PWR1次冷却水環境下でのマグネタイト生成メカニズム等に関する検討

英字タイトル:
Investigation on magnetite formation mechanism in PWR primary coolant system environment
著者:
井門賢一中川和重（四国電力）山本松平（四国総研）大鹿浩功（四国電力）
発刊日: 2021年7月 6日
公開日: 2021年9月30日

カテゴリ: 第17回

キーワードタグ:
corrosiondrive shaftIkata Unit3magnetiteprimary coolant systemSUS410

概要

Inadvertent withdrawal of a control rod cluster was observed during lifting of the upper core structure on the 15th outage of Ikata Unit3. The source of magnetite sludge, which is one of the causes of this event, was presumed to be the drive shaft, but there is little knowledge about the corrosion characteristics of the drive shaft material SUS410 in the PWR primary water. Therefore, we investigated the corrosion characteristics of SUS410 in simulated PWR primary water circumstance at the plant start-up stage. As a result, magnetite was mainly observed in the corrosion product of SUS410; It strongly suggests that the causal magnetite sludge originates in the SUS 410 corrosion products.