NUCLEAR FUEL GRID ASSEMBLY WITH HYDRAULICALLY BALANCED MIXING VANE PATTERN

摘要

PURPOSE: A supporting grid having a mixed blade pattern accomplishing the hydraulic power balance is provided to minimize the cooling water flow-induced vibration created in the supporting grid by arranging a plurality of the mixed blades in a regular pattern. CONSTITUTION: A strip divides a plurality of unit lattice cells. A lot of springs are projected on the lattice plane of the strip in a fixed direction vertically and horizontally. The spring supports a fuel rod by using constant elasticity. A plurality of mixed blades are projected to the downstream of the cooling water flow from the upper end of inner grid surface of the supporting grid. The arrangement of the mixed blades forms a pattern on the supporting grid. The mixed blades of right and left domain of a longitudinal reference line(20) are composed in the symmetrical form with each other. The mixed blades of up and down region of a lengthwise reference line(10) are composed in the symmetrical form with each other.