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Report No.
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Development of a coarse-mesh subchannel CFD model for prediction of core thermal-hydraulics in natural circulation conditions

Hamase, Erina ; Miyake, Yasuhiro*; Imai, Yasutomo*; Doda, Norihiro  ; Ono, Ayako ; Tanaka, Masaaki  

To enhance the safety of sodium-cooled fast reactors, the natural circulation (NC) decay heat removal systems with a dipped-type direct heat exchanger (D-DHX) have been investigated. During the D-DHX operation, since the core-plenum interaction occurs, the reactor vessel model using a computational fluid dynamics code (RV-CFD) is required to be established. Previously, the CFD model based on the subchannel analysis was developed. In this study, to achieve lower computational cost maintaining the prediction accuracy, the coarse-mesh subchannel CFD (CMSC) model was developed, and was incorporated into the core of RV-CFD. As a result of PLANDTL-1 test analysis, the RV-CFD with the CMSC model can reproduce the core-plenum interaction under NC conditions.

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