Thermodynamic evaluation of molten-core concrete interaction

北垣 徹; 池内 宏知; 矢野 公彦; 荻野 英樹; 鷲谷 忠博

no journal, , 

Solidification phenomena on the mixture of molten-core and concrete are discussed based on thermodynamic equilibrium calculation. Phase equilibria during solidification from melting temperature were calculated by FactSage 6.2 and NUCLEA database. In the equilibrium and low oxygen condition, (U,Zr)O, (Zr,U)SiO and CaAlSiO are formed in sequence from liquidus temperature. On the other hands, in the quench condition estimated by scheil cooling model, the amount of (Zr,U)SiO is limited. This indicates that ZrO is separated from (U,Zr)O, it reacts with SiO and (Zr,U)SiO is produced. Moreover, in the high oxygen potential condition, thermodynamic calculation shows that (Zr,U)SiO is immediately formed just below liquidus temperature. The formation behavior of (Zr,U)SiO and CaAlSiO is the key factor on solidification phenomena and effects to the estimation of MCCI phenomena.