Development of debris filtering bottom nozzle for Korean LWR fuel

In this study, the debris filtering bottom nozzle which prevents metallic debris from entering into fuel assembly was developed. In order to apply the developed bottom nozzle to the fuel assembly for Korean Standard Nuclear Plant (KSNP), 9 types of bottom nozzle which have compatibility with other fuel assembly components, manufacturability in addition to debris filtering capability were proposed and evaluated for structural integrity, debris filtering capability and hydraulic pressure loss point of view. Based on the analysis results, optimum bottom nozzel has been selected. The selected bottom nozzle has showed superior performance for the functional requirememts such as debris filtering capability, structural integrity and less pressure drop compared with the conventional bottom nozzle for KSNP