High-Cycle Thermal Fatigue in Mixing Zones: Investigations on Heat Transfer Coefficient and Temperature Fields in PWR Mixing Configurations

摘要: Piping systems of nuclear power plants include connections branches conveying fluids at different temperatures. Thermal-hydraulic fluctuations arising from the turbulent mixing flows can affect inner wall pipes and lead to fatigue damage. In order assess high-cycle thermal damages risks NPP zones, knowledge temperature heat transfer fluid structure is necessary. have a better loadings in several kinds zones NPP, multi-annual R&D program has been initiated by EDF, AREVA CEA. The experimental uses two representative small-scale mock-ups which are called “Skin Fluid” “Stainless Steel FATHERINO”, for configurations. very thin ones, made brass material, allowing visualization with an infrared camera field zone, minimized attenuation. As consequence, allow detecting areas interest zone. FATHERINO” then used evaluate quantitatively coefficient 304L stainless steel 9.5mm thick. instrumented specific sensors named “Coefh”. These measuring simultaneously time-histories thus determining coefficient. This paper describes approach load zones. example, application this equal T-junction presented hereafter.Copyright © 2010 ASME