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JAEA Reports

Design and manufacture of Joyo upper core structure for replacement

Ota, Katsu; Ushiki, Hiroshi*; Maeda, Shigetaka; Kawahara, Hirotaka; Takamatsu, Misao; Kobayashi, Tetsuhiko; Kikuchi, Yuki; Tobita, Shigeharu; Nagai, Akinori

JAEA-Technology 2015-026, 180 Pages, 2015/11

JAEA-Technology-2015-026.pdf:79.87MB

In the experimental fast reactor Joyo, it was confirmed that the top of the irradiation test sub-assembly of "MARICO-2" (material testing rig with temperature control) had bent onto the in-vessel storage rack as an obstacle and had damaged the upper core structure (UCS). The replacement of the UCS was conducted from May to December 2014. The design and manufacture of UCS was started from 2008, and the installation of UCS was completed successfully in November 21th 2014. The major results gained during the design and manufacture of UCS is as follows.

JAEA Reports

Inspection and repair techniques in the reactor vessel of the experimental fast reactor Joyo; Observation technical development in a reactor vessel of the fast reactor

Imaizumi, Kazuyuki; Saito, Takakazu; Tobita, Shigeharu; Nagai, Akinori; Kitamura, Ryoichi; Okazaki, Yoshihiro

JAEA-Technology 2012-027, 49 Pages, 2012/08

JAEA-Technology-2012-027.pdf:7.07MB

In-Vessel Observations (IVO) techniques for Sodium cooled Fast Reactors (SFRs) are important in confirming its safety and integrity. In order to secure the reliability of IVO techniques, it was necessary to demonstrate the performance under the actual reactor environment with high temperature, high radiation dose and remained sodium. During the investigation of an incident occurred in Joyo, the following observation systems were specifically developed for Joyo. And the following two observations were conducted. (1) Simple overhead observation using a standard video camera for the top of the sub-assemblies and the in-vessel storage rack (2) Narrow space observation using remote handling device equipped with radiation-resistant fiberscope for the bottom face of the upper core structure. As a result, the observations under the actual reactor environment were successfully made even in the narrow space in the reactor vessel and the results provided useful information on incident investigations and planning of restoration work.

Journal Articles

Countermeasures for the corrosion in the water cooling system in Joyo

Shimizu, Shunji; Tobita, Shigeharu; Tobita, Takeshi; Aoki, Shintaro*

UTNL-R-0477, p.11_1 - 11_8, 2011/08

no abstracts in English

Journal Articles

Maintenance experience of experimental fast reactor Joyo, 3; The Countermeasure for wear of the crankshaft bearing of the diesel generator

Funaki, Isao; Tobita, Shigeharu; Nagai, Akinori; Nishino, Kazunari

Nihon Hozen Gakkai Dai-7-Kai Gakujutsu Koenkai Yoshishu, p.263 - 266, 2010/07

no abstracts in English

Journal Articles

Plant life management in JOYO; Replacement of gas coolers in reactor vessel concrete shield cooling system and cold trap system

Tobita, Shigeharu; Nishino, Kazunari; Sumino, Kozo; Ogawa, Toru

UTNL-R-0453, p.2_1 - 2_10, 2006/03

no abstracts in English

JAEA Reports

Acceleration irradiation test of first-loading fuel of High Temperature Engineering Test Reactor (HTTR) up to high burnup (Joint research)

Sawa, Kazuhiro; Sumita, Junya; Ueta, Shohei; Takahashi, Masashi; Tobita, Tsutomu*; Hayashi, Kimio; Saito, Takashi; Suzuki, Shuichi*; Yoshimuta, Shigeharu*; Kato, Shigeru*

JAERI-Research 2002-012, 39 Pages, 2002/06

JAERI-Research-2002-012.pdf:3.12MB

no abstracts in English

JAEA Reports

A Conceptual study of oxidization resistant fuel compact for High Temperature Gas-cooled Reactors

Sawa, Kazuhiro; Tobita, Tsutomu*; Suzuki, Shuichi*; Yoshimuta, Shigeharu*; Oda, Takefumi*; Watarumi, Kazutoshi*

JAERI-Tech 99-077, p.41 - 0, 1999/11

JAERI-Tech-99-077.pdf:5.23MB

no abstracts in English

Journal Articles

Fabrication of the first-loading-fuel of the High Temperature engineering Test Reactor

Sawa, Kazuhiro; Tobita, Tsutomu*; Mogi, Haruyoshi; Shiozawa, Shusaku; Yoshimuta, Shigeharu*; Suzuki, Shuichi*; *

Journal of Nuclear Science and Technology, 36(8), p.683 - 690, 1999/08

 Times Cited Count:32 Percentile:89.81(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Development of advanced fabrication technology for high-temperature gas-cooled reactor fuel; Reduction of coating failure fraction

Minato, Kazuo; ; Tobita, Tsutomu*; Fukuda, Kosaku; Yoshimuta, Shigeharu*; *; *; *; *

JAERI-Research 98-070, 25 Pages, 1998/11

JAERI-Research-98-070.pdf:2.18MB

no abstracts in English

JAEA Reports

Evaluation method and prediction result of fuel behavior during the high temperature engineering test reactor operation

Sawa, Kazuhiro; Yoshimuta, Shigeharu*; ; Saito, Kenji; Tobita, Tsutomu*

JAERI-Research 98-016, 34 Pages, 1998/03

JAERI-Research-98-016.pdf:1.21MB

no abstracts in English

JAEA Reports

Development of evaluation method of fuel failure fraction during the high temperature engineering test reactor operation

Sawa, Kazuhiro; Yoshimuta, Shigeharu*; Tobita, Tsutomu*;

JAERI-Research 97-036, 23 Pages, 1997/05

JAERI-Research-97-036.pdf:0.72MB

no abstracts in English

Oral presentation

Upgrade of irradiation techniques in the experimental fast reactor "JOYO", 1; Traversable sample irradiation rig

Takamatsu, Misao; Tobita, Shigeharu; Sekine, Takashi; Kitamura, Ryoichi; Aoyama, Takafumi

no journal, , 

no abstracts in English

Oral presentation

Inspection and repair techniques in reactor vessel of sodium cooled fast reactor, 5; Visual inspection and obstacle removal method in reactor vessel of the experimental fast reactor Joyo

Ito, Hideaki; Nagai, Akinori; Tobita, Shigeharu; Ashida, Takashi; Kaito, Yasuaki; Katagiri, Genichi*; Kodama, Takemitsu*; Yoshimura, Tetsuji*

no journal, , 

no abstracts in English

Oral presentation

Inspection and repair techniques in reactor vessel of sodium cooled fast reactor, 2-3; Visual inspection results in Joyo reactor vessel

Imaizumi, Kazuyuki; Saito, Takakazu; Tobita, Shigeharu; Suzuki, Toshiaki

no journal, , 

no abstracts in English

Oral presentation

Inspection and repair techniques in reactor vessel of sodium cooled fast reactor, 2-2; Development of visual inspection device to observe in-vessel structures

Imaizumi, Kazuyuki; Tobita, Shigeharu; Saito, Takakazu; Katagiri, Genichi*; Aizawa, Hideyuki*; Yaginuma, Yoshihiro*

no journal, , 

no abstracts in English

Oral presentation

Maintenance experience and high aging countermeasure of the emergency diesel power generators

Nishino, Kazunari; Nagai, Akinori; Tobita, Shigeharu

no journal, , 

no abstracts in English

Oral presentation

Inspection techniques in reactor vessel of sodium cooled fast reactor

Imaizumi, Kazuyuki; Saito, Takakazu; Tobita, Shigeharu; Nagai, Akinori

no journal, , 

no abstracts in English

Oral presentation

Inspection and repair techniques in reactor vessel of sodium cooled fast reactor, 9-3; Replacement of UCS

Ota, Katsu; Ito, Hiromichi; Ushiki, Hiroshi; Yoshihara, Shizuya; Tobita, Shigeharu; Kawahara, Hirotaka; Hara, Masahide*; Okazaki, Hiroyoshi*; Tanaka, Junya*; Tatsuno, Takahiro*

no journal, , 

no abstracts in English

Oral presentation

Regular evaluation of "Joyo" (2nd) about long-term maintenance plan and its implementation situation (I)

Kikuchi, Yuki; Tobita, Shigeharu; Suzuki, Toshiaki; Kawahara, Hirotaka

no journal, , 

no abstracts in English

19 (Records 1-19 displayed on this page)
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