| The safety analysis of CANDU (CANada Deuterium Uranium) reactors includes postulated accident scenarios in which a steam-water mixture is to be present in the headers and the feeders (components of the CANDU heat-transport system). Knowledge of phase and liquid distribution in the headers and feeders is essential to predict behaviour of the reactor under LOCA conditions.;In the present study, an experimental flow loop was designed and constructed to investigate the two-phase flow distribution in a simulated CANDU header-feeder system.;The header in this experiment, made of a transparent material, was a scaled-down version of the one used in Kowalski and Krishnan (1987) using a scaling ratio of approximately 8.5:1. Experiments were conducted using air-water mixtures at room temperature and a nominal header pressure of 170.3 kPa (abs). The test matrix included one- and two-turret injection, two inlet water flow rates (15 and 30 kg/min) and four different air flow rates for each water flow rate, giving inlet qualities of 3%, 1.5%, 0.75% and 0.375%. The outlet flow rates of air and water were measured in all the feeders under the condition of equal pressure drop across the feeders. (Abstract shortened by UMI.)... |
