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JAEA Reports

Continuous improvement activities on nuclear facility maintenance in Nuclear Science Research Institute of Japan Atomic Energy Agency in 2021

Task Force on Maintenance Optimization of Nuclear Facilities

JAEA-Technology 2022-006, 80 Pages, 2022/06

JAEA-Technology-2022-006.pdf:4.24MB

The Task force on maintenance optimization of nuclear facilities was organized in the Nuclear Science Research Institute (NSRI) of Japan Atomic Energy Agency (JAEA) since November 2020, in order to adequately respond to "the New nuclear regulatory inspection system since FY 2020" and to continuously improve the facility maintenance activities. In 2021, the task force has studied (1) optimization of the importance classification on maintenance and inspection of nuclear facilities, and (2) improvement in setting and evaluation of the performance indicators on safety, maintenance and quality management activities, considering "the Graded approach" that is one of the basic methodologies in the new nuclear regulatory inspection system. Each nuclear facility (research reactors, nuclear fuel material usage facilities, others) in the NSRI will steadily improve their respective safety, maintenance and quality management activities, referring the review results suggested by the task force.

Journal Articles

Additive-free hydrothermal leaching method with low environmental burden for screening of strontium in soil

Kato, Takuma*; Nagaoka, Mika; Guo, H.*; Fujita, Hiroki; Aida, Taku*; Smith, R. L. Jr.*

Environmental Science and Pollution Research, 28(39), p.55725 - 55735, 2021/10

 Times Cited Count:0 Percentile:0(Environmental Sciences)

In this work, hydrothermal leaching was applied to simulated soils (clay minerals vermiculite, montmorillonite, kaolinite) and actual soils (Terunuma, Japan) to generate organic acids with the objective to develop an additive-free screening method for determination of Sr in soil. Stable strontium (SrCl$$_{2}$$) was adsorbed onto soils for study and ten organic acids were evaluated for leaching Sr from simulated soils under hydrothermal conditions (120 to 200$$^{circ}$$C) at concentrations up to 0.3 M. For strontium-adsorbed vermiculite (Sr-V), 0.1 M citric acid was found to be effective for leaching Sr at 150$$^{circ}$$C and 1 h treatment time. Based on these results, the formation of organic acids from organic matter in Terunuma soil was studied. Hydrothermal treatment of Terunuma soil produced a maximum amount of organic acids at 200$$^{circ}$$C and 0.5 h reaction time. To confirm the possibility for leaching of Sr from Terunuma soil, strontium-adsorbed Terunuma soil (Sr-S) was studied. For Sr-S, hydrothermal treatment at 200$$^{circ}$$C for 0.5 h reaction time allowed 40% of the Sr to be leached at room temperature, thus demonstrating an additive-free method for screening of Sr in soil. The additive-free hydrothermal leaching method avoids calcination of solids in the first step of chemical analysis and has application to both routine monitoring of metals in soils and to emergency situations.

Journal Articles

Waste management in a hot laboratory of Japan Atomic Energy Agency, 1; Overview and activities in chemical processing facility

Nomura, Kazunori; Ogi, Hiromichi*; Nakahara, Masaumi; Watanabe, So; Shibata, Atsuhiro

International Journal of Nuclear and Quantum Engineering (Internet), 13(5), p.209 - 212, 2019/00

Journal Articles

Estimation of the inventory of the radioactive wastes in Fukushima Daiichi NPS with a radionuclide transport model in the contaminated water

Shibata, Atsuhiro; Koma, Yoshikazu; Oi, Takao

Journal of Nuclear Science and Technology, 53(12), p.1933 - 1942, 2016/12

 Times Cited Count:14 Percentile:85.15(Nuclear Science & Technology)

JAEA Reports

Development of dismantling technology for nuclear fuel facility; Discussion of dismantling method for Old Waste Treatment Facility for JOYO

Morita, Kenji; Morimoto, Makoto; Hisada, Masaki; Fukui, Yasutaka

JAEA-Technology 2015-038, 30 Pages, 2016/02

JAEA-Technology-2015-038.pdf:14.65MB

The Old Waste Treatment Facility for JOYO (Old JWTF) has been operated to treat radioactive liquid waste from the experimental fast reactor JOYO and post irradiation examination facilities. Operation of Old JWTF stopped in 1995, and dismantling & decontamination method has discussed. As a response to discussion results of remote and dismantling method in high dose environment on 2013, its concept examination was discussed on 2014. Results are follows. As a cutting tool for Old JWTF equipment, wire saw is selected from cutting ability (speed and thickness of objects). Discussed the component technology of wire saw remote operation system (handling, monitoring, collection method of secondary waste, else).

Journal Articles

Schiff based ligand containing nano-composite adsorbent for optical copper(II) ions removal from aqueous solutions

Awual, M. R.; Eldesoky, G. E.*; Yaita, Tsuyoshi; Naushad, M.*; Shiwaku, Hideaki; Alothman, Z. A.*; Suzuki, Shinichi

Chemical Engineering Journal, 279, p.639 - 647, 2015/11

 Times Cited Count:197 Percentile:99.28(Engineering, Environmental)

Journal Articles

Inventory estimation of $$^{137}$$Cs in radioactive wastes generated from contaminated water treatment system in Fukushima Daiichi Nuclear Power Station

Kato, Jun; Meguro, Yoshihiro

E-Journal of Advanced Maintenance (Internet), 7(2), p.138 - 144, 2015/08

Concentration of $$^{137}$$Cs in radioactive wastes such as used cesium adsorption vessels and sludge generated from the cesium adsorption device, the 2nd cesium adsorption device, and the decontamination device, which have operated or been suspended as a part of the contaminated water treatment system in Fukushima Daiichi Nuclear Power Stations, was calculated by using analysis data of the contaminated water. The total decontamination amount of $$^{137}$$Cs from Jun 6, 2011 to Aug 12, 2014 was estimated.

JAEA Reports

Investigation report on the ruptured glove of ash removing room in the waste treatment building No.1 in JAERI Tokai Research Establishment

JAERI's Internal Investigation Group on the Ruptured Glove; Department of Decommissioning and Waste Management

JAERI-Review 2002-017, 121 Pages, 2002/09

JAERI-Review-2002-017.pdf:13.36MB

On November 21st, 2001, the glove rupture arose at an incinerator of Waste Treatment Building No.1 in JAERI Tokai Research Establishment. In order to examine the cause and recurrence prevention measure of the rupture, JAERI's Internal Investigation Group on the Ruptured Glove investigated the conditions of the incinerator including ash removing equipment and the glove, types and properties of waste which was incinerated on that day, and background factor of the trouble in cooperation with Department of Decommissioning and Waste Management.As the result, the causes of the rupture were that the solidification of liquid scintillator waste was insufficient, that the protective cover of the glove does not have pressure resistance and the degraded glove was used. For preventing the recurrence of the trouble, the direct confirmation of the solidification condition, the installation of protective cover for the glove, the improvement of the management of the glove, review of manuals and education and training were carried out.

Journal Articles

Applicability of insoluble tannin to treatment of waste containing americium

; Usuda, Shigekazu

Journal of Alloys and Compounds, 271-273, p.244 - 247, 1998/00

 Times Cited Count:17 Percentile:69.98(Chemistry, Physical)

no abstracts in English

JAEA Reports

Conceptual design study and evaluation of an advanced treatment process applying a submerged combustion technique for spent solvents

Uchiyama, Gunzo; Maeda, Mitsuru; Fujine, Sachio; *; *

JAERI-M 93-213, 204 Pages, 1993/10

JAERI-M-93-213.pdf:6.12MB

no abstracts in English

JAEA Reports

Combustion behavior of spent solvent in a submerged combustion process

Uchiyama, Gunzo; Maeda, Mitsuru; Fujine, Sachio; *; *

JAERI-M 93-191, 58 Pages, 1993/10

JAERI-M-93-191.pdf:2.23MB

no abstracts in English

JAEA Reports

Health Physics in JAERI, No.34; April 1, 1991 - March 31, 1992

Department of Health Physics; ; Safety Division, Naka; Safety Division, Takasaki; ; ; Operation Safety Administration Division, Mutsu; ;

JAERI-M 92-144, 301 Pages, 1992/10

JAERI-M-92-144.pdf:8.94MB

no abstracts in English

Journal Articles

JAEA Reports

Health Physics in JAERI, No.33

Department of Health Physics; ; ; ; ; ;

JAERI-M 91-171, 294 Pages, 1991/11

JAERI-M-91-171.pdf:8.57MB

no abstracts in English

Journal Articles

The Incineration treatment of combustible solid waste at Tokai, JAERI

; ;

NGK Genshiryoku Giho, 0(3), p.4 - 13, 1991/03

no abstracts in English

Journal Articles

Chemical decontamination process with sulfuric acid-cerium(IV) for decommissioning; Decontamination of dismantled components

Suwa, Takeshi; *; *; Tachikawa, Enzo

Proc. of 1991 JAIF Int. Conf. on Water Chemistry in Nuclear Power Plants: Water Chemistry,91, p.737 - 742, 1991/00

no abstracts in English

JAEA Reports

Health physics in JAERI, No.32

Department of Health Physics; ; ; ; ; ;

JAERI-M 90-224, 270 Pages, 1990/12

JAERI-M-90-224.pdf:7.97MB

no abstracts in English

JAEA Reports

Health physics in JAERI, No.31

Department of Health Physics; ; ; ; ; ;

JAERI-M 89-212, 334 Pages, 1989/12

JAERI-M-89-212.pdf:9.28MB

no abstracts in English

32 (Records 1-20 displayed on this page)