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Report No.
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Assessment of corrosion behavior of carbon steel overpack weld in oxidizing environment

Yokoyama, Yutaka*; Takahashi, Rieko*; Asano, Hidekazu*; Taniguchi, Naoki ; Naito, Morimasa 

In order to clarify the corrosion behavior of overpack weld at the initial stage of repository, immersion tests were carried out in oxidizing environment and following results were obtained;(1) Selective corrosion was prone to occur at welded metal of TIG and MAG welding. It is possible that the welded metal has affected by the composition in filler material used in welding and by the change of microstructure at welded zone. (2) According to the results of extreme value statistical analysis, estimated corrosion depths by the selective corrosion at welded metal did not exceed the maximum corrosion depth evaluated in the past lifetime assessment of overpack.

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