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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제49권 제7호
발행연도
2017.1
수록면
1,524 - 1,536 (13page)

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During the fabrication process of reactor vessel head penetration (RVHP), the grain size of the tubematerial can be changed by hot or cold work and the inner side of the tube can also be shrunk due towelding outside of the tube. Several nonregular time-of-flight diffraction (TOFD) signals were foundbecause of deformed grains. In this paper, an investigation of nonregular TOFD indications acquired fromRVHP tubes using experiments and computer simulation was performed in order to identify anddistinguish TOFD signals by coarse grains from those by Primary Water Stress Corrosion Crack (PWSCC). For proper understanding of the nonregular TOFD indications, microstructural analysis of the RVHP tubesand prediction of signals scattered from the grains using Finite Element Method (FEM) simulation wereperformed. Prediction of ultrasonic signals from the various sizes of side drilled holes to find equivalentflaws, determination of the size of the nonregular TOFD indications from the coarse grains, and experimentalinvestigation of TOFD signals from coarse grain and shrinkage geometry to identify PWSCCsignals were performed. From the computer simulation and experimental investigation results, it was possible to obtain thenonregular TOFD indications from the coarse grains in the alloy 690 penetration tube of RVHP; thesenonregular indications may be classified as PWSCC. By comparing the computer simulation and experimentalresults, we were able to confirm a clear difference between the coarse grain signal and thePWSCC signal.

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