C213 液滴衝撃加速型腐食による局所配管の減肉評価手法(配管減肉評価法(1),OS5 保全・設備診断技術),動力エネルギーシステム部門20周年,次の20年への新展開)

概要

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Local wall thinning identified at steam pipe of nuclear power plants is mainly led by the interaction, of liquid droplets in steam flow and pipe wall, which can be divided into two types, one is mechanical effect oriented and the other is corrosion effect oriented. For higher droplet collision velocity than 200 m/s, wall thinning rate is determined mainly by erosion (LDI (mechanical)), while for lower velocity, it is determined by corrosion process (LDI (corrosion)). The flow pattern of liquid droplets was calculated firstly, and then, their collision velocity was determined. For LDI (mechanical) evaluation, Heymann's formula for droplet induced erosion was applied, while for LDI (corrosion) evaluation, the frequency of oxide film rupture due to droplet collision was calculated and then FAC evaluation methods based on the coupled model of static electrochemical analysis and dynamic oxide layer growth analysis were applied for corrosion calculation.
一般社団法人日本機械学会の論文
2010-06-20