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Report No.
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Numerical Analysis for electrode temperature increase by current density concentration caused by noble metal accumulation in the glass melter

Sakai, Takaaki; Kawamura, Takumi*; Miura, Akihiko ; Iwasaki, Takashi*

Numerical analysis was performed to investigate the electric current concentration to the contact area between the electrode and the noble metal sediments in the glass melter of Tokai reprocessing center. The maximum temperature was evaluated by the simplified model for the current path. In addition, three dimensional temperature profile inside the electrode was calculated numerically, in order to evaluated the possibility to detect the temperature increase by the thermo-couple which settled in the electrode. As a result, current density in the melter showed high concentration at the contact area between the electrode and the sediments. It was found that the maximum temperature at the current path had a possibility to increase more than melting temperature of 1360 Centi-grade. In addition, the thermo-couple inside the electrode scarcely showed sensitivity to the melting temperature at the edge of the electrode header where the failure might occur. In conclusion, the possibility of the electrode melting by the temperature increase can not be excluded as a cause of the failure.

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