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51313-02611-Methodology for Estimating of Flow-Accelerated Corrosion Rates

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Product Number: 51313-02611-SG
ISBN: 02611 2013 CP
Author: Pavan Shukla
Publication Date: 2013
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Flow-Accelerated Corrosion (FAC) problems are encountered frequently in different components of both the primary and secondary cooling circuits of a pressurized water reactor as well as in boiling water reactor nuclear power plants (NPPs). Several existing tools are available to predict FAC rates for simplified configurations such as flow through straight pipes based on empirical correlations. Their predictive capability is however limited for relatively complex configurations such as pipe joints T-sections and sudden expansions. These configurations are widely encountered in NPPs and are more susceptible to FAC. To reasonably estimate FAC rates in such geometries a detailed local and spatial resolution of flow and chemistry are required. This can be achieved by performing a detailed computation of the flow that accounts for chemical reaction and geometric complexity. The detailed flow field can subsequently be used to compute material loss rate due to corrosion. The paper will present a methodology where computation fluid dynamic model is used to estimate mass-transfer boundary layer through a bend. This is coupled with the electrochemical kinetic model of electrochemical reactions governing corrosion of the pipe materials. The kinetic model is solved to estimate corrosion rate as a function of bend geometry and carrier fluid chemistry. Detailed results will be presented from various bend geometries and process conditions.

Flow-Accelerated Corrosion (FAC) problems are encountered frequently in different components of both the primary and secondary cooling circuits of a pressurized water reactor as well as in boiling water reactor nuclear power plants (NPPs). Several existing tools are available to predict FAC rates for simplified configurations such as flow through straight pipes based on empirical correlations. Their predictive capability is however limited for relatively complex configurations such as pipe joints T-sections and sudden expansions. These configurations are widely encountered in NPPs and are more susceptible to FAC. To reasonably estimate FAC rates in such geometries a detailed local and spatial resolution of flow and chemistry are required. This can be achieved by performing a detailed computation of the flow that accounts for chemical reaction and geometric complexity. The detailed flow field can subsequently be used to compute material loss rate due to corrosion. The paper will present a methodology where computation fluid dynamic model is used to estimate mass-transfer boundary layer through a bend. This is coupled with the electrochemical kinetic model of electrochemical reactions governing corrosion of the pipe materials. The kinetic model is solved to estimate corrosion rate as a function of bend geometry and carrier fluid chemistry. Detailed results will be presented from various bend geometries and process conditions.

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