150℃에서 원전 2차측 배관재료의 Cr함량에 따른 유체가속부식 특성
Effect of Cr content on the FAC of pipe material at 150℃
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Flow accelerated corrosion (FAC) of the carbon steel piping in nuclear power plants (NPPs) has been majorissue in nuclear industry. During the FAC, a protective oxide layer on carbon steel dissolves into flowingwater leading to a thinning of the oxide layer and accelerating corrosion of base material. As a result,severe failures may occur in the piping and equipment of NPPs. Effect of alloying elements on FAC ofpipe materials was studied with rotating cylinder FAC test facility at 150℃ and at flow velocity of 4m/s. The facility is equipped with on line monitoring of pH, conductivity, dissolved oxygen(DO) and temperature. Test solution was the demineralized water, and DO concentration was less than 1 ppb. Surface appearanceof A 106 Gr. B which is used widely in secondary pipe in NPPs showed orange peel appearance, typicalappearance of FAC. The materials with Cr content higher than 0.17wt.% showed pit. The pit is thoughtto early degradation mode of FAC. The corrosion product within the pit was enriched with Cr, Mo, Cu,Ni and S. But S was not detected in SA336 F22V with 2.25wt.% Cr. The enrichment of Cr and Mo seemedto be related with low, solubility of Cr and Mo compared to Fe. Measured FAC rate was compared withDucreaux’s relationship and showed slightly lower FAC rate than Ducreaux’s relationship.
Abstract
Flow accelerated corrosion (FAC) of the carbon steel piping in nuclear power plants (NPPs) has been majorissue in nuclear industry. During the FAC, a protective oxide layer on carbon steel dissolves into flowingwater leading to a thinning of the oxide layer and accelerating corrosion of base material. As a result,severe failures may occur in the piping and equipment of NPPs. Effect of alloying elements on FAC ofpipe materials was studied with rotating cylinder FAC test facility at 150℃ and at flow velocity of 4m/s. The facility is equipped with on line monitoring of pH, conductivity, dissolved oxygen(DO) and temperature. Test solution was the demineralized water, and DO concentration was less than 1 ppb. Surface appearanceof A 106 Gr. B which is used widely in secondary pipe in NPPs showed orange peel appearance, typicalappearance of FAC. The materials with Cr content higher than 0.17wt.% showed pit. The pit is thoughtto early degradation mode of FAC. The corrosion product within the pit was enriched with Cr, Mo, Cu,Ni and S. But S was not detected in SA336 F22V with 2.25wt.% Cr. The enrichment of Cr and Mo seemedto be related with low, solubility of Cr and Mo compared to Fe. Measured FAC rate was compared withDucreaux’s relationship and showed slightly lower FAC rate than Ducreaux’s relationship.
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