Analysis of B_4C Influences on Thermodynamic Properties and Phase Separation of Molten Corium with Ionic Liquid U-Zr-Fe-O-B-C-FPs Database

概要

論文の詳細を見る
Boron carbide influences on thermodynamic properties and phase separation of molten corium such as liquidus temperature were estimated with our U-Zr-Fe-O-B-C-FPs thermodynamic database. The liquidus temperature of the oxide for the typical corium was estimated to increase by a hundred degrees with B4C addition when the corium included up to 10 wt% Fe. On the other hand, the liquidus temperature was hardly changed when the corium included 50 wt% Fe. The interaction temperature between the steel and the corium with B4C was estimated at 1130 K. We define the interaction temperature as the lowest temperature where the solid Fe and the liquid phase of a corium are in equilibrium, at which interactions such as microstructure change of the vessel were observed in test studies. Although it is 180 K lower than that without B4C, the estimated temperature is still over 200 K higher than the criterion temperature where the vessel loses its structural strength, which has been used in the feasibility evaluation of the in-vessel retention. Other thermodynamic influences of B4C were also estimated as not having a negative impact on the in-vessel retention.
2009-07-01