高温ガス実験炉燃料体の伝熱流動実験 Ｖ ＨＥＮＤＥＬ多チャンネル試験装置による高温試験結果

Abstract

Experimental studies on thermal and hydraulic performance of fuel blocks of the very high-temperature gas-cooled reactor (VHTR) have been performed with a multi-channel test rig of fuel stack test section (T1-M) installed in a helium engineering demonstration loop (HENDEL).Present paper reports the experimental results obtained by a high temperature test that He gas was heated up to 1, 000°C in 12 T1-M. Under the conditions of uniform heating of 12 simulated fuel rods installed in the fuel block, it was found that a flow rate distribution of He gas in 12 fuel channels was almost uniform, radiant heat flux from the fuel rod was large considerably, and average heat transfer coeffcients agreed with the correlation reported previously. On the other hand, the temperature distribution in the horizontal cross section with power distributions of 12 fuel rods was calculated with a three dimensional thermal analysis code, and the temperature difference was found to be small.