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• The ELSMOR facility has been built to test a passive heat removal system. • ELSMOR test 00099_C has been selected to perform a code benchmark. • AC2, APROS, CATHARE, RELAP and TRACE codes have been adopted. The EU-funded ELSMOR (Towards European Licencing of Small Modular Reactors) project seeks to design methods and tools for stakeholders to assess and verify Light Water SMRs' safety when installed across Europe. Within the project, an experimental facility has been built at SIET (Piacenza, Italy) to test a passive heat removal system. The passive system is based on natural circulation, with a plate-type Compact Steam Generator (CSG) as heat source and an in-pool condenser as heat sink. An experimental campaign has been conducted to investigate the effect of different parameters on the passive system behavior (e.g. secondary side filling ratio, primary system temperature, pool level, presence of non-condensable gases, etc.). Among the various tests, ELSMOR test 00099_C has been selected to perform a code benchmark and ten parameters were selected for the code comparison. The chosen test explores the effect of the secondary side filling ratio from 60.16% to 24.96%. In the benchmark, the codes from the European reference chains have been applied, Apros by VTT, AC2 by GRS and CATHARE by CEA, and they have been compared with the results obtained with RELAP5 by ENEA and TRACE by PSI. In general, all the codes were able to predict the experimental data both from a qualitative and quantitative point of view. The main discrepancies have been observed in some results for the prediction of the secondary side pressure, secondary side CSG inlet temperature and secondary side flow rate. [ABSTRACT FROM AUTHOR]