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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제42권 제5호
발행연도
2010.1
수록면
568 - 575 (8page)

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Flow Accelerated Corrosion is an active degradation mechanism of CANDU feeder. The tight bend downstream to Grayloc weld connection, close to reactor face, suffers significant wall thinning by FAC. Extensive in-service inspection of feederwall thinning is very difficult because of the intense radiation field, complex geometry, and space restrictions. Developmentof a knowledge-based inspection program is important in order to guarantee that adequate wall thickness is maintainedthroughout the whole life of feeder. Research results and plant experiences are reviewed, and the plant inspection databasesfrom Wolsong Units One to Four are analyzed in order to support developing such a knowledge-based inspection program.The initial thickness before wall thinning is highly non-uniform because of bending during manufacturing stage, and thethinning rate is non-uniform because of the mass transfer coefficient distributed non-uniformly depending on local hydraulics.It is obvious that the knowledge-based feeder inspection program should focus on both fastest thinning locations and thinnestlocations. The feeder wall thinning rate is found to be correlated proportionately with QV of each channel. A statistical modelis proposed to assess the remaining life of each feeder using the QV correlation and the measured thicknesses. W-1 feedersuffered significant thinning so that the shortest remaining life barely exceeded one year at the end of operation beforereplacement. W-2 feeder showed far slower thinning than W-1 feeder despite the faster coolant flow. It is believed that slowerthinning in W-2 is because of higher chromium content in the carbon steel feeder material. The average Cr content of W-2feeder is 0.051%, while that value is 0.02% for W-1 feeder. It is to be noted that FAC is reduced substantially even thoughthe Cr content of W-2 feeder is still very low

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