Natural circulation experiments At the ISB-VVER integral test Facility and calculations using The thermal-hydraulic Code athlet

摘要

In 1995 at the integral test facility ISB-VVER in Elek- trogorsk near Moscow, natural circulation experiments were performed that were sicentifically supported by the Forschungszentrum Rossendorf. These experiments were The first of this kind at a test facility that models VVER- 1000 thermal hydraulics. Using the code ATHLET, which is being developed by Gesellschaft fur Analgen-und Reak- torsicherheit, pre- and posttest calculations were done to determine the thermal-hydraulic events to be expected and to define and tune the boundary conditions of the test.