Inscrição na biblioteca: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

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

Transient Thermal Mixing In A Model PWR Downcomer And Attached Cold Leg With Simulated High Pressure Injection

Get access (open in a dialog) DOI: 10.1615/IHTC8.3360
pages 2497-2503

Resumo

This paper describes a series of tests investigating transient cooldown in a transparent model of a PWR cold leg with High-Pressure Injection (HPI) and a downcomer. Test conditions were selected to cover a wide range of mixing phenomena expected to occur in a prototypical reactor geometry in the absence of primary loop flow. Results include transient temperature and conductivity data, and a description of the cold leg mixing phenomena.

Density differences between the HPI water and the system inventory water were caused by differences in temperature and/or salt addition to HPI water. Comparisons of these tests indicate that molecular diffusion is negligible and mixing is dominated by convection. It was also found, for a wide range of HPI flows and density ratios that the temperature distribution on the pressure vessel side of the downcomer below the cold leg elevation was generally uniform and near the fluid mean temperature.