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Journal Articles

Think of issues for treatment various waste from nuclear plant

Suzuki, Masafumi*; Yoshinaka, Kazuyuki

Gijutsushi, (648), p.12 - 15, 2020/12

The site tour which is a part of CPD events regarding the issue concerning the radioactive waste from nuclear facilities was organized in autumn 2019, and we visited the facilities related to the specified waste due to the Fukushima-Daiichi Nuclear Power Plant accident in spring 2020. The tours made us reacknowledge the impact of radionuclides on environment at accident, the importance of the management of nuclear facilities under the basic premise of ensuring safety, the necessity of the discussion based on the common understanding, and that would be contributed to find the solution of those issues.

Journal Articles

Development of human resources socially requested for nuclear and radiation technology

Yoshinaka, Kazuyuki

Gijutsushi, (634), p.8 - 11, 2019/10

Since the FUKUSHIMA-DAIICHI Nuclear Power Plant accident, a significant issue to develop human resources for nuclear and radiation technology has been growing up. A strong effort will be made, based on the serious experiences of troubles/accidents, to restore social confidence by developing engineers having high sense of ethics beyond logic of organization.

Journal Articles

The Case study of activities for safety of Onagawa Nuclear Power Plant

Yoshinaka, Kazuyuki

Gijutsushi, 29(11), p.12 - 15, 2017/11

AA2017-0334.pdf:0.47MB

We visited Onagawa NPP and discussed with the workers, for study of good practices at this plant, avoided severe accident, when the 3.11 earthquakes and tsunami disaster occurred. It was learned a part of background of the good practices, by discussion about organizational culture included in attitude for safety, philosophy of management, inheritance technology, and so on. It is important that we inform the knowledge leading safety culture analyzed from their experience to public, as professional engineer.

Journal Articles

R&D on treatment and disposal of waste resulting from Fukushima Daiichi accident

Wada, Ryutaro*; Yoshinaka, Kazuyuki

Gijutsushi, 28(11), p.4 - 7, 2016/11

AA2016-0292.pdf:0.44MB

It is one of the important subjects for decommissioning to establish the safe and effective waste management. Research and Development programs on the waste management for Fukushima-Daiichi as it differs from normal practices are conducted by IRID. We show the outline of the lecture presented by Mr.Miyamoto, Deputy Director of IRID.

Journal Articles

Status of research for fuel debris retrieval with remote technology

Yoshinaka, Kazuyuki

Gijutsushi, 28(10), p.4 - 7, 2016/10

AA2016-0264.pdf:0.32MB

For decommissioning the Fukushima-Daiichi Power Plant, various studies and activities have continued. In this paper, it was mainly described the status of research for fuel debris retrieval with remote technologies, which was the most difficult challenge, introduced in CPD program. Investigation and analyzing for debris condition in each reactor have done. Various researches and developments for the way of fuel debris retrieval with remote technology, including in access route, from the top or side, have continued with the result.

Journal Articles

Review and suggestion activities for textbooks of school education

Yoshinaka, Kazuyuki

Gijutsushi, 28(4), p.22 - 25, 2016/04

AA2015-0692.pdf:0.31MB

Atomic Energy Society of Japan (AESJ) has researched descriptions regarding energy, nuclear power and radiation in textbooks of school education for about 20 years, since 1995. In the activity on 2014 Japanese Fiscal Year(JFY), the research about textbooks to Nuclear and Radiation Group of IPEJ in attendance with professional engineers was requested and implemented. The research focused on the descriptions about the accident of Fukushima-Daiichi Nuclear Power Plant that was passed 4 years, was implemented. As the result, AESJ pointed out that some descriptions should be revised objectively, and there were some misleading descriptions, etc.

Journal Articles

2016 Professional Engineer (PE) test preparation course "Nuclear and Radiation Technical Disciplines"

Takahashi, Naoki; Yoshinaka, Kazuyuki; Harada, Akio; Yamanaka, Atsushi; Ueno, Takashi; Kurihara, Ryoichi; Suzuki, Soju; Takamatsu, Misao; Maeda, Shigetaka; Iseki, Atsushi; et al.

Nippon Genshiryoku Gakkai Homu Peji (Internet), 64 Pages, 2016/00

no abstracts in English

Journal Articles

Progress and foresight of maintenance technology in Tokai Reprocessing Plant

Yoshinaka, Kazuyuki; Abe, Sadayoshi

Gijutsushi, 27(6), p.4 - 7, 2015/06

AA2014-0901.pdf:0.46MB

In a reprocessing plant, some apparatuses are in severe corrosive condition, like exposure to boiling nitric acid. Safety functions, like fire prevention on organic solvent, are needed on some apparatuses. To maintain the apparatuses and functions, various inspections are performed. The features of the maintenance in high dose, are represented in experiences of remote operation. The way of decommissioning of Tokai Reprocessing Plant has been indicated last year. But importance of maintenance will not change, because the apparatuses for treatment of high level liquid waste will be used for long term. Continuing development of remote maintenance technology and contribution to decommissioning Fukushima Dai-ichi NPP are expected.

JAEA Reports

Leaching test of bituminized waste and waste solidified by epoxy resin

Yoshinaka, Kazuyuki; Takano, Yugo*; Kimura, Yukihiko*; Sugaya, Atsushi; Onizawa, Toshikazu

JAEA-Technology 2008-063, 135 Pages, 2008/10

JAEA-Technology-2008-063.pdf:5.88MB

This paper is reported that result of leaching tests for bituminized waste and Waste solidified by epoxy resin, done from 2003 to 2006. We've get precious knowledge and data, as follows. (1) In leaching tests for bituminized waste, it has detected iodine-129 peak, considered difficult too low energy $$gamma$$ to detect. We've get data and knowledge of iodine-129 behavior first. Leached radioactivity for 50 days calculated by peak area was equal for about 40% and 100% of including radioactivity in bituminized waste sample. And we've get data of behavior of nitric acid ion and so on, important to study for disposal, in various condition of sample shape or leaching liquid temperature. (2) In leaching test for waste solidified by epoxy resin, we've get data of behavior of TBP, radionuclides and so on.

Journal Articles

Development of fluorescent liquid penetrant test equipment

Yoshinaka, Kazuyuki; Otsuka, Masahiro*; Hoshino, Masato; Kikuchi, Kenji; Kawata, Tsuyoshi; Taki, Kiyotaka

Nippon Genshiryoku Gakkai Wabun Rombunshi, 7(3), p.268 - 279, 2008/09

The fluorescent liquid penetrant test equipment, for welding part in the evaporator for phosphate liquid waste generated by solvent waste treatment at Tokai reprocessing plant, was developed. It is composed of CCD camera and UV light for observation, sprinkling nozzles for fluorescent liquid, washing water and drying air, and positioning mechanism, which could be arranged position of the equipment to inspection object by 3 axes operation, insert length, bending angle and turn angle. Also, the equipment could be inserted by way of the nozzle, which inside diameter is 60 mm, into the evaporator for inspection. It was confirmed that it could be observed the standard faults, which was defined in JIS, by the equipment. Then, fluorescent liquid penetrant test for the evaporator, which has treated phosphate liquid waste for 18 years, and which heating temperature was about 105 centigrade degree, was done. As the result of the test, it was not observed fault in the evaporator.

Oral presentation

The Development of fluorescent liquid penetrant test equipment of the evaporator for phosphate liquid waste

Yoshinaka, Kazuyuki; Hoshino, Masato; Kikuchi, Kenji; Kawata, Tsuyoshi; Taki, Kiyotaka; Otsuka, Masahiro*

no journal, , 

no abstracts in English

Oral presentation

Current status and issues of the AESJ Education Committee's CPD Registration System

hamasaki, manabu*; Yoshinaka, Kazuyuki

no journal, , 

In 2008, the Atomic Energy Society of Japan (AESJ) launched its own Continuing Professional Development (CPD) registration system. But the system was not largely used by the Society members, which obliged to cease it only one year after the launch. In 2015 the AESJ Education Committee renewed and resumed its CPD registration system under the "Sunshine Policy", reflecting the lessons learned from the past failure. The renewed system has already attracted many users. On the other hand, some issues are emerging, including that the repeat users are quite limited.

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