H2020-SESAME CIRCE-ICE and HERO

CIRCE-ICE thermal stratification

•A numerical activity, aimed at assessing the RELAP5-3D© capability to reproduce the main thermal-hydraulic phenomena in an HLM pool-type facility, in different operative conditions, is presented. An experimental campaign promoted in the CIRCE-ICE test facility at ENEA-Brasimone was used for the validation.

•The comparison between the simulation results and the experimental data confirmed the capability of the code to reproduce the thermal-hydraulics of the main flow path.

•The analysis of the pool thermal-hydraulics has highlighted a more accurate result adopting the three-dimensional nodalization scheme

CIRCE-HERO Thermal stratification results

VALIDATION BENCHMARK RELAP5-3D

•Uniform temperature at the same axial level according experimental data

•Relevant thermal stratification observed between 5000 and 6000 mm (SG outlet). Good prediction by R5-3D

•Largest amount of heat losses from FPS and fitting volume highlighted by simulations