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Itakura, Mitsuhiro; Kaburaki, Hideo; Arakawa, Chuichi
Physical Review E, 71(5), p.055102_1 - 055102_4, 2005/05
Times Cited Count：9 Percentile：39.32(Physics, Fluids & Plasmas)The process of slow intergranular crack propagation was investigated by the finite element method model and it was found that branching is induced by partial arresting of a crack front owing to the geometrical randomness of grain boundaries. A possible scenario for the branching instability of crack propagation in a disordered continuous medium is also discussed.
The Working Team for Examination Operation of Samples from Primary Loop Recirculation Piping at Onag
JAERI-Tech 2004-003, 74 Pages, 2004/02
JAERI-Tech-2004-003.pdf:30.08MB
The present examination has been performed with the objective to provide technical basis for identifying causes of cracking through the examination of the samples, which was conducted at the post irradiation examinations facilities of JAERI, taken from the cracked region of the recirculation pipe at the Onagawa Nuclear Power Station Unit-1. The following findings were obtained from this examination result. (1) Cracks were observed near the weld region of inner surface of the pipe and depth of the crack was about 5 to 7mm. (2) Intergranular crackings were observed in the almost whole fracture surface. Partially transgranular cracking was observed at the surface layer with the depth of about 100
m. Microstructure formed by cold work and increase of hardness were observed in these surface layers. Cracks initiated near the region where hardness value was the highest. Based on the examination results described above concerning presence of tensile residual stress by welding and relatively high dissolved oxygen contents in core coolant and so on, it is concluded that these cracks were initiated in the cold work layer of inner surface by stress corrosion cracking (SCC) and propagated along the grain boundaries.
Kikuchi, Kenji; Kato, Takashi; Sugimoto, Makoto; *; Fukaya, Kiyoshi; Kaji, Yoshiyuki
Zairyo, 48(2), p.152 - 158, 1999/02
no abstracts in English
Ishii, Toshimitsu; Ooka, Norikazu; Saito, Junichi; Kobayashi, Shunichi; Takahashi, Kunihiro; Tsukada, Takashi; Iwai, Takashi; Kurosawa, Yoshiaki; Hoshiya, Taiji; Tsuji, Hirokazu
Proceedings of International Symposium on Case Histories on Integrity and Failures in Industry (CHIFI), p.227 - 236, 1999/00
no abstracts in English
Kikuchi, Kenji; Kato, Takashi; Sugimoto, Makoto; *; Fukaya, Kiyoshi; Kaji, Yoshiyuki
Dai-35-Kai Koon Kyodo Shimpojiumu Maezurishu, p.95 - 99, 1997/00
no abstracts in English
Tsukada, Takashi
Materials for Advanced Energy Systems & Fission and Fusion Engineering '94, 0, p.466 - 471, 1994/00
no abstracts in English
-Ray Irradiation Effects on Corrosion Resistance of Alloys for Storage of High-Level Waste Packages(I)*; ; ; Araki, Kunio; *; *; *
JAERI-M 82-061, 28 Pages, 1982/07
no abstracts in English
