Flow Accelerated Corrosion (FAC) is thought to be the origin of the pipe thinning in the pipe of second cooling system of power plants. FAC is a phenomenon that inclined to and promoted the c orrosion because of the increase of the complex turbulent flow behind the orifice. Now the analysis of the mechanism of FAC for maintenance of the nuclear reactor is performed. Although the r ough surface is confirmed over the pipe wall, influence of the shape on the corrosion is not understood at this stage. Therefor...
英字タイトル:
Experimental research on mass flow accelerated corrosion mechanism behind the orifice

Abstract The accident to which the secondary system piping of the Mihama Power Station Unit-3 was damaged in August, 2004 happened. This is due to thinning of the pipe, and it is thought to be flow accelerated corrosion mechanism (FAC). The turbulence kinetic energy is considered as one of the flow factors in FAC. This is because the location where the amount of thinning is large and the parts where the turbulence kinetic energy is high are corresponding comparatively well. However, the causal relation bet...
英字タイトル:
Numerical research on flow accelerated corrosion mechanism behind the orifice-Numerical simulation close to the wall

Flow Accelerated Corrosion (FAC) is one of the issues to be noticed considerably in plant piping management. For the integrity and safety of t he plant, the wall-thinning and thinning rate due to FAC should be clely predicted in pipe wall inspection. In this paper, we study FAC fro m the view point of flow dynamics. The mass transfer coefficient is estimated by the numerical simulation inside the bent. Changing the Reynol ds number, the peak location of mass transfer coefficient and its maxim value is eval...
英字タイトル:
Mass Transfer and Shape Factor in Complicated Flow Field