Thermalhydraulic behaviour of a passive pressure pulse transmitter

The boiling water reactor SWR-1000 will have a fundamentally higher level o f safety by use of passiv safety systems. The Passive Pressure Pulse Transm itter (PIG) as one of these systems can trigger switching signals at sinkin g water-level in the primary circulation loop without the supply of additio nal energy. A PIG was designed at TU Dresden and integrated into the test f acility Danton to examine his thermal hydraulic behaviour experimentally. T he processes of condensation and evaporation during the passage of water-le vel through the PIG are relatively: complicated in their temporal sequence. One problem is the sudden condensation if the steam enters the cold PIG. D ifferent variants on the recession of this condensation effect as well as t he influence of different parameters on the characteristic of switching sig nals were examined in a variety of experiments.