Study on coolant behavior in damaged core of sodium-cooled fast reactor, 4; Evaluation of pressure drop through simulated debris bed in consideration of porosity distribution

Kurisaki, Tatsuya*; Ito, Daisuke*; Ito, Kei*; Saito, Yasushi*; Imaizumi, Yuya ; Matsuba, Kenichi  ; Kamiyama, Kenji  

The pressure loss of two-phase flow in debris bed is one of the important factor for coolability evaluation of the inplace-cooling for the residual core-materials in the severe accident of sodium-cooled fast reactors. Although Lipinski model is already proposed for the pressure loss evaluation, the accuracy would decrease when the porosity is not homogeneous. Thus, the evaluation method by dividing the cross section was developed for the two-phase flow in packed bed of non-homogenious porosity, and compared the calculated values with experimental data for the validation.