Influence of Azimuthal and Axial Non-Uniformities of Fuel Clad Straining on WWER Type Assembly Flow Area Blockage under Accident Conditions

摘要

The efficiency of provisions against accident situations at WWER NPP due to the depressurization of the primary circuit is in many respects dictated by the conditions of filling in the core from the system of emergency cooling. Therefore, it is important that the fuel clad ballooning in the process of an accident should not significantly block the flow area of fuel assemblies or critically impair their cooling. This paper discusses the influence of fuel clad straining on the blockage in WWER type assemblies and is a further evolution of investigations in this direction. (ERA citation 12:016021)