Verification of the Code ATHLET Based on Data from a Small-leak Experiment Conducted at the ISB-VVER Stand

The results of verification of the thermohydraulic code ATHLET (Germany) using experimental data for an accident with small-leakage (2.4%) from the inlet plenum (the downcomer) of the ISB-VVER-1000 integral stand are presented; here, the circulation pumps are shut down, and high-pressure water is injected into an undamaged loop.