INVESTIGATION OF CORE THERMOHYDRAULICS IN FAST REACTORS-INTERWRAPPER FLOW DURING NATURAL CIRCULATION

摘要

A proper assessment of core thermohydraulics un- der natural circulation conditions important so that the full potential of the inherent, passive feature of a the decay heat removal system are operated in the up- per plenum of a reactor vessel, cold sodium exiting the heat exchangers may penetrate into the gap regions be- tween fuel subassemblies; this gap flow between the wrapper tubes of subassemblies is called interwrapper flow (IWF).