[en] Through performance testing of a pilot-scale melter, the authors have confirmed that certain items are especially important in applying the liquid-fed ceramic melter to commercial-scale vitrification. Pilot-scale melter was designed and fabricated based on the melter technology developed by Power Reactor and Nuclear Fuel Development Corporation (PNC). The electrode power supply data were compared from two different start-up operations using the glass cullets with and without noble metals. And the comparison showed almost no difference between main electrode resistances regardless of the presence or absence of noble metals. Sugar was added to the liquid waste feed to cause the exothermic reaction during glass formation reaction at cold cap.It increased the melting efficiency following to the addition rate. Glass-draining operations were performed, and stable and smooth glass flow was obtained