This project has received funding from the European Union's Horizon 2020 research and innovation programme under agreement No 945275

The last two experiments in the frame of work package 3 of the PASTELS project were successfully conducted at the PKL test facility in winter 2022/2023. Test P2.1 replicated a cool-down transient under extended loss-of AC-power (ELAP) conditions and demonstrated the employment of the SACO as the ultimate heat sink for the cool-down of the plant. Test P2.2 further extended the database for validation of codes and validation models by the provision of experimental data on maximum SACO heat removal power for different fill levels inside the SACO straight tubes. By means of a parameter study with phases of steady-state operation of the facility and stepwise variation of fill levels inside the SACO straight tubes in between individual phases, test P2.2 explored the maximum heat removal capacity of the SACO for a given SACO straight-tube fill level.