Development of inspection and repair techniques in reactor vessel of experimental fast reactor "Joyo"; Retrieval of the bent test subassembly

Ashida, Takashi; Ito, Hideaki; Miyamoto, Kazuyuki*; Nakamura, Toshiyuki; Koga, Kazuhiro*; Ohara, Norikazu*; Ino, Hiroichi*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 15(4), p.210 - 222, 2016/12

https://doi.org/10.3327/taesj.J15.032

In the experimental fast reactor Joyo, it was confirmed that the top of the irradiation test sub-assembly of material testing rig named "MARICO-2" had been broken and bent onto the in-vessel storage rack as an obstacle and had damaged the upper core structure (UCS). As the result, for Joyo restart, it was necessary to replace the damaged UCS and to retrieve the bent sub-assembly. This paper describes in-vessel repair techniques performed in the retrieval work of the obstacle inside of the reactor vessel. The devices which were prepared for this work demonstrated expected performance under the environmental conditions of an SFR such as high temperature and radiation dose, and the work was completed in 2014. The successful operation of this retrieval work of the damaged component inside of a reactor vessel will contribute to the development of in-service inspections and repair technics in an SFR.

Development of 15-m-long radiation hard periscope for ITER in-vessel viewing

Obara, Kenjiro; *; Kakudate, Satoshi; Oka, Kiyoshi; Nakahira, Masataka; Morita, Yosuke; *; *; Takeda, Nobukazu; Takahashi, Hiroyuki*; et al.

Fusion Engineering and Design, 42, p.501 - 509, 1998/00

https://doi.org/10.1016/S0920-3796(98)00096-9

no abstracts in English

Conceptual design studies of in-vessel viewing equipment for ITER

Obara, Kenjiro; Oka, Kiyoshi; *; *; Tada, Eisuke; Shibanuma, Kiyoshi

JAERI-Tech 96-010, 29 Pages, 1996/03

JAERI-Tech-96-010.pdf:1.15MB

no abstracts in English

Application of laser induced breakdown spectroscopy and its related technology for nuclear engineering

Wakaida, Ikuo

no journal, , 

no abstracts in English