Heat-Removal Capability of Steam Generators Under Reflux Cooling Modes in a CANDU-PHT System

Abstract

Reflux condensation in steam generator tubes may be an important heat removal mechanism in certain loss-of-coolant accidents in nuclear power plants, The effects of system pressure, cooling water temperature, length of the single-phase region and tube diameter on the heat removal capacity of a single tube under complete reflux are examined experimentally. Flow regime observations of reflux condensation in a single tube and a four U-tube steam generator model are presented.