Abstract: A grid with coolant deflecting channels for used in nuclear fuel assemblies is disclosed. In the grid, two sets of intersecting grid strips are arranged in sets at right angles to each other prior to being encircled by four perimeter strips, thus forming a plurality of four-walled cells individually placing and supporting an elongated fuel rod therein. Each of the grid strips is made up of two narrow sheets which are deformed at a plurality of regularly spaced portions to provide nozzle-type coolant deflecting channels. The channels individually have an upright Y-shaped or reversed Y-shaped configuration capable of so deflecting coolant as to mix low temperature coolant with high temperature coolant. The channels thus form a uniform temperature distribution within a fuel assembly. The channels are so inclined with respect to the axes of the fuel rods as to form wide and linear positioning springs at middle portions thereof.
Type:
Grant
Filed:
December 8, 1998
Date of Patent:
October 10, 2000
Assignees:
Korean Atomic Energy Research Institute, Korea Electric Power Corporation
Inventors:
Heung Seok Kang, Kee Nam Song, Kyung Ho Yoon, Youn Ho Jung, Tae Hyun Chun, Dong Seok Oh, Wang Kee In, Je Geon Bang