For local suppression of a neutrons burst it is proposed to use an additional absorbing grid (AG) installed on angles inside a casing in the bundle. NFA with the AG is made in the form of a thick perforated plate with conical holes oriented with the holes wide side opposite to the heat carrier flow, the AG is made with the help of hydroabrasive cutting.
EFFECT: technical result is simplification of design of NFA with the AG, reduced volume of welding to the minimum one (only welding with angles remains), reduced hydraulic resistance and reduced labour intensity while maintaining its absorption capacity.
3 cl, 3 dwg
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