検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

The Formulation of material characteristics of austenitic stainless steels at extremely high temperature

超高温におけるオーステナイト系ステンレス鋼の材料特性式の定式化

下村 健太 ; 鬼澤 高志 ; 加藤 章一 ; 安藤 勝訓 ; 若井 隆純 

Shimomura, Kenta; Onizawa, Takashi; Kato, Shoichi; Ando, Masanori; Wakai, Takashi

本発表では、原子力プラントのシビアアクシデント時に対応した超高温におけるオーステナイト系ステンレス鋼の材料特性式の定式化について述べる。福島第一原子力発電所のシビアアクシデントの後、異常発生の防止(第1層から第3層)だけでなく、異常状態の緩和(第4層)も重要視されるようになった。シビアアクシデント状態での構造健全性評価を行うために、有限要素解析のような数値解析に使用可能な材料特性が要求されている。しかしながら、超高温において構造健全性評価に適用できる材料特性は無かった。したがって、原子力プラントのシビアアクシデント時すなわち1000$$^{circ}$$Cまでの超高温においてオーステナイト系ステンレス鋼に対して引張及びクリープ試験を実施した。この試験で得られた結果を基に、最大1000$$^{circ}$$Cまでの超高温において構造解析に適用可能な単調応力-ひずみ関係とクリープ破断関係を定式化した。その結果、これらの式により有限要素解析のような数値解析を使用した構造健全性評価を可能とした。

This paper describes the formulation of material characteristics of austenitic stainless steels at extremely high temperature which meets in some kinds of severe accidents of nuclear power plants. After the severe accident in Fukushima Dai-ichi Nuclear Power Plants, it has been supposed to be very important not only to prevent the occurrence of abnormal conditions, i.e. from the first to the third layer safety, but also to prevent the expansion of the accident conditions, i.e. the fourth layer safety. In order to evaluate the structural integrity under the severe accident condition, material characteristics which can be used in the numerical analyses, such as finite element analysis, were required. However, there were no material characteristics applicable to the structural integrity assessment at extremely high temperature. Therefore, a series of tensile and creep tests was performed for austenitic stainless at extremely high temperature which meets in some kinds of severe accidents of nuclear power plants, namely up to 1000$$^{circ}$$C. Based on the acquired data from the tests, monotonic stress-strain equation and creep rupture equation applicable to the structural analysis at extremely high temperature, up to 1000$$^{circ}$$C were formulated. As a result, these formulae make it possible to conduct the structural integrity assessment using numerical analysis techniques, such as finite element method.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.