Strategic roadmap for back-end technology development

Nakazawa, Osamu; Takiya, Hiroaki; Murakami, Masashi; Donomae, Yasushi; Meguro, Yoshihiro

JAEA-Review 2023-012, 6 Pages, 2023/08

JAEA-Review-2023-012.pdf:0.93MB

The selection of back-end technology development issues to be prioritized and their schedule of the Japan Atomic Energy Agency (JAEA) have been put together as the "Strategic Roadmap for Back-end Technology Development." The results of questionnaires on development technologies (seeds) and technical issues (needs) within JAEA conducted in FY2022 were reflected in the selection. The issues were extracted from among those that match the seeds and needs, from the perspective of early implementation in the work front and the perspective of common issues, and nine themes were selected. We will build a cross-organizational implementation framework within JAEA and aim to implement the development results in the work front as well as social implementation.

Study on the evaluation method to determine the radioactivity concentration in radioactive waste on Oarai Research and Development Institute (FY2019)

Asakura, Kazuki; Shimomura, Yusuke; Donomae, Yasushi; Abe, Kazuyuki; Kitamura, Ryoichi

JAEA-Review 2020-015, 66 Pages, 2020/09

JAEA-Review-2020-015.pdf:4.27MB

The disposal of radioactive waste from the research facility need to calculated from the radioactivity concentration that based on variously nuclear fuels and materials. In Japan Atomic Energy Oarai Research and Development Institute, the study on considering disposal is being advanced among the facilities which generate radioactive waste as well as the facilities which process radioactive waste. This report summarizes a study result in FY2019 about the evaluation method to determine the radioactivity concentration in radioactive waste on Oarai Research and Development Institute.

Melting decontamination and free release of metal waste at Studsvik Radwaste Co. in Sweden

Kawatsuma, Shinji; Ishikawa, Keiji; Matsubara, Tatsuo; Donomae, Yasushi; Imagawa, Yasuhiro

Dekomisshoningu Giho, (33), p.67 - 74, 2006/03

http://www.randec.or.jp/publish/documents/gihou/Decommissioning%20gihou_33.pdf

no abstracts in English

Rationalization design on large equipment dismantling facility; The cell fire-extinguishing examination I

Donomae, Yasushi; Matsumoto, Yoshihiro; Kikuchi, Yutaka; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi

JNC TN9410 2001-021, 73 Pages, 2002/01

JNC-TN9410-2001-021.pdf:3.91MB

In order to rationalize for Large Equipment Dismantling Facility (LEDF), the plan of removing vaporizer belong to Cell-fire-extinguishing-system was investigated. In this test, in order to study the behavior of pressure in cell, when the liquefaction carbon dioxide (liq-CO) is emitted, and the performanee of extinguishing fires, the test of behavior of pressure and the extinguishing fires take effect. Also the extinguishing fires test used water-mist take effect for complement liq-CO. The results as follows; (1)In the test of behavior of pressure, Liq-CO was emitted test room under -40mmAq negative pressure. Room pressure was increase about 0.8mmAq/sec at first. After 29sec, the pressure was increase slowly about 0.1mmAq/sec. After 120sec, the increase was drastic about 1.5mmAq/s. (2)In the test of extinguishing fires by liq-CO, under -40mmAq, Polyethylene and wooden chips + cotton (crib) was burn. Polyethylene was extinguished perfectly, but the embers remained in cribs. While the room pressure was increase about 1.3mmAq/sec for 10sec at first. After 30 sec, the pressure was increase about 1mmAq/sec. On the other hand, the drastic increase of pressure disappeared between 100sec to 120sec by change the nozzle size from 14mm to 10mm. (3)In the test of extinguishing fires by water-mist, Cribs was extinguished perfectly, but Polyethylene was extinguished difficulty under the same condition of liq-CO test. (4)Therefore the results, It's coped with the fire extinguishing and the keeping negative pressure for LEDF cells. Therefore nozzle size is fitted cell volume as changing 14mm to 10mm. (5)As the performance of extinguishing fires by liq-CO, It is necessity the concentration of above 50% CO for combustibles as cribs, remaining the embers. (6)On the other hand, It is necessity most study for the adoption of water-mist. Therefore water-mist was not effective for polyethylene, and it needed water ...

Demonstration of incinerating and melting system by high frequency induction furnace, 1; Demonstration of incinerating and melting system

Kakuta, Toshiya*; Kuchiki, Norikazu*; Sato, Koji*; Matsumoto, Takeshi; Donomae, Yasushi

no journal, , 

JP, 2007-218796   Patent publication (In Japanese)

no abstracts in English

Study on the evaluation method to determine the radioactivity concentration in radioactive waste on Oarai Research and Development Institute, 2

Asakura, Kazuki; Shimomura, Yusuke; Donomae, Yasushi; Abe, Kazuyuki; Kitamura, Ryoichi

no journal, , 

no abstracts in English

放射性廃棄物処理方法

原田 守; 堂野前 寧

佐藤 康士*; 朽木 憲一*; 角田 俊也*

JP, 2007-218796  Patent licensing information  Patent publication (In Japanese)

【課題】放射性廃棄物を装填し、当該廃棄物を高周波加熱装置で加熱溶融して減容させるキャニスタと、外容器とを組み合わせて二重複合容器を構成したものについて、キャニスタから溶融物漏洩があっても、それが外容器の外に流出しないようにし、かつ、溶融物漏洩があった場合の後処理作業を遠隔ハンドリングで簡単容易に行えるようにすること。 【解決手段】放射性廃棄物を装填し、当該廃棄物を高周波加熱装置で加熱溶融して減容させる放射性廃棄物減容容器について、キャニスタを外容器に嵌めて二重複合容器が構成されており、上記外容器が耐熱性セラミック容器であり、キャニスタとの間に隙間があり、キャニスタと外容器との間の隙間が遠隔操作治具を挿入してキャニスタを保持することができる大きさであること。

放射性廃棄物処理装置

原田 守; 堂野前 寧

佐藤 康士*; 朽木 憲一*; 角田 俊也*

JP, 2008-030686  Patent licensing information  Patent publication (In Japanese)

【課題】高周波加熱炉で可燃性廃棄物を焼却するについて、自然な空気流によって酸素を十分供給して可燃性廃棄物を完全燃焼させ、その焼却灰とともに不燃性廃棄物を加熱溶融させる放射性廃棄物の溶融処理を簡単容易に行えるようにする。 【解決手段】導電性の焼却器10を用いて高周波加熱して可燃性廃棄物を焼却し、その焼却灰Tと不燃性廃棄物をセラミック製キャニスタを用いて高周波加熱して溶融させる放射性廃棄物処理装置を前提として、上記焼却器10が互いに分離可能な灰受け皿と焼却筒12との組み合わせ体であり、上記焼却筒12の下部に火格子13があり、当該火格子13よりも下方において焼却筒12と灰受け皿とによってその間に空気通路が構成されており、上記焼却器10が高周波加熱炉1に装着された状態で、焼却筒12内及び上部空間が燃焼ゾーンになっている。