magnetic measurements under neutron radiation in Fe metal and low carbon steel

Takahashi, Seiki*; Kikuchi, Hiroaki*; Ara, Katsuyuki*; Ebine, Noriya; Kamada, Yasuhiro*; Kobayashi, Satoru*; Suzuki, Masahide

Journal of Applied Physics, 100(2), p.023902_1 - 023902_6, 2006/07

https://doi.org/10.1063/1.2214214

Magnetic minor hysteresis loops of low carbon steel and Fe metal have been measured during neutron radiation at 563 K in a nuclear reactor. For investigation of nucleation mechanism of copper precipitates and dislocation loops, special attention was paid to minor-loop coefficients, which are deduced from simple relations between minor-loop parameters and are very sensitive to lattice defects. We found that with increasing neutron fluence, the minor-loop coefficients of low carbon steel sharply increase and show a maximum at the fluence of 110 cm, followed by a slow decrease. The appearance of the maximum suggests the presence of two mechanisms of internal stress; while copper precipitates and dislocation loops in the matrix make the internal stress increase, those grown in the vicinity of dislocations compensate the internal stress of dislocations. On the other hand, the minor-loop coefficients show a monotonic increase with neutron fluence in Fe metal.

Evaluation of nuclear reactor pressure vessel integrity by magnetic interrogation and problems of relevant magnetic field analysis

Ara, Katsuyuki*; Ebine, Noriya

Denki Gakkai Magunetikkusu Kenkyukai Shiryo (MAG-01-55), p.1 - 6, 2001/03

no abstracts in English

Evaluation of magnetic and mechanical properties of reactor pressure vessel steels by incremental permeability change curve measurements

Ebine, Noriya; Suzuki, Masahide; Ara, Katsuyuki*

Denki Gakkai Magunetikkusu Kenkyukai Shiryo (MAG-00-195), p.45 - 48, 2000/09

no abstracts in English

Method for measuring the overlay-clad thickness of reactor pressure vessels by magnetic measurements

; Ara, Katsuyuki

Nihon Oyo Jiki Gakkai-Shi, 22(4-2), p.905 - 908, 1998/00

no abstracts in English

Instrumentation and control systems of JRR-3M

; Murayama, Yoji; Takayanagi, Masaji; Ara, Katsuyuki

IAEA-TECDOC-973, 0, p.113 - 120, 1997/10

no abstracts in English

Present status and prospects of NUCEF project; Fuel cycle safety engineering research

Takeshita, Isao; Maeda, Mitsuru; Miyoshi, Yoshinori; Ono, Akio; Okazaki, Shuji; Nakajima, Ken; Fujine, Sachio; Kubota, Masumitsu; Muraoka, Susumu; Ara, Katsuyuki; et al.

Genshiryoku Kogyo, 43(9), p.1 - 37, 1997/09

http://ci.nii.ac.jp/naid/40001071385

no abstracts in English

A Possible device for selective detection of magnetic field sources using superconducting and ferromagnetic cylinders

Sakasai, Kaoru; Ara, Katsuyuki

Review of Scientific Instruments, 68(4), p.1739 - 1742, 1997/04

https://doi.org/10.1063/1.1147984

no abstracts in English

Proposal of nondestructive measuring method to assess material degradation in aged nuclear reactor pressure vessels,2

; Ara, Katsuyuki

MAG-96-265, 0, p.11 - 24, 1996/12

no abstracts in English

Development and characteristic of a new eddy current probe for detection of magnetic flux distorted by a flow

; *; Ara, Katsuyuki

JAERI-Research 96-058, 25 Pages, 1996/10

JAERI-Research-96-058.pdf:0.99MB

no abstracts in English

Reconstruction of plasma current profile of tokamaks using combinatorial optimization techniques

Kishimoto, Maki; Sakasai, Kaoru; Ara, Katsuyuki; Fujita, Takaaki; *

IEEE Transactions on Plasma Science, 24(2), p.528 - 538, 1996/04

https://doi.org/10.1109/27.510019

no abstracts in English