ICONE19-43751 RESULTS OF THE LIVE-L6 EXPERIMENT ON MELT BEHAVIOR IN THE RPV LOWER HEAD

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To complement the experimental data on melt pool behaviour in the vessel lower head Karlsruhe Institute of Technology (KIT) performs large-scale tests through the LIVE program. The objective of the LIVE-L6 experiment was to investigate the thermal hydraulic behavior of stratified melt pool in the reactor vessel lower head. In the test two melt layers were simulated: the lower with heat generation and the upper unheated layer. Both layers were composed of a non-eutectic melt (KNO_3-NaNO_3) as a simulant fluid. The layers were separated by a 2 mm thick copper plate which was located at 333 mm vessel height. In the homogeneously heated lower part of the melt pool several power plateaus were realized, starting from 18 kW, stepwise reduction to 5 kW and then increase of the power again to 18 kW. At each power plateau steady-state conditions were reached. The outer surface of the vessel was cooled with water. Besides the transient behavior, for which the LIVE-L6 test provides qualified data on temperature evolution in the molten pool and heat transfer from the lower melt layer to the upper part of the melt, the experiment addresses other important phenomena, such as the local distribution of heat flux, and the influence of solidification on the thermal-hydraulics of the pool, i.e. the possible existence of a mushy region and its impact on the heat transfer. In the post-test analysis crust thickness profile along the vessel wall, the crust composition and the morphology were determined. The LIVE-L6 experimental results are being used for the assessment of correlations and development and validation of mechanistic models for the description of molten pool behavior. The paper summarizes the objectives of the LIVE program and the main results obtained in the LIVE-L6 experiment.

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