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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

CORE THERMAL RESPONSE AND MASS DISTRIBUTION DURING VESSEL MASS DEPLETION ASSOCIATED WITH A SBLOCA

Get access (open in a dialog) DOI: 10.1615/IHTC8.3400
pages 2523-2527

Résumé

Experimental results are presented involving core thermal-hydraulic response during a small break loss-of-coolant accident (SBLOCA) simulation performed in the Semiscale Mod-2C facility. The experiments were performed at high temperatures and pressures with initial conditions typical of a pressurized water reactor (15.6 MPa pressure; 600 К hot leg fluid temperature). The Mod-2C facility represents the state-of-the-art in measurement of in-core average channel fluid density at several elevations which allows an estimate of the axial void fraction distribution during the transient. The void fraction distribution is quantified for two major liquid level depressions associated with SBLOCA response. The first level depression was relatively rapid (25 s) and had multi-dimensional heatup effects which suggest falling films of liquid on the rod surface. The second level depletion with a much slower rate (250 s) had no multidimensional effects (an orderly top-down heatup of rod positions was observed).