Importance

Loading Importance Indicators...

Abstract

A nuclear fuel assembly for use in a pressurized water reactor comprising a top nozzle and a bottom nozzle, fuel rods loaded and supported by grids in cells thereof and interconnected between a lowermost grid and the top nozzle, and a filter member interposed between the lowermost grid and the bottom nozzle. To prevent the intrusion of foreign matters such as linear ones in cooling water under flow into the fuel assembly, the filter member is configured to have upward conical protruding portions and downward conical protruding portions below the fuel rods and below a crossing comer area of walls of the grid cells, respectively, so that the upward protruding portions may be defined therein each with four through-holes for flowing water, thus forming a curved crisscross solid face in a vertically projected shadow zone of the fule rod whereas the downward protruding portions may be defined therein each with a through-hole of a curved crisscross form for flowing water in a vertically projected shadow zone of the crossing comer area of the cell walls. Because of the construction, a total projected area of the through-holes over a lower core plate is nearly zero.

Loading the Abstract Image...

First Claim