Fig. 1-4 (Left)

Predicted vapor flow around fuel rods In a tight-lattice core of an innovative nuclear reactor, vapor around fuel rods flows from upstream to downstream like a chimney, as shown in red.

Fig. 1-5 (Right)

Predicted results of axial velocity distribution Predicted axial velocity distribution upstream of a spacer is almost uniform horizontally. On the other hand, it is locally accelerated by reduction of the channel cross section in the spacer region.

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