SUPPORTING GRID-FILTER FOR FUEL ASSEMBLY OF NUCLEAR REACTOR Russian patent published in 2017 - IPC G21C3/30 

FIELD: electricity-producing industry.

SUBSTANCE: supporting grid-filter is made in the form of a perforated plate having a hexagonal shape in a plan with round holes for the installation of guide channels (GC) or supporting pipes (SP) and central pipe (CP), with grooves for passage of the coolant and with support platforms for the contact with the tips of fuel elements located on the right triangular grid. Supporting platforms are made in the form of a circle, with a diameter not exceeding the diameter of the butt end of the fuel rod tip. The grooves for the passage of the coolant are arranged uniformly in the circumferential direction relative to the centers of each hole and the supporting platforms in regular hexahedral prisms co-axial with fuel rods, GC (SP), and CP, with inscribed base diameter equal to the pitch of the location of the fuel rods. The lower edge of the grooves is shifted in the circumferential direction by a certain angle until the grid-filter is become opaque in the direction of the FR axis, and the part of the groove at the outlet of the coolant from it is parallel to the FR axis.

EFFECT: increased efficiency.

2 cl, 4 dwg