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The multi-channel test rig (T1-M) of the fuel stack test section in a helium engineering demonstration loop (HENDEL) is a large-scale experimental facility which simulates one fuel column of the HTTR core. A crossflow test was carried out using the T1-M. The objective of this test is to investigate the thermal and hydraulic characteristics in the fuel stack under the conditions that produced the crossflow through a gap from the outside of the graphite blocks into twelve coolant channels. The crossflow was forcibily produced by a parallel gap situated between the third and fourth blocks from the top of those in the heated section mounted in the vertical direction. The crossflow was 43~56% of the total flow rate of helium gas in T1-M for heated flow and 5~37% for isothermal flow, and that became more in an outer channel of Nos. 7~12 channels than in an inner channel of Nos. 1~6 with decreasing the gap width. Also it was found that the crossflow affected a redistribution of flow rate flowing into the channels and a tem-

Experimental Studies on Thermal and Hydraulic Performance of Fuel Stack of VHTR,(VI). Results of Crossflow Test by HENDEL Multi-Channel Test Rig.