Simulation of two surge line break experiments at the PMK-2 Test Facility using the code ATHLET


Simulation of two surge line break experiments at the PMK-2 Test Facility using the code ATHLET

Schäfer, F.; Krepper, E.; Prasser, H.-M.; Szabados, L.; Ezsöl, G.

Results of two surge line break experiments, which were conducted at the PMK-2 test facility, are presented. The thermo-hydraulic computer code ATHLET, which was developed by GRS (Gesellschaft für Anlagen- und Reaktorsicherheit) mbH, was used for post-test calculations. The experiments simulate a break of the pressurizer surge line in the hot leg of a VVER-440-type reactor with different injection modes from the ECC systems. The main phenomena of the experiments are discussed and in case of selected events a more detailed interpretation with help of the measured void fraction, obtained with a special measurement device, is given. The results of the experiments and the ATHLET calculations are compared. In both experiments natural circulation instabilities could be observed. The physical mechanisms of the instabilities are discussed and it could be shown, that ATHLET can calculate the instabilities in good agreement with the experimental data.

Keywords: Thermo-hydraulics; Simulations; Instabilities; ATHLET

  • Lecture (Conference)
    Annual Meeting on Nuclear Technology, May 14-16, 2002, Stuttgart, Germany
  • Contribution to proceedings
    Annual Meeting on Nuclear Technology, May 14-16, 2002, Stuttgart, Germany

Permalink: https://www.hzdr.de/publications/Publ-4258
Publ.-Id: 4258