FIELD: power engineering.
SUBSTANCE: invention relates to nuclear reactor fuel assembly (FA). Support grid (26) for FA (20) has, substantially, cylindrical fuel rod (28). Support grid (26) includes frame assembly (40), having plurality of external strips (44) and plurality of tubular elements (50) and (or) screw frame elements (70). Screw elements (50)/screw frame elements (70) have contact area (54, 55), designed with possibility to contact with adjacent screw frame element (70) and, at least, one screw contact section (52) of fuel rod with small diameter. Small diameter is, substantially, equal to fuel rod (28) diameter, so, that fuel rod, which is in screw frame element (70), usually touches internal screw frame element (70) on fuel rod screw contact section (52). Screw contact area (52) can have variable inclination.
EFFECT: technical result is minimized wear from friction between grates and fuel rods.
9 cl, 22 dwg
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