| 摘要 |
In a fuel assembly comprising a plurality of fuel rods positioned in a spaced array between upper and lower tie-plates; a plurality of axially spaced spacers for maintaining the plurality of fuel rods in the spaced array; an open ended flow channel surrounding the array for conducting coolant upward about the fuel rods, the open ended channel having a polygon shaped cross section with substantially flat side sections connected between the corner sections; an improvement which includes a plurality of interior projections at each of a plurality of axially spaced locations in an upper portion only of the channel, the locations corresponding to placement of the spacers within the upper two phase portion of the channel.
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