Research on removal technologies of fuel debris and in-vessel structures using laser light (II); Research activities on FY2013

Muramatsu, Toshiharu; Yamada, Tomonori; Hanari, Toshihide; Takebe, Toshihiko; Nguyen, P. L.; Matsunaga, Yukihiro

JAEA-Research 2014-018, 41 Pages, 2014/09

JAEA-Research-2014-018.pdf:42.21MB

In decommissioning works of the Fukushima Daiichi Nuclear Power Plants, it is required that fuel debris solidifying mixed materials of fuels and in-vessel structures should be removed. The fuel debris is considered to have characteristics, such as indefinite shapes, porous bodies, multi-compositions, higher hardness, etc. from the knowledge in the U.S. and the Three Mile Island nuclear power plant. Laser lights are characterized by higher power density, local processability, remote controllabilitiy, etc. and can be performed thermal cutting and crushing-up for various materials which does not depend on fracture toughness. This report describes a research program and research activities in FY2013 aiming at developing removal system of fuel debris by the use of laser lights.

Study on removal technologies for Fukushima's fuel debris using laser light, 5; Characteristics of geometry recognition performance for laser scanning device in laser cutting processes

Yamada, Tomonori; Takebe, Toshihiko; Matsunaga, Yukihiro; Nguyen, P. L.; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Study on removal technologies for Fukushima's fuel debris using laser light, 3; Evaluation of ceramics crushing characteristics by laser light pulse irradiations

Matsunaga, Yukihiro; Hanari, Toshihide; Yamada, Tomonori; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Study on removal technologies for Fukushima's fuel debris using laser light, 2; Characteristic evaluation of metal cutting by laser continuous irradiation and assist gas flow

Hanari, Toshihide; Matsunaga, Yukihiro; Takebe, Toshihiko; Yamada, Tomonori; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Laser cutting and crushing for indefinite shape materials

Yamada, Tomonori; Hanari, Toshihide; Takebe, Toshihiko; Matsunaga, Yukihiro; Nguyen, P. L.; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Evaluation of fiber laser cutting and crushing applied to the removal technology of fuel debris and in-vessel structures

Yamada, Tomonori; Hanari, Toshihide; Takebe, Toshihiko; Matsunaga, Yukihiro; Nguyen, P. L.; Muramatsu, Toshiharu

no journal, , 

In the decommissioning of the Fukushima Daiichi NPPs, remote handling techniques are necessary to remove the fuel debris which is solidified by mixed molten materials composed of fuels and in-vessel structures. In terms of remote handling, a laser beam can penetrate a narrow gap and it can shoot the substance without reactive force. Thus, a laser has been expected as one of the useful decommissioning tools. In this paper, to evaluate the cutting and crushing performances, we performed thick metal cutting and ceramics crushing using a fiber laser. A continuous wave mode and pulsed mode make it possible to cut a 30 mm thick SS400 steel plate and to crush a 10 mm thick alumina pellet. Moreover, we succeeded to cut a metal-ceramic mixture materials using fiber laser, in combination with x-y-z tri-axes control system and laser scanner. It is hoped that the outcome of the present study would be of some use to develop remote cutting and crushing technique for the decommissioning.

Evaluation of pulsed laser irradiation on concrete using a QCW laser system

Nguyen, P. L.; Daido, Hiroyuki; Matsunaga, Yukihiro; Hanari, Toshihide; Terada, Takaya; Yamada, Tomonori; Kawachi, Tetsuya

no journal, , 

Evaluation of characteristic of pulsed laser irradiation on concrete using a QCW laser system

Nguyen, P. L.; Daido, Hiroyuki; Matsunaga, Yukihiro; Terada, Takaya; Yamada, Tomonori; Kawachi, Tetsuya

no journal, , 

Development of human resources for FUKUSHIMA revitalization at the NARAHA Remote Technology Development Center; Laser technology and robot technology in summer education program

Nishimura, Akihiko; Hanari, Toshihide; Nakamura, Masaki; Matsunaga, Yukihiro; Shimomura, Takuya; Daido, Hiroyuki; Nakai, Koji; Yamada, Taichi; Izaki, Kenji; Kawatsuma, Shinji

no journal, , 

no abstracts in English

レーザー光を用いた溶断・破砕適応制御装置

村松 壽晴; 山田 知典; 羽成 敏秀; 武部 俊彦; 松永 幸大

酒井 英明*; 碓井 秀三*; 中田 正宏*; 坪井 昭彦*; 社本 英泰*

JP, 2014-016086  Patent licensing information  Patent publication (In Japanese)

【課題】異なる材料が混在して、無定形で不規則な外形を有する処理対象物を、その材料に対応して溶断あるいは破砕できるレーザー光を用いた溶断・破砕適応制御装置を提供する。 【解決手段】レーザー加工ヘッド6を搭載したロボット1、対象物19の状態を検出する検出部3、検出情報に基づいてロボット1を制御する制御部2を備え、検出部3は対象物19からのレーザー光8の反射光25を受光し、反射光25に基づいて対象物19の形状を認識するレーザースキャナ12、反射光25に基づいて対象物19の材質を検出する分光計1と、反射光25に基づいて対象物19の溶断の有無を検出する温度計13を有し、制御部2は検出部3からの情報に基づいて、ロボットをするロボット制御部と、レーザー光8を制御するレーザー光制御部9を有している。