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Journal Articles

Fabrication and application of microcapsules including fluorescent magnetic particles for crack inspection of pipes

Ito, Fuyumi; Nishimura, Akihiko

Transactions of the Materials Research Society of Japan, 38(4), p.667 - 672, 2013/12

We are proposing Magnetic particle Testing (MT) using fabricated micro capsules by the hand-shake method. Here a test piece magnetized beforehand is immersed in liquid dispersed with magnetic particles. Fluorescent pigment adheres to the magnetic particles. So, MT is able to facilitate the crack visually as long as a certain amount of magnetic particles are holding the fluorescent pigment. However, separation between particle and pigment degrades transparency in liquid. Finally the hazy liquid makes difficult to find any crack. To solve this problem, we propose to use the Magnetic Particle Micro Capsule (MPMC). In addition, to applying this MPMC, the surround of the nuclear power plant should be confirmed. To confirm inside wall, the Laser Induced Breakdown Spectroscopy (LIBS) was applied.

Journal Articles

Fabrication of micro capsule containing fluorescent magnetic particles for advanced inspection of heat exchanger tubes

Ito, Fuyumi; Nishimura, Akihiko

E-Journal of Advanced Maintenance (Internet), 4(2), p.57 - 63, 2012/08

Stress corrosion cracking sometimes occurs in the heat exchanger tubes of aging nuclear power plants. At the present time, Eddy Current Testing (ECT) is used to inspect these heat exchanger tubes. When symptoms of corrosion or cracks are found on the inside wall of the tubes, they are usually repaired. As repaired tubes increase in number, the cost of repair work rises considerably. Therefore, discovering tiny cracks has the purpose of ensuring not only progress on safety but also economical benefit. Cracks are observed not only by ECT but also by Magnetic particle Testing (MT), which facilitates visual observation. In the case of MT, a dispersed liquid with magnetic particles is applied to a magnetized sample. However, this dispersed liquid could potentially enter inside the crack. To solve this problem, this paper proposes that magnetic particles be contained inside a micro capsule, this capsule calls Magnetic Particle Micro Capsule (MPMC).

Journal Articles

A Fluorescent micro capsule manufacture of magnetic particle testing for advanced inspection technique of heat exchanger tubes

Ito, Fuyumi; Nishimura, Akihiko

Nihon Hozen Gakkai Dai-6-Kai Gakujutsu Koenkai Yoshishu, p.551 - 553, 2009/08

Fine magnetic particles having UV fluorescence are commonly used in magnetic crack detection technique. Stress corrosion cracking sometimes happens in nuclear power plants. To apply this technique to maintain the heat exchanger tubes, it is desired that these particles has performance to be collected with ease. To collect these fine magnetic particles from millimeter size crack depth, a chemosynthesis technique to produce the micro capsules successfully produced hundreds micron sized capsules containing the fine magnetic particles. The synthesized micro capsules indicated the collective sensitivity for lines of magnetic force.

Oral presentation

Proposal of the scale removal in heat exchanger tubes inner wall using laser peening

Ito, Fuyumi; Nishimura, Akihiko; Shimada, Yukihiro; Ishikawa, Noriko

no journal, , 

no abstracts in English

Oral presentation

Development of the laser processing head for 1 inch inner diameter heat exchanger tube

Nishimura, Akihiko; Akatsu, Tomohiro*; Seki, Takeshi*; Oka, Kiyoshi; Ito, Fuyumi; Shimada, Yukihiro

no journal, , 

no abstracts in English

Oral presentation

A Fabrication of microcapsule containing the fluorescent magnetic particle employed as material of advanced inspection technique in heat exchanger tube

Ito, Fuyumi; Nishimura, Akihiko

no journal, , 

Fine magnetic particles having UV fluorescence are commonly used in magnetic crack detection technique. Stress corrosion cracking sometimes happens in nuclear power plants. To apply this technique to maintain the heat exchanger tubes, it is desired that these particles has performance to be collected with ease. To collect these fine magnetic particles from millimeter size crack depth, a chemosynthesis technique to produce the micro capsules successfully produced hundreds micron sized capsules containing the fine magnetic particles. The synthesized micro capsules indicated the collective sensitivity for lines of magnetic force.

Oral presentation

Application of the microcapsule fabrication technology to magnetic particle testing

Ito, Fuyumi; Nishimura, Akihiko; Norimatsu, Takayoshi*; Nagai, Keiji*

no journal, , 

The purpose of the research is to apply the micro capsule technology to the facility maintenance. The micro capsule technology for laser fusion target was developed at the institute of laser engineering Osaka University. We have a plan to apply the fabrication technology of polystyrene micro capsules to the facility maintenance where the magnetic particle testing for complex piping system is investigated.

Oral presentation

Development of maintenance probing system for heat exchanger tubes; Integrated system demonstration

Nishimura, Akihiko; Yamaguchi, Toshihiko; Oka, Kiyoshi; Akatsu, Tomohiro*; Ito, Fuyumi; Yamashita, Takuya

no journal, , 

no abstracts in English

Oral presentation

Laser welding repair by a new probing system for FBR heat exchanger tubes

Nishimura, Akihiko; Yamaguchi, Toshihiko; Akatsu, Tomohiro*; Ito, Fuyumi; Oka, Kiyoshi

no journal, , 

no abstracts in English

Oral presentation

Improvement of maintenance probing system for the inside wall of heat exchanger tubes

Nishimura, Akihiko; Akatsu, Tomohiro*; Takenaka, Yusuke*; Yamaguchi, Toshihiko; Ito, Fuyumi; Oka, Kiyoshi; Yamashita, Takuya

no journal, , 

no abstracts in English

Oral presentation

Development of new probing system with LIBS and fiber scope inspection for damaged nuclear reactor core

Nishimura, Akihiko; Ito, Fuyumi; Terada, Takaya; Shimada, Yukihiro

no journal, , 

no abstracts in English

Oral presentation

Development of inspection repair technology for tube inner wall of aging nuclear power plants

Ito, Fuyumi; Nishimura, Akihiko; Yonemoto, Yukihiro*; Terada, Takaya; Shimada, Yukihiro

no journal, , 

Development of inspection repair technology for tube inner wall of aging nuclear power plants was described. Three functions of the pulse laser, observation by the composite-type optical fiber scope, and laser-induced breakdown spectroscopy (LIBS) are built into a coupling device. In addition, to facilitate the observation of the cracks, we adopted the magnetic particle testing (MT). And to remove the dispersed magnetic particle liquid from cracks after MT, we manufactured a microcapsule containing the magnetic particle liquid. Furthermore, pulse laser ablation with LIBS can clean up the oxide layer of the inner wall of heat exchanger tubes. Applying LIBS on tube inner wall before MT can give us the information about cracks and defects.

Oral presentation

Combination of LIBS and fiber endoscopic observation in limited tubular space

Nishimura, Akihiko; Ito, Fuyumi; Terada, Takaya; Tomiyoshi, Kentaro; Oka, Kiyoshi

no journal, , 

no abstracts in English

Oral presentation

Coupling device for the limited tubular space in the maintenance of nuclear power plants

Tomiyoshi, Kentaro; Ito, Fuyumi; Nishimura, Akihiko

no journal, , 

Careful inspection should be paid on aging nuclear power plants. Due to the Fukushima BWR accident, more advanced inspection techniques are now requested in Japan. To find SCC along welded sections by Ultrasonic Testing or Eddy Current Testing is difficult due to the low S/N. Here we propose to apply Magnetic particle Testing (MT) on the inspection. MT uses magnetic particles uniting fluorescent pigment. It is a weak point of MT that uniting particles and pigment is breakable. To extend the lifetime. We developed unique capsule for the magnetic particle to coexist with fluorescent pigment. In addition, MT using the micro capsules and related devices are presented.

Oral presentation

Laser processing technologies in limited tubular space by a composite-type optical fiber system

Terada, Takaya; Ito, Fuyumi; Nishimura, Akihiko

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

Development of inspection technique using laser induced breakdown spectroscopy

Ito, Fuyumi; Nishimura, Akihiko; Terada, Takaya; Shimada, Yukihiro

no journal, , 

An optical fiber coupling device for maintenance is developed. A function such as observation of target object by wide-angle image, and the technique such as the elemental analysis by spectroscope and laser are built in the very compact device. Therefore, this device would permit wide-angle image and laser processing at oppressive conditions. The target object was measured and observed by these functions. Finally, industry application of this device was discussed.

Oral presentation

Development of an inspection probing system for the case of reactor melt down accident

Ito, Fuyumi; Nishimura, Akihiko; Tomiyoshi, Kentaro; Ito, Chikara; Sugiyama, Akira

no journal, , 

An innovative probing system should be required for the case of reactor core melt down accidents. In the Fukushima Daiichi BWRs, molten debris might drop in the pedestal under the reactor pressure vessel. Due to the high radioactive situation, the probing system is going to be inserted into the pedestal by a remote controlled robotic arm. We are planning the probing system which consists of optics of Laser Induced Breakdown Spectroscopy (LIBS), a waterproof view scope, radiation resistant optical fibers, radiation dose monitor, and so on. The purpose of LIBS is to analyze the composition of the molten debris. That of the waterproof view scope is to know its position in the pedestal. The following paragraph mentions each outline which we did until now.

Oral presentation

Upgrade of the laser probe system for plumbing maintenance

Tomiyoshi, Kentaro; Ito, Fuyumi; Terada, Takaya; Oka, Kiyoshi; Nishimura, Akihiko

no journal, , 

no abstracts in English

Oral presentation

Development of an inspection probing system using laser monitoring for aging power plants

Ito, Fuyumi; Nishimura, Akihiko; Tomiyoshi, Kentaro

no journal, , 

An optical fiber coupling device for maintenance was developed. A function such as observation of target object by wide-angle image, and the technique such as the elemental analysis by spectroscope and laser were built in the very compact device. Therefore, this device would permit wide-angle image and laser processing at oppressive conditions. The target object was measured and observed by these functions. Finally, industry application of this device was discussed.

26 (Records 1-20 displayed on this page)