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In this paper we investigated reflux condensation in a single pressurized water reactor steam generator tube in the presence of non-condensable gases. We observed the gas plug formation, behavior and impact on heat removal under thermo-hydraulic conditions typical for the LOCA stage during which the reflux condenser regime is characteristic. We used nitrogen and helium to observe differences of the plug behavior for heavy and light gases. Measurements reveal that the non-condensable gas type plays a crucial role in the plug formation. Light gas (He) forms sharp and narrow interface and limits condensation efficiently while heavy gas (N2) develops wide, diffuse interface with gradual temperature drop.

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