ASSESSMENT OF THE CATHARE 1D PUMP MODEL

The development of an advanced model to determine the dynamic pump per formance under two-phase flow conditions is presented. This model is i ncluded in CATHARE 2, version V1.3. It is based on the two-fluid six-e quation CATHARE model which describes the mechanical and thermal non-e quilibria. In a previous review (P. Van den Hove and G. Geffraye, The CATHARE code - one-dimension pump model, Fifth Int. Topical Meet. on N uclear Reactor Thermal Hydraulics (NURETH-5), Salt Lake City, USA, Sep tember, 1992), various calculations were presented concerning Eva sing le-phase and two-phase steam-water test results in the first three qua drants. Here, the range of assessment of the first quadrant is enlarge d with Eva air-water tests and Bethsy pump steam-water tests. Both pum ps are mixed flow pumps, the Bethsy one being radial at the impeller o utlet. Some improvements suggested in the above cited paper are tested against all single-phase liquid, single-phase vapor, two-phase steam- water, and two-phase air-water data in the first quadrant. They concer n a new deviation model and head losses model, and the model of mechan ical interaction between phases.