Studies on Transient Void Behaviors during Power Input Simulating Reactivity Accident (2nd Report: Modeling and Numerical Analysis)

摘要

Reactivity accident due to a withdrawing of control rod during hot waiting condition is the most severe one in LWR In such an accident, void by transient boiling works to suppress a reactivity insertion. In the 1st study, transient void behaviors were experimentally investigated in the various conditions of power inputs, subcooling and pressure. In this study, a modeling and numerical analysis which include bubble boundary layer and turbulent model caused by boiling bubble cycle are proposed to explain experimental results in the various conditions.