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.

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

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

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

https://doi.org/10.3327/jnst.36.683

no abstracts in English

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

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

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

Nishino, Kazunari; Nagai, Akinori; Tobita, Shigeharu

no journal, , 

no abstracts in English

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

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