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JAEA Reports

Development of technology to prevent scattering of radioactive materials in fuel debris retrieval (Contract research); FY2018 Center of World Intelligence Project for Nuclear Science/Technology and Human Resource Development

Collaborative Laboratories for Advanced Decommissioning Science; The University of Tokyo*

JAEA-Review 2019-037, 90 Pages, 2020/03

JAEA-Review-2019-037.pdf:7.0MB

JAEA/CLADS, had been conducting the Center of World Intelligence Project for Nuclear Science/Technology and Human Resource Development (hereafter referred to "the Project") in FY2018. The Project aims to contribute to solving problems in nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2018, this report summarizes the research results of the "Development of Technology to Prevent Scattering of Radioactive Materials in Fuel Debris Retrieval". The objective of the present study is to clarify the behavior of microparticles in gas and liquid phases in order to steadily confine radioactive microparticles at the time of debris retrieval in Fukushima Daiichi Nuclear Power Station. In addition, as measures to prevent scattering, we will evaluate and develop methods by experiments and simulation as to; (1) a method to suppress the scattering with minimum amount of water utilizing water spray etc., and (2) a method to suppress the scattering by solidifying fuel debris.

JAEA Reports

Restoration activity of the contamination accident at plutonium fuel research facility

Restoration Activity Team for the PFRF Contamination Incident

JAEA-Review 2019-001, 58 Pages, 2019/03

JAEA-Review-2019-001.pdf:10.74MB

The contamination accident occurred in a laboratory room (Room No.108) of Plutonium Fuel Research Facility (PFRF) in Japan Atomic Energy Agency (JAEA), Oarai Research and Development Institute on June 6, 2017. The polyvinyl chloride (PVC) bags burst just after the lid of one storage container was opened during the inspection of storage containers for U and Pu in the ventilation hood. At that time, part of nuclear materials in the storage container were scattered all over the room. Five workers in the room were subjected to plutonium contamination, which resulted in internal exposure. In order to restore the Room No.108 of PFRF, the Restoration Activity Team organized in JAEA carried out the decontamination work after the investigation of the contamination level in the room. The team decontaminated the surface of walls, ceiling, gloveboxes and other experimental instruments. Depending on the contamination distribution and installation state of the instruments, suitable decontamination methods were selected. In addition to the manual wiping using wet clothes, the exfoliation method using a strippable paint was applied for constricted areas. As a result, the loose alpha-contamination level fell below the detection limit throughout the room. On the other hand, the fixed contamination was covered with plastic sheets after the decontamination by a strippable paint. We hope that the restoration activity described in this report will provide useful information for the management of decommissioning facilities, especially for facilities treating alpha-radioactive materials such as plutonium.

Journal Articles

The Cause of corrosion occurred in a glove box filter casing and its repair technique

Mori, Eito; Yamamoto, Masahiko; Taguchi, Shigeo; Sato, Soichi; Kitao, Takahiko; Surugaya, Naoki

Nippon Hozen Gakkai Dai-11-Kai Gakujutsu Koenkai Yoshishu, p.132 - 138, 2014/07

The contamination of the radioactive material was observed on the filter casing surface of the glove box installed at the analytical laboratory in Tokai Reprocessing Plant. The cause of the contamination was investigated with visual inspection, penetrant testing and ultrasonic thickness measurement. It was found that a micro through-hole due to the corrosion of stainless-steel was generated in the glove box filter casing. The repair work of the filter casing was performed keeping the glove box negative pressure. The corrosion part of filter casing was replaced and newly fabricated casing was connected to the glove box with Tungsten Inert Gas welding method.

Journal Articles

High-sensitive detection by direct interrogation of 14 MeV Acc neutrons, 1; Uranium-contained metal matrix in a waste dram

Haruyama, Mitsuo; Takase, Misao*; Tobita, Hiroshi; Mori, Takamasa

Nippon Genshiryoku Gakkai Wabun Rombunshi, 3(2), p.185 - 192, 2004/06

no abstracts in English

JAEA Reports

Annual report on the services for chemical analysis and scientific glassblowing in the fiscal year 2001 and 2002

Ito, Mitsuo; Obara, Kazuhiro; Toida, Yukio*; Suzuki, Daisuke; Gunji, Katsubumi*; Watanabe, Kazuo

JAERI-Review 2004-007, 65 Pages, 2004/03

JAERI-Review-2004-007.pdf:5.53MB

no abstracts in English

JAEA Reports

Materials Science Symposium "Heavy Ion Science in Tandem Energy Region"; January 8-9, 2003

Ikezoe, Hiroshi; Yoshida, Tadashi; Takeuchi, Suehiro

JAERI-Conf 2003-017, 175 Pages, 2003/10

JAERI-Conf-2003-017.pdf:13.09MB

The facility of the JAERI tandem accelerator and its booster has been contributing to advancing heavy ion science researches in the fields of nuclear physics, nuclear chemistry, atomic and solid state physics and materials science, taking advantage of its prominent performances in providing various heavy ions. This meeting, as well as the previous ones held twice, offered scientists from the fields of heavy ion science, including nuclear physics, solid-state physics and cross-field physics, an opportunity to have active discussions among them, as well as to review their research accomplishments in the last two years. Oral presentations were selected from a wider scope of prospective fields, expecting a new step of advancing in heavy ion science. Main topics of the meeting were the status of the JAERI-KEK joint project of developing a radioactive nuclear beam(RNB) facility and research programs related to the RNB.

Journal Articles

Automatic measurement of low level contamination on concrete surfaces

Tachibana, Mitsuo; Ito, Hirokuni; Shimada, Taro; Yanagihara, Satoshi

Proceeding of International Waste Management Symposium 2002 (WM '02) (CD-ROM), 8 Pages, 2002/00

Automatic measurement of radioactivity is necessary for considering cost effectiveness in final radiological survey of building structures in decommissioning nuclear facilities. The RAPID (radiation measuring pilot device for surface contamination) was developed to be applied to automatic measurement of low level contamination on concrete surfaces. The RAPID has a capability to measure contamination with detection limit of 0.14 Bq/cm$$^{2}$$ for $$^{60}$$Co in 30 seconds of measurement time and its efficiency is evaluated to be 5 m$$^{2}$$/h in a normal measurement option. It was confirmed that low level contamination on concrete surfaces could be surveyed by the RAPID efficiently compared with direct measurement by workers through its actual application.

Journal Articles

Characterization of Fe-montmorillonite; A Simulant of buffer materials accommodating overpack corrosion product

Kozai, Naofumi; Adachi, Yoshifusa*; Kawamura, Sachi*; Inada, Koichi*; Kozaki, Tamotsu*; Sato, Seichi*; Ohashi, Hiroshi*; Onuki, Toshihiko; Bamba, Tsunetaka

Journal of Nuclear Science and Technology, 38(12), p.1141 - 1143, 2001/12

This study briefly reports characteristics of Fe-montmorillonite. Fe-montmorillonite was used as a simulant of buffer material in which corrosion products of carbon steel overpack, Fe$$^{2+}$$, were diffused. We have found that this clay retains Se(VI) for which natural montmorillonite, such as Na+-type and Ca$$^{2+}$$-type, has little retentivity.

Journal Articles

Effect of activation cross section change on the shallow land burial fraction of low activation materials for fusion reactors

Seki, Yasushi; Aoki, Isao; Ueda, Shuzo; Nishio, Satoshi; Kurihara, Ryoichi; Tabara, Takashi*

Fusion Technology, 34(3), p.353 - 357, 1998/11

no abstracts in English

Journal Articles

Tokamak reactor assessments in Europe:SEAFP/SEAL

Seki, Yasushi

Purazuma, Kaku Yugo Gakkai-Shi, 74(9), p.939 - 943, 1998/09

no abstracts in English

Journal Articles

Casting test for manufacturing recycled items from slightly radioactive metallic materials arising from decommissioning

Nakamura, Hisashi; Shindo, Hideaki

Proc. of 3rd European Technical Seminar on Melting and Recycling of Metallic waste Materials, p.79 - 91, 1997/00

no abstracts in English

Journal Articles

Synchrotron radiation beamline to study radioactive materials at the Photon Factory

Konishi, Hiroyuki; Yokoya, Akinari; Shiwaku, Hideaki; Motohashi, Haruhiko; *; Kashihara, Yasuharu*; *; Harami, Taikan; Sasaki, Teikichi; Maeta, Hiroshi; et al.

Nuclear Instruments and Methods in Physics Research A, 372, p.322 - 332, 1996/00

 Times Cited Count:47 Percentile:4.01(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Analysis on evolving environments of engineered barriers of high-level radioactive waste repositories during the first 1,000 years

*; *; *; *; *; *; ; Nagasaki, Shinya*

Nippon Genshiryoku Gakkai-Shi, 35(5), p.420 - 437, 1993/05

 Times Cited Count:6 Percentile:42.59(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of expert system for transport of radioactive materials

; *; ; ; Ikezawa, Yoshio

Proc. of the Int. Radiation Protection Association,Vol. II, p.1654 - 1657, 1993/00

no abstracts in English

JAEA Reports

Handbook for thermal analysis of radioactive material transport casks

JAERI-M 91-061, 119 Pages, 1991/04

JAERI-M-91-061.pdf:1.5MB

no abstracts in English

JAEA Reports

Handbook for structural analysis of radioactive material transport casks

JAERI-M 91-060, 164 Pages, 1991/04

JAERI-M-91-060.pdf:3.1MB

no abstracts in English

Journal Articles

Development of simplified computer codes for impact analysis of radioactive materials transport casks, 1st report; Computer code CRUSH for impact analysis of casks with shock absorbers

; *

Nippon Genshiryoku Gakkai-Shi, 33(4), p.381 - 390, 1991/04

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Journal Articles

Health and safety excecutive.Safety assessment principles for nuclear chemical plant.

Kosako, Toshiso*; *; *; *; *; *; Yamaki, J.;

Genshiryoku Kagaku Puranto Ni Taisuru Anzen Shinsa Shishin (Eikoku), 75 Pages, 1986/00

no abstracts in English

22 (Records 1-20 displayed on this page)