Abstract
One of the problems encountered in the HTTR design was the air cooling design on stand pipe (SP) used for control rod. Control rod drive mechanism (CRDM) is installed in the control rod SP. If the CRDM temperature exceeds 180°C, the CRDM would malfunction because of reduction of the electrical insulation. Therefore we studied proper air cooling method on the control rod SPs by a three-dimensional thermal-hydraulic analysis. The analytical model was validated by comparing analytical results with experimental ones. The flow test was carried out with a 1/2 scale model where air flow around the SPs was visualized. In analyses circular cylindrical SPs were modeled simply by rectangular pillar ones to achieve the equivalent volume. Momentum drop by SP bundle was set for the analyses. Analytical results of air flow around the SPs were in good agreement with experimental ones. Analytical results also showed that five air outlet nozzles at 30°intervals on ring-duct surrounding the SP bundle are selected as proper design condition and the CRDM temperature is well below the limit.
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