Abstract
Thermal-hydraulic characteristics of the decay heat removal system (DHRS) has been evaluated by both a water test and its computational analysis. The direct reactor auxiliary cooling system (DRACS) was studied as a representative DHRS in the LMFBR design. A natural circulation flow of the DRACS is originated from the buoyancy force balanced with the pressure loss within the active core. Hence it appears that the performance of the DRACS could be fully estimated by the thermal-hydraulic study of one fuel sub-assembly under the condition of low flow rate. The inter-wrapper flow ocurring in the gap between core sub-assemblies under the natural circulation operation might have a large capacity to cool the core. An inverse flow ocurring at the outer region of the core was due to the cooling effect of the inter-wrapper flow.
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