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Journal Articles

Contribution by incorporation of laser technology and robotics technology for Fukushima Daiichi Nuclear Power Plants decommissioning

Kawatsuma, Shinji

Reza Kenkyu, 45(7), p.413 - 417, 2017/07

Inside and surrounding area of reactor buildings of Fukushima Daiichi Nuclear Power Plants became high radiation condition because of radioactive materials release by the accidents caused by earthquake of Pacific coast on eastern and northern Japan. In the stage of emergency response to the accidents, more than 20 robots had been deployed, and some of them had equipped with laser technologies like as laser range finder. In the following decommissioning stage of the plans, operations under higher radiation condition will be required, so that varied laser technologies will be needed to fuse with robot technologies. Laser checker laser analysis would be expected besides laser range finder. However those technologies will be deployed under higher radiation condition, so radiation hardening and control stabilizing should be solved.

Journal Articles

Unitization for portability of emergency response surveillance robot system; Experiences and lessons learned from the deployment of the JAEA-3 emergency response robot at the Fukushima Daiichi Nuclear Power Plants

Kawatsuma, Shinji; Mimura, Ryuji; Asama, Hajime*

ROBOMECH Journal (Internet), 4, p.6_1 - 6_7, 2017/02

It was cleared that portability of emergency response reconnaissance robot had been very important. So, RESQ-A robots, which had been developed by Japan Atomic Energy Research Institute (present Japan Atomic Energy Agency), had been considered from the view point of portability. After Fukushima Daiichi NPPs' accidents occurred, JAEA had modified a RESQ-A robot to JAEA-3 robot in order to meet the anticipated situation of the accidents. However, actual situation was beyond the anticipated situation, and additional modification was required. The actual confused situation was many rubble were scattered and temporary cables and hoses were constructed in the reactor buildings, so that reconnaissance robots should be conveyed by operators through limited route, should be reassembled in short time and should be able to remove cable and tiers for reduce the operators' exposure dose during maintenance. JAEA modified again JAEA-3 robot system, with cooperation of operators from Fukushima Daiichi NPPs. It was lesson learned that emergency response reconnaissance robot needed to be unitized for portability, and "Unitization Policy for emergency response reconnaissance robot" was developed.

Journal Articles

Contributions to the decommissioning of Fukushima Daiichi Nuclear Power Station by JAEA Naraha Remote Technology Development Center

Daido, Hiroyuki; Kawatsuma, Shinji; Kojima, Hisayuki; Ishihara, Masahiro; Nakayama, Shinichi

Proceedings of 54th Annual Meeting of Hot Laboratories and Remote Handling (HOTLAB 2017) (Internet), 8 Pages, 2017/00

Journal Articles

Irradiation test of semiconductors components on the shelf for nuclear robots based on Fukushima Accidents

Kawatsuma, Shinji; Nakai, Koji; Suzuki, Yoshiharu; Kase, Takeshi

QST-M-2; QST Takasaki Annual Report 2015, P. 81, 2016/12

Radiation Tolerance of semiconductor components on the shelf, utilized on the robots for emergency response or decommissioning in nuclear facilities, should be estimated. Just after the Fukushima Daiichi NPPs accidents occurred, a guideline, of irradiation tolerance estimation and management method of semiconductor components on the shelf, was tried to be made based on the old database developed in the course of Bilateral Servo Manipulator under the high radiation and high contamination environments. The estimation was conservative, because the data in the database were old and mainly based on the test results of silicon semiconductors. Ga-As Semiconductors are coming major recently, and expected to be higher radiation tolerance. For those reason, present semiconductor devices have irradiated and the irradiation tolerance have estimated.

Journal Articles

Radiation tolerance and management method of Robots and unmanned heavy construction machines using semiconductors on the shelf

Kawatsuma, Shinji; Asama, Hajime*

Nihon Robotto Gakkai-Shi, 34(8), p.552 - 557, 2016/10

There was not a guideline available for researchers, developers or users for robots or heavy construction machines on the evaluation of radiation tolerance and management method of robots and heavy construction machines using semiconductors, like as CPUs on the shelf, under radiation condition, when Fukushima Daiichi NPPs accidents occurred on March 11th, 2011. The evaluation and the management method became necessary, in order to deploy robots like as QUINCE developing for big city accidents or unmanned heavy construction machines for landside disaster. According to "radiation tolerance data base on parts or materials" developed in 1980's to 1990's by Japan Atomic Energy Agency (JAEA), a guideline, for robots and unmanned heavy construction machines, was tentatively developed.

Journal Articles

Naraha Remote Technology Development Center and robots for nuclear disaster

Kawatsuma, Shinji

Dekomisshoningu Giho, (54), p.24 - 33, 2016/09

It has passed more than five years than Tokyo Electric Power Company's Fukushima Daiichi NPPs accidents occurred by huge tsunamis caused by the earthquake in Pacific Ocean Coast of North East District on March 11, 2011. It is very hard for workers to enter and stay for long time to work for decommissioning, because the radiation dose rate in the reactor buildings is too high to extremely high caused by radioactive materials released. Then the Naraha Remote Development Center has been constructed and taken into full operation in April 2016, which center would accelerate the development of remote technologies conducting decommissioning on the behalf of workers. The center is developing robot simulator system and robot performance testing method which could support developing remote operating equipment and devices. Also the center is preparing and operating remote equipment and devices for nuclear emergency response.

Journal Articles

Basic decontamination methodology of robots and robot control vehicles

Kawatsuma, Shinji; Asama, Hajime*

Proceedings of American Nuclear Society 2014 Annual Meeting; Embedded Topical Meeting on Decommissioning and Remote Systems (D&RS 2014) (DVD-ROM), p.19 - 21, 2014/06

Contamination survey and decontamination methodology became to be needed, because several robots could not have been decontaminated enough for direct maintenance even after water spray decontamination when robots and robot control vehicles were contaminated during deployment for emergency response to Fukushima Daiichi NPPs accidents. "Basic Decontamination Methodology" was established based on confirmation of water spray effectiveness, specification of parts difficult to decontaminate by water spray and identifying of effective decontamination method for the parts, after investigations of the robots and robot control vehicles deployed for emergency response to Fukushima Daiichi NPPs accidents.

Journal Articles

Results of detailed analyses performed on boring cores extracted from the concrete floors of the Fukushima Daiichi Nuclear Power Plant reactor buildings

Maeda, Koji; Sasaki, Shinji; Kumai, Misaki; Sato, Isamu; Osaka, Masahiko; Fukushima, Mineo; Kawatsuma, Shinji; Goto, Tetsuo*; Sakai, Hitoshi*; Chigira, Takayuki*; et al.

Proceedings of International Nuclear Fuel Cycle Conference; Nuclear Energy at a Crossroads (GLOBAL 2013) (CD-ROM), p.272 - 277, 2013/09

JAEA Reports

Survey report of regulation trend relate to uranium bearing waste in an international organization and foreign countries

Ouchi, Masaru; Takebe, Shinichi; Kawatsuma, Shinji; Fukushima, Tadashi*

JAEA-Review 2012-019, 186 Pages, 2013/02

JAEA-Review-2012-019.pdf:11.86MB

We have reviewed information about justification for establishing uranium bearing waste acceptance for near surface disposal (trench and concrete pit disposals) in foreign countries, to intend to discuss clearance level and disposal of uranium bearing waste in Japan. Most of EU countries have adopted the unconditional clearance level 1 Bq/g described in EU Guidance RP 122 Part 1 and IAEA Safety Guide RS-G-1.7 for uranium wastes. And in the case of special landfill burial, the conditional clearance level about 10 Bq/g (equivalent to exemption level) has been adopted in Germany, Sweden and UK.

Journal Articles

Overview and issues to be solved on emergency response of robots to Fukushima NPP accidents

Kawatsuma, Shinji

Dekomisshoningu Giho, (46), p.14 - 26, 2012/09

Fukushima NPP accident was occurred according to the earthquake of East Japan on the Pacific Ocean, on March 11th, 2011. Nuclear Disaster Robots, developed after JCO criticality accident, had been discarded, or stored but not maintained, so that those robots could not been deployed immediately. After that, Unmanned heavy construction machines, PackBOTs, BROKKs, Quince and other robots have been deployed. Development of the remote equipments for decommissioning of the Fukushima Nuclear Power Plants and preparation of maintenance and employment of the remote equipments in case of nuclear urgent are advanced. This paper summarized robots' emergency response to Fukushima NPP accident and future subjects, in order for the development and preparation mentioned above.

Journal Articles

Basic of radiation and contamination control of construction heavy machines

Kawatsuma, Shinji

Kensetsu No Seko Kikaku, (749), p.67 - 71, 2012/07

Accidents at Fukushima Nuclear Power Station occurred on March 11th, 2011, and many construction heavy machines have been deployed. Maintenance task is very important for keeping those machines normal. However, it is subject that those machines are contaminated by radioactive materials. This paper overhaules affects to human by radiation as "basic of radiation" and show that the affects, by less than 100 mSv radiation, is little. Also, this paper introduce practical example of contamination control of construction heavy machines, in order to reduce radiation exposure to workers for maintenance, and overhaules methods of contamination control.

Journal Articles

Decontamination experiment for floor of Fukushima Daiichi reactor building

Kanayama, Fumihiko; Hayashi, Takehiro; Kawatsuma, Shinji

Proceedings of American Nuclear Society Embedded Topical on Decommissioning, Decontamination and Reutilization and Technology Expo (DD&R 2012) (DVD-ROM), p.14 - 15, 2012/06

no abstracts in English

Journal Articles

Radiological emergency response to Fukushima Daiichi Accident; Teleoperation & robotics of JAEA

Fukushima, Mineo; Kawatsuma, Shinji; Okada, Takashi

Proceedings of American Nuclear Society Embedded Topical on Decommissioning, Decontamination and Reutilization and Technology Expo (DD&R 2012) (DVD-ROM), p.67 - 68, 2012/06

The accident on Fukushima Daiichi Nuclear Power Plant has been occurred by the TSUNAMI that generated form Great East Japan Earthquake happened in 11th March 2011. Just after the earthquake, JAEA is assisting activities concerning the accident of the Fukushima No.1 Nuclear Power Station including teleoperation, decontamination and radiation monitoring in the site. JAEA had already developed some robotics, RESQ series, for radiological emergency response in 2001, after JCO criticality accidents occurred. However, they could not work for the NPP because of lack of maintenance. According to the situation and condition of the FUKUSHIMA-DAIICHI accident, JAEA has modified above mentioned robotics and prepared supporting equipments like as Robotics control vehicles. JAEA has provided Robotics and Robotics Control vehicles to TEPCO and is continuously supporting Tokyo Electric Company for plant restoration.

Journal Articles

Summary and lessons learned on emergency response to Fukushima Dai-ichi Nuclear Power Station accidents by robots

Kawatsuma, Shinji

Robotto, (206), p.39 - 46, 2012/05

Accidents at Fukushima Dai-ichi Nuclear Power Station, were occurred by earthquakes of North East Japan on the Pacific Ocean on March 11th, 2011. Nuclear disaster robots, developed after JCO criticality accidents occurred, could not be deployed immediately, because those robots had been discarded or had not been maintained. After that, unmanned construction machines, PackBOT robots developed in USA, BROKK robots developed in Sweden, Quince robots developed by Chiba Institute of Technology, Tohoku University and International rescue systems, have been deployed. Based on the experiences of emergency responses and restoration operations by those robots, it was lessons learned that operational organization, systemization, conformity capabilities are very important.

Journal Articles

Emergency response by robots to Fukushima-Daiichi accident; Summary and lessons learned

Kawatsuma, Shinji; Fukushima, Mineo; Okada, Takashi

Industrial Robot; An International Journal, 39(5), p.428 - 435, 2012/00

 Times Cited Count:83 Percentile:95.57(Engineering, Industrial)

JAEA Reports

A Study for the safety evaluation of geological disposal of TRU waste and influence on disposal site design by change of amount of TRU waste (Joint research)

Hasegawa, Makoto; Kondo, Hitoshi; Kamei, Gento; Hirano, Fumio; Mihara, Morihiro; Takahashi, Kuniaki; Funabashi, Hideyuki; Kawatsuma, Shinji; Ueda, Hiroyoshi*; Oi, Takao*; et al.

JAEA-Research 2011-003, 47 Pages, 2011/02

JAEA-Research-2011-003.pdf:3.99MB

In 2009, NUMO and JAEA set up a technical commission to investigate the reasonable TRU waste disposal following a cooperation agreement between these two organizations. In this report, the calculation result of radionuclide transport for a TRU waste geological disposal system was described, by using the TIGER code and the GoldSim code at identical terms. Comparing the calculation result, a big difference was not seen. Therefore, the reliability of both codes was able to be confirmed. Moreover, the influence on the disposal site design (Disposal capacity: 19,000 m$$^{3}$$) was examined when 10% of the amount of TRU waste increased. As a result, it was confirmed that the influence of the site design was very little based on the concept of the Second Progress Report on Research and Development for TRU Waste Disposal in Japan.

Journal Articles

Uranium distribution in the environment and its contribution to environmental radioactivity

Sato, Kazuhiko; Ishibashi, Makoto*; Kawatsuma, Shinji

Dekomisshoningu Giho, (38), p.2 - 10, 2008/11

Clearance of materials and disposal of radioactive waste generated from uranium utilizing facilities which include uranium conversion and enrichment facilities, and fuel fabrication facility among the nuclear fuel cycle has been discussed in Japan. These materials are supposed to be contaminated with long-lived natural nuclide, i.e. uranium. Uranium is widely distributed among the environment, e.g. soil, rock, river-water, groundwater and so on. Furthermore, uranium is also contained in some building materials and consumer goods. Literature survey about distribution of uranium in the environment and measurement of uranium concentration in some materials were carried out. As a result, it is revealed that range of U-238 activities in soils in Japan is from 0.001 Bq/g to about 1 Bq/g. Addition to that, the range of building materials is overlapped by that of soils, while some consumer goods showed relatively high activities. Futermore, dose contribution of uranium series nuclides to the environmental radiation dose were discussed. It is suggested that, sum of environmental radiation dose in Japan is about 1.5 mSv/yr and dose contribution of uranium series nuclides is about 0.8 mSv/yr.

Journal Articles

Natural uranium nuclides in the environment of Japan

Ishibashi, Makoto*; Sato, Kazuhiko; Kawatsuma, Shinji

Proceedings of 16th Pacific Basin Nuclear Conference (PBNC-16) (CD-ROM), 6 Pages, 2008/10

no abstracts in English

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