C212 静的電気化学解析と動的酸化皮膜成長解析を結合したモデルによるPWR給水系配管の減肉評価(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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In order to evaluate pipe wall thinning due to flow accelerated corrosion (FAC), FAC evaluation methods based on the coupled FAC model of static electrochemistry analysis and oxide layer growth analysis has been proposed. Applicability and accuracy of the FAC evaluation methods has been confirmed by comparing wall thinning rates calculated with the proposed methods with those measured for the secondary piping of a PWR plant. And then, it was confirmed that calculated wall thinning rates agreed with the measured ones within a factor of 2. The effects of water chemistry on corrosion rates were evaluated with the methods and the minimum oxygen concentration was calculated for suppressing corrosion rate. As a result of suitable amount of oxygen injection at the suitable location of the feed water line, whole region along the feed water line could be controlled out of corrosive conditions without any serious effects on SG corrosion.
一般社団法人日本機械学会の論文
2010-06-20