Der passive Notkondensator des SWR-1000 : Test und Berechnung

Siemens AG is developing the new innovative boiling water reactor concept SWR-1000. New features are the passive safety systems (e.g. emergency condensers, building condensers, passive pressure pulse transmitters). For the experimental investigation of the emergency condenser effectiveness, the Noko test facility has been constructed at the Forschungszentrum Julich in cooperation with Siemens. The facility has an operating pressure of 10 MPa and a maximum power of 4 MW for steam production. The condenser bundle consists of 8 tubes and is fabricated with the geometry and material as planned for the SWR. In more than 200 experiments, the emergency condenser capacity was tested as a function of pressure, water level and concentration of non-condensables in the pressure vessel as well as pressure, water level and temperature in the condenser. Posttest calculations of Noko experiments were performed with an improved version of Athlet. To calculate the heat transfer coefficients during condensation in horizontal tubes the module Konwar has been developed and implemented in Athlet. Konwar is based on the flow regime map of Tandon and includes several semi-empirical correlations for the determination of the heat transfer coefficients. The presented comparison between calculations and experiments shows a good agreement.