Thermal physics experiments for interpretation the diagnostic rod bundle measurements

In order to prepare in-reactor measurements and following result interpretation a series of preliminary experiments has been run. These experiments were performed both with one- and two-phase flow on a thermal-hydraulic test facility in CIPR. The diagnostic equipment was approbated and thermal-hydraulic noise analyzed for the processes to be studied within the scope of the research programme on Rheinsberg NPP. The experimental results proved the feasibility of the subcooled boiling start-up registration via the temperature noise intensity and pressure fluctuations measurements. A criterion has been found for two-phase flow regimes identification