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JAEA Reports

Experimental study on dilution coefficients measurement of capsule dilution tube for fuel transient tests

Inoue, Shuichi; Omuro, Tadao; Nabeya, Hideaki; Matsui, Yoshinori; Iida, Kazuhiro; Ito, Kazuyuki; Kimura, Akihiro; Kanno, Masaru

JAEA-Technology 2010-010, 27 Pages, 2012/05

JAEA-Technology-2010-010.pdf:1.99MB

In fuel irradiation transient tests using a boiling water capsule, a dilution tube has been installed in the boiling water capsule in order to detect fission products (FP) from an irradiated fuel, in case of the fuel failure during the transient, by a radiation monitor located outside the reactor. When the fuel failure occurs, the released FP flows out from the capsule through the dilution tube. The dilution tube is designed to minimize the released FP that can be detected by the radiation monitor located outside the reactor. This report summarized the measurement results of the dilution tube installed in the boiling water capsule.

Journal Articles

Radio frequency plasma transition caused by gas puffing and/or direct current biasing using multiturn internal antenna

Yamauchi, Toshihiko; Kobayashi, Seiji*; Sugibayashi, Hideyuki*; Tachibana, Toshiyuki*; Naito, Shunya*; Kanno, Yoshinori*; Hiruta, Toshihito

Japanese Journal of Applied Physics, 51(1), p.01AA02_1 - 01AA02_7, 2012/01

 Times Cited Count:0 Percentile:0(Physics, Applied)

In the beginning of this study, the RF (radio frequency) plasma by the internal antenna which is in contrast to that of the external antenna, was considered for the transition from the charged coupled plasma (CCP) to the inductively coupled plasma (ICP) not to be observed. On the contrary, in our plasma experiment by using the internal multi-turn RF antenna, the transition phenomenon was observed at the extent of 40 W in RF power. In this experiment, the relation between the gas pressure and the RF power on the transition from CCP to ICP indicated almost the same characteristic as Paschen's law. But the transition physics, or the absorption mechanism of RF power based on the collision dumping, was strongly complex. We have experimentally represented the CCP-ICP transition to study the physics using the original physical technique. Firstly, we changed the CCP into the ICP by the gas control. It was considered that the increase of the electron temperature caused the transition. Secondly, the decrease of gas pressure displayed the same meaning with the longer period of the self-pulse transition. Thirdly, the self-bias caused by RF power and the external bias applied between the RF antenna and the stage were described for the transition physics.

Journal Articles

Behavior of transition into inductively coupled plasma mode with internal radio frequency multiturn antenna

Nakagaki, Keita; Yamauchi, Toshihiko; Kanno, Yoshinori*; Kobayashi, Seiji*; Takemoto, Ryo*

Japanese Journal of Applied Physics, 47(3), p.1745 - 1747, 2008/03

 Times Cited Count:2 Percentile:9.83(Physics, Applied)

The CVD system with internal RF multi-turn antenna coil for 27.12 MHz was developed, and to study the transition between CCP (Capacitively Coupled Plasma) and ICP (Inductively Coupled Plasma). The observed transition was classified into three types of transition: the standard transition, the direct transition without the CCP-mode and the repeated transition. The power boundary condition for each transition which is associated with the gas pressure and RF power is presented. Here, the standard transition was mainly presented: The transition time was 8 $$mu$$s at 10 Pa, which became longer with the increase of gas pressure. The increments of electron temperature and density by the transition into ICP were three times and double figures higher respectively.

Journal Articles

Advanced ceramics synthesized by inductively coupled plasma with inner RF antenna

Nakagaki, Keita; Yamauchi, Toshihiko; Kanno, Yoshinori*; Kobayashi, Seiji*

Japanese Journal of Applied Physics, 47(1), p.797 - 799, 2008/01

 Times Cited Count:1 Percentile:5.17(Physics, Applied)

The CVD system by 27.12 MHz RF heating plasma discharge was developed to investigate the synthesis of the advanced ceramics, particularly diamond. Our system was unique, whose four turns RF antenna coil was installed inside of chamber. Here, we found the interesting physical behavior for the first time which the charge coupled plasma (CCP) changed to the inductively coupled plasma (ICP) suddenly at the threshold power. The plasma characteristics which were measured by the double probe were Te$$sim$$10 eV and ne 10E11 cm$$^{-3}$$ suitable for the dissociation. No impurity was observed in plasma, judging from the spectroscopic measurement. The ball-like diamond was synthesized on the silicon (Si) substrate by the low power RF heating plasma.

Journal Articles

Dissociation characteristics of light absorbed dioxin analogues calculated by density functional theory

Yamauchi, Toshihiko; Kobayashi, Seiji*; Ito, Shinichi*; Yamazaki, Kazuhiko; Kamei, Yasutaka*; Kanno, Yoshinori*

Kankyo Kagakkai-Shi, 19(6), p.507 - 515, 2006/11

Using DFT two benzene rings in Co-PCB are found to be twisted on the bond axis, whose angle is 37.8$$^{circ}$$ in Co-PCB(3,3$$^{'}$$,4,4$$^{'}$$,5), and it is 90$$^{circ}$$ in PCB(1,1$$^{'}$$,2,2$$^{'}$$,3,3$$^{'}$$,4,4$$^{'}$$,5,5$$^{'}$$), and two benzene rings of TCDD or TCDF are in the same plane. Next, the dissociation of chlorine atom from dioxin is realized using the violet light below 318 nm as the bond dissociation energy 3.8$$sim$$3.9 eV estimated by the energy difference between the dioxin and the chlorine atom plus dioxin radical. The orbital bond energy is estimated to be 4.1$$sim$$5.5 eV, and the zero-point energy is also estimated to be 0.38$$sim$$1.65 eV. The bond dissociation energy is inverse proportion to the number of chlorine atoms in dioxins. On the other hand, the dissociation reaction by the extract of chlorine using hydrogen atom is successfully analysed. The reaction times of dechlorination, or the extract reaction of chlorine and the photolytic process, are 22$$sim$$40 fs.

JAEA Reports

Design of water feeding system for IASCC irradiation tests at JMTR

Kanno, Masaru; Nabeya, Hideaki; Mori, Yuichiro*; Matsui, Yoshinori; Tobita, Masahiro*; Ide, Hiroshi; Itabashi, Yukio; Komori, Yoshihiro; Tsukada, Takashi; Tsuji, Hirokazu

JAERI-Tech 2001-080, 57 Pages, 2001/12

JAERI-Tech-2001-080.pdf:2.34MB

no abstracts in English

Oral presentation

Advanced ceramics synthesis produced by laser/CVD plasma, Plasma Behavior

Yamauchi, Toshihiko; Nakagaki, Keita*; Kanno, Yoshinori*; Kobayashi, Seiji*; Saigusa, Mikio*; Takemoto, Ryo*; Yamashita, Naohito*; Kawashima, Tomohiro*

no journal, , 

no abstracts in English

Oral presentation

Sharp transition of plasma mode from CCP to ICP with inside RF antenna for CVD

Yamauchi, Toshihiko; Nakagaki, Keita; Kanno, Yoshinori*; Kobayashi, Seiji*; Takemoto, Ryo*

no journal, , 

no abstracts in English

Oral presentation

Sudden transition into ICP-mode from CCP-mode with internal RF multi-turn antenna of CVD

Yamauchi, Toshihiko; Nakagaki, Keita; Kanno, Yoshinori*; Kobayashi, Seiji*; Takemoto, Ryo*

no journal, , 

The CVD system with internal RF multi-turn antenna coil for 27.12 MHz was developed, and to study the transition between CCP (Capacitively Coupled Plasma) and ICP (Inductively Coupled Plasma). The observed transition was classified into three types of transition: the standard transition, the direct transition with the mixed-mode and the repeated transition. The power boundary condition for each transition which is associated with the gas pressure and RF power is presented. Here, the standard transition was mainly presented: The transition time was 8 microsec at 10 Pa, which became longer with the increase of gas pressure. The increments of electron temperature and density by the transition into ICP were three times and double figures higher respectively.

Oral presentation

Internal and external pulse operation of CVD plasma produced by a radio frequency

Yamauchi, Toshihiko; Nakagaki, Keita; Kanno, Yoshinori*; Kobayashi, Seiji*; Takemoto, Ryo*

no journal, , 

no abstracts in English

Oral presentation

Growth process of radio-frequency ICP plasma and sputtering behavior from antenna

Yamauchi, Toshihiko; Takemoto, Ryo*; Kanno, Yoshinori*; Kobayashi, Seiji*; Nakagaki, Keita*; Kato, Hatsuhiro*

no journal, , 

no abstracts in English

Oral presentation

Te and ne characteristics of RF plasma with 3-turn internal antenna

Yamauchi, Toshihiko; Takemoto, Ryo*; Yabuno, Masahiro*; Kanno, Yoshinori*; Kobayashi, Seiji*; Shiramizu, Miho*; Takei, Toru*; Kato, Hatsuhiro*; Nakagaki, Keita*

no journal, , 

no abstracts in English

Oral presentation

Transition into ICP connected with internal RF antenna

Yamauchi, Toshihiko; Kanno, Yoshinori*; Kobayashi, Seiji*; Sugibayashi, Hideyuki*

no journal, , 

no abstracts in English

Oral presentation

Refurbishment and restart of JMTR, 5; Development of new irradiation facilities, 2; Materials irradiation test facility

Okada, Yuji; Hanawa, Hiroshi; Matsui, Yoshinori; Kanno, Masaru

no journal, , 

There is "LWR fuels and materials irradiation program" being conducted with the Nuclear and Industrial Safety Agency (NISA) of the Ministry of Economy, Trade and Industry (METI) of Japan in the plan advanced as a new approach for the re-operation in FY2011 in JMTR. The materials irradiation program will be carried out the study for the stress corrosion cracking (SCC) of the reactor structure material and irradiation brittleness of the reactor power vessel steel. It reports on the production and the design of the equipment for these irradiation examinations.

Oral presentation

Refurbishment and restart of JMTR, 4; Plan of new irradiation test facility, 1; Fuel transient test facility system

Nagata, Hiroshi; Yamaura, Takayuki; Hosokawa, Jinsaku; Matsui, Yoshinori; Kanno, Masaru

no journal, , 

no abstracts in English

Oral presentation

Plasma transition caused by change of gas using multiturn internal RF antenna

Yamauchi, Toshihiko; Hamajima, Takafumi*; Kobayashi, Seiji*; Kanno, Yoshinori*; Hiruta, Toshihito

no journal, , 

16 (Records 1-16 displayed on this page)
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