Twisted deflector for enhancing coolant mixing in a nuclear fuel assembly

摘要

A twisted deflector (22) for enhancing coolant mixing in a nuclear fuel assembly is disclosed. The twisted deflector consists of a plurality of triangular vane supports and multiple pairs of polygonal vanes. The vane supports are respectively and integrally formed along the alternate top edges of interlocked portions (12,14) of each spacer grid for a nuclear fuel assembly. Each pair of polygonal vanes are respectively and integrally formed on the two adjacent inclined top edges of each vane support and are respectively tilted in opposite directions. The inclination angles of the two inclined top edges of the vane support may be respectively and preferably between 20 DEG and 40 DEG . The tilt angles of the tilted vanes may be respectively and preferably between 30 DEG and 50 DEG .