Damage Evaluation Techniques for FBR and LVVR Structural Materials Based on Magnetic and Corrosion Properties along Grain Boundaries

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星屋 泰二; 高屋 茂  ; 永江 勇二 ; 阿部 康弘; 青砥 紀身 ; 上野 文義*  

Hoshiya, Taiji; Takaya, Shigeru; Nagae, Yuji; Abe, Yasuhiro; Aoto, Kazumi; Ueno, Fumiyoshi*

原研とサイクル機構は、LWR及びFBR照射環境における材料劣化現象について、粒界近傍の特性変化に着目して、電磁気学的材料劣化評価法及び極微小腐食量計測法を用いた劣化機構及び劣化検出の検討を共同して開始した。本報では、イオン照射材に関する磁気測定実験法の概要、原子間力顕微鏡による評価法を中心に報告する。

Japan Atomic Energy Research Institute and Japan Nuclear Cycle Development Institute have begun The cooperative research of novel evaluation techniques of structural material degradation in Fast Breeder Reactor (FBR) and Light Water Reactor (LWR), which based on magnetic and corrosion properties along grain boundaries Magnetic method has been proposed as the one of the innovative non-destructive detection techniques on the early stage of creep-damage before crack initiation for aged structural materials of FBRs. On the other hand, corrosion properties and magneto-optical characteristics of ion-irradiated stainless steel in the vicinity of grain boundaries were estimated by AFM. These degradations were induced by changes in characteristics in the vicinity of grain boundaries, such as chromium depletion. It is found that the initial level of progressing process of damage can detect changes in magnetic and corrosion properties along grain boundaries of aged and degraded nuclear