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PRELIMINARY THERMAL HYDRAULIC ANALYSIS OF HYPER FUEL ASSEMBLY USING MATRA

Sub-channel analysis of HYPER fuel assembly was performed using MATRA which is a subchannel analysis code developed by KAERI based on COBRA-IV-I. The MATRA code was considered for comparison between codes and assessing the capability of overcoming the limitation of the SLTHEN code used in the previous works. Two types of single fuel assembly, i.e., average assembly and hot assembly were considered for the present work. The predicted peak cladding temperatures of the average and hot assemblies were 536.2°C and 653.8°C, respectively with the reference design parameters. The comparison of results obtained by two codes shows that there is a good agreement for the predicted thermal hydraulic behaviour. It is judged that MATRA as well as SLTHEN is a very useful tool for thermal hydraulic design of the HYPER core and MATRA can be used to make up for the limitation of SLTHEN.