SPACER GRID OF A NUCLEAR FUEL ASSEMBLY TO PREVENT FLOW-INDUCED VIBRATION

摘要

The present invention relates to a spacer grid of a nuclear fuel assembly, capable of improving a slot structure formed in the transverse direction in a grid plate to reduce flow-induced vibration by swirl in the axial direction, comprising multiple flat plate grid plates (110) configuring a unit grid cell, wherein the grid plates (110) has an elongated hole part (111a) formed in the transverse direction regarding the charging direction of a fuel rod and a protrusion part (P) formed to protrude along the edge forming the elongated hole part (111a), thereby inhibiting flow separation between the grid plates by inducing the swirl of coolant in the axial direction, inhibiting flow-induced vibration by alleviating imbalance of pressure caused thereby and reducing the flow-induced vibration by only a simple forming process without largely deforming the shape of grid plates configuring the spacer grid.