福島第一原子力発電所6号機における液滴衝撃エロージョンによるタービン抽気配管損傷とその対応について
英字タイトル:
Through wall degradation problem of the turbine extraction steam drain piping due to liquid drop impingement and measures taken for this problem at Fukushima Dai-ichi Nuclear Power Plant Unit 6
著者:
稲垣 武之 Takeyuki INAGAKI 小林 照明 Teruaki KOBAYASHI 島田 森 Shigeru SHIMADA 井上 龍介 Ryousuke INOUE 薄葉 智 Satoshi USUBA 木村 剛生 Takeo KIMURA
発刊日:
公開日:
erosionextraction steam pipingliquid drop impingementloss of materialturbine rotor replacement
Through wall degradation problem of the turbine extraction steam drain piping due to liquid drop impingement and measures taken for this problem at Fukushima Dai-ichi Nuclear Power Plant Unit 6
著者:
稲垣 武之 Takeyuki INAGAKI 小林 照明 Teruaki KOBAYASHI 島田 森 Shigeru SHIMADA 井上 龍介 Ryousuke INOUE 薄葉 智 Satoshi USUBA 木村 剛生 Takeo KIMURA
発刊日:
公開日:
カテゴリ: 論文
キーワードタグ:erosionextraction steam pipingliquid drop impingementloss of materialturbine rotor replacement
概要
Through wall degradation was found on the extraction steam drain piping of Unit 6 of Fukushima Dai-ichi Nuclear Power Plant owned by Tokyo Electric Power Company after replacement of the turbine rotors with those of higher thermal efficiency. The mechanism of this degradation was loss of material due to liquid drop impingement. Since the estimated life time of the piping based on wall thickness measurements before the replacement was at least 9 years, the rapid wall thinning occurred after the replacement. This paper describes a summary of the phenomenon, its degradation mechanism and root cause, a temporary measurement taken for an immediate action and permanent measures taken during the next refueling outage.
