BWR REGIONAL INSTABILITY ANALYSIS BY TRAC/BF1-ENTREE-I: APPLICATION TO DENSITY-WAVE OSCILLATION

摘要

In this study, applicability o the TRAC/BF1-ENTREE CODE TO REGIONAL INSTABILITY WAS DEMONSTRATED N TWO PARTS. In Part I, fidelity of numerical models was studied with Regard to the density-wave oscillation. Based on the FRIGG-4 loop test, predictability of the code has been Demonstrated. An appropriate time integration scheme Was explored, and it was found that the numerical vis- Cosity can be minimized by applying the semi-implicit method and specifying the material Courant number close To unity.