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Journal Articles

Accuracy of measuring rebar strain in concrete using a diffractometer for residual stress analysis

Yasue, Ayumu*; Kawakami, Mayu*; Kobayashi, Kensuke*; Kim, J.*; Miyazu, Yuji*; Nishio, Yuhei*; Mukai, Tomohisa*; Morooka, Satoshi; Kanematsu, Manabu*

Quantum Beam Science (Internet), 7(2), p.15_1 - 15_14, 2023/05

Journal Articles

Potential for remote controllable systematization of the method of testing reinforced concrete using guided-wave on rebar

Furusawa, Akinori; Nishimura, Akihiko; Takenaka, Yusuke; Muramatsu, Toshiharu

Proceedings of International Topical Workshop on Fukushima Decommissioning Research (FDR 2019) (Internet), 4 Pages, 2019/05

The aim of this work presented here is to demonstrate the potential of our method for remote controllable systematization, of testing reinforced concrete based on ultrasonic guided-wave on rebar. In order to investigate how the deteriorated phenomena has the effects on the ultrasonic guided-wave propagating on the rebar, following experiments are conducted. Test pieces used for the experiments are made of bare steel rod and cylindrically pored mortar to be representing the actual reinforced concrete. Irradiating the end face of the rod with nanosecond pulsed laser makes the ultrasonic guided-wave induced, at the other end face, the guided wave signal is measured with ultrasonic receiver. One test piece is with no damage and the other is deteriorated test piece. The deterioration is made by electrolytic corroded method. The guided-wave signal from the deteriorated test piece is measured with respect to each energization time, the change in the waveform is investigated. Analyzing the results from the experiments above, it is found that the deterioration of rebar has remarkable effects on the guided-wave signal. The signal from test piece with no damage has strong peak at both specific frequency and lower region, on the other hand, signals from deteriorated test piece has only at the specific frequency depending on the diameter of the steel rod. Finally, discussion concerning with the experimental results and future perspective for remote controllable systematization of our method is carried out.

JAEA Reports

Research and development plan for advanced high temperature gas cooled reactor fuels and graphite components (Contract research)

Sawa, Kazuhiro; Ueta, Shohei; Shibata, Taiju; Sumita, Junya; Ohashi, Jumpei; Tochio, Daisuke

JAERI-Tech 2005-024, 34 Pages, 2005/03

JAERI-Tech-2005-024.pdf:2.15MB

The Very-High-Temperature Reactor (VHTR) is one of the strong candidates for the Generation IV Nuclear Energy System. JAERI has developed Zirconium carbide (ZrC)-coated fuel particle and ZrC coating layer is expected to maintain its intactness under higher temperature and burn-up comparing conventional SiC-coating layer. JAERI carries out (1) ZrC-coating process development by large-scale coater, (2) inspection method development and (3) irradiation test and post irradiation experiment of ZrC coated particles. Also, JAERI carries out reactivity insertion tests to clarify the coating failure mechanism and tries to increase allowable temperature limit in case of reactivity insertion accident. Furthermore, JAERI develops non-destructive evaluation methods for mechanical properties of graphite components by ultrasonic testing and micro-indentation technique. This report describes these research and development plan and results of FY 2004 as a MEXT contact research.

JAEA Reports

Development of pipe welding, cutting & inspection tools for the ITER blanket

Oka, Kiyoshi; ; ; ; Takahashi, Hiroyuki*; Tada, Eisuke

JAERI-Tech 99-048, 222 Pages, 1999/07

JAERI-Tech-99-048.pdf:24.01MB

no abstracts in English

Journal Articles

Application of fuzzy theory to radiation control

Hoken Butsuri, 29, p.460 - 462, 1994/00

no abstracts in English

Journal Articles

Cold neutron radiography

Tsuruno, Akira

NDI-10042, p.18 - 22, 1989/00

no abstracts in English

Journal Articles

Profiles of activity ratios of fission products, cesium-134,cesium-137 and ruthenium-106 in low-enriched PuO$$_{2}$$-UO$$_{2}$$ fuel assemblies

; ; Matsuura, Shojiro

Journal of Nuclear Science and Technology, 14(1), p.43 - 53, 1977/01

 Times Cited Count:4

no abstracts in English

Oral presentation

Non-destructive inspection technique for weld part of mercury target vessel

Wakui, Takashi; Wakai, Eiichi; Naoe, Takashi; Kogawa, Hiroyuki; Haga, Katsuhiro; Takada, Hiroshi

no journal, , 

A mercury target vessel has been used for the spallation neutron source at J-PARC. It has a complicated triple-walled structure, which is assembled with thin plates (minimum thickness of 3 mm) by welding. A structural analysis of the new vessel evaluated that allowable defect size not to influence structural integrity was 0.4 mm at a highest stress region. Radiographic testing using the sample with triple-walled structure could not detect the defect within allowable detection size. On the other hand, a non-contact immersion ultrasonic method, which is insensitive to distorted surface of the vessel after welding, was able to detect the defect of 0.2 mm by using a high frequency sensor. We inspected all welding lines (total length of ca. 17 m) of newly fabricated vessel, detecting only six defects and evaluated that their sizes never influence on the structural strength. The present development of the non-destructive inspection technique has improved the reliability of the vessel.

Oral presentation

Applicability evaluation of non-destructive testing using microwaves for a crack on the inner surface of metal pipes

Sasaki, Kota*; Yusa, Noritaka*; Hashizume, Hidetoshi*; Wakai, Takashi

no journal, , 

This study reports applicability evaluations of microwave inspection technique for cracks on inner wall of metal pipes. The experiment is carried out using the straight brass pipe with a diameter of 11.0 mm and the total length of 18.5 m and artificial slits simulating cracks. Experimental result shows significantly large reflections from the slit compared with no flaw, thereby confirming the detectability of this method for cracks in a metal pipes.

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