Validation of simulation code for flow instability in steam generator of fast breeder reactor

Yoshikawa, Ryuji  ; Ohshima, Hiroyuki

A computer code to analyze flow stability in water-side of steam generator was developed with drift-flux model. The semi-implicit numerical scheme was used, and the flow equations were differenced over the staggered mesh. The total flow rate and the temperature of water flowing into the inlet plenum, the pressure of outlet plenum, and the heat flux through the heat transfer tube were given as boundary conditions for the simulation of water-side flow. The computer code was validated by the simulation of flow instabilities in two parallel channels and comparison with experimental results. The capability of the computer code on prediction of flow oscillation and stable boundary in two parallel channels was confirmed. The sensitivity analysis was also carried out to quantify the impacts of some important parameters on oscillation period and the stable boundary.