This work, carried out in the frame of the THINS Project (FP7-EC), deals with the analysis of the first experimental tests performed to investigate mixed convection and stratification phenomena in a large pool, in safety relevant scenarios such as the transition from nominal flow to natural circulation regime, typical of Decay Heat Removal (DHR) conditions. In particular, the experimental campaign was designed to study the PLOHS+LOF accident, with decay heat removed by the DHR-system. The CIRCE pool facility has been updated to host a suitable test section in order to reproduce the thermal-hydraulic behavior of a HLM pool-type reactor. The test section basically consists of an electrical bundle (FPS) made up of 37 pins arranged in a hexagonal wrapped lattice. This paper reports the experimental data as well as a preliminary discussion and analysis. Temperatures along three cross sections of the FPS were reported and the Nusselt number in the FPS sub-channels was investigated. Moreover, the thermal stratification and mixing into the pool has been monitored during the steady state and transient conditions during the experiment.
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