| 摘要 |
PURPOSE:To increase liquid film flowrate on the surface of fuel rods, and thermal margin by providing vanes to cause circling flow at corner part most distant from the control rod in a channel box, and the surroundings. CONSTITUTION:Fuel elements are assembled by connecting a round cell ring 7 to support a fuel rod 1 and a neighboring round cell ring 7 by welding or the like. On the side of the round cell ring 7 to support fuel rods 1, vanes 8 are provided in the direction slanting to the length direction of the fuel rods 1. Therefore, circling flow is caused in the space between fuel rods 1 by the vanes 8, heat transfer is promoted by the thickening of liquid film on the surface of the fuel rods 1, the critical power is increased, and thermal margin is also increased.
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