Study on a Numerical Simulation for Thermal-Hydraulic Phenomena of Multiphase, Multicomponent Flows; Transient Vaporization/Condensation Phenomena in Multicomponent System (3)

Morita, Koji*; Matsumoto, Tatsuya*; Fukuda, Kenji*; Yamano, Hidemasa   ; Tobita, Yoshiharu; Sato, Ikkenn 

It is one of important problems for more reliable reactor safety evaluation to improve numerical simulation techniques for involved thermal-hydraulic phenomena of multiphase, multicomponent flows in core disruptive accidents. In the present cooperative research, physical model development and experimental investigation were performed for transient condensation phenomena of a vapor bubble with noncondensable gas to improve applicability of a fast-reactor safety analysis code for the phase-transition phenomena in multicomponent systems. In addition, basic validity of the developed models was demonstrated through the experimental analysis, and then applicability of the fast-reactor safety analysis code was discussed for bubble condensation behaviors under rector conditions.