OS6-1 液単相流配管のオリフィス下流域の減肉検査領域の検討(OS6 設備診断・運用保全技術,循環型社会における動力エネルギー技術)

概要

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Flow visualization experiments were conducted to observe the flow characteristics at orifice downstream, related to pipe wall thinning phenomena in power plant piping systems, especially for flow accelerated corrosion (FAC). Effect of orifice contraction ratio on reattachment points of flow separation was investigated. Reattachment length from the orifice was able to be expressed universally by using non-dimensional length divided by orifice height. With this method of evaluation, flow separation region would be within 3 times of diameter (3.0D), at the utmost, even with largest Reynolds number condition in actual plant piping. Since FAC susceptible area is assumed to be in the separation region, from previous studies, 3.0D) would be conservative enough, for pipe wall inspection region at orifice downstream, which is the regulated value in the current pipe wall thinning management standard for domestic nuclear power plants.
社団法人日本機械学会の論文
2007-06-13