Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 20
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

JAEA Reports

Development of "MOX weighing and Ball-mill blending" based on experience in operation and maintenance of MOX fuel manufacturing equipment

Kawasaki, Kohei; Ono, Takanori; Shibanuma, Kimikazu; Goto, Kenta; Aita, Takahiro; Okamoto, Naritoshi; Shinada, Kenta; Ichige, Hidekazu; Takase, Tatsuya; Osaka, Yuki; et al.

JAEA-Technology 2022-031, 91 Pages, 2023/02

JAEA-Technology-2022-031.pdf:6.57MB

The document for back-end policy opened to the public in 2018 by Japan Atomic Energy Agency (hereafter, JAEA) states the decommissioning of facilities of Nuclear Fuel Cycle Engineering Laboratories and JAEA have started gathering up nuclear fuel material of the facilities into Plutonium Fuel Production Facilities (hereafter, PFPF) in order to put it long-term, stable and safe storage. Because we planned to manufacture scrap assemblies almost same with Monju fuel assembly using unsealed plutonium-uranium mixed-oxide (hereafter, MOX) powder held in PFPF and transfer them to storage facilities as part of this "concentration" task of nuclear fuel material, we obtained permission to change the use of nuclear fuel material in response to the new regulatory Requirements in Japan for that. The amount of plutonium (which is neither sintered pellets nor in a lidded powder-transport container) that could be handled in the pellet-manufacturing process was limited to 50 kg Pu or less in order to decrease the facility risk in this manufacture. Therefore, we developed and installed the "MOX weighing and blending equipment" corresponding with small batch sizes that functioned in a starting process and the equipment would decrease handling amounts of plutonium on its downstream processes. The failure data based on our operation and maintenance experiences of MOX fuel production facilities was reflected in the design of the equipment to further improve reliability and maintainability in this development. The completed equipment started its operation using MOX powder in February 2022 and the design has been validated through this half-a-year operation. This report organizes the knowledge obtained through the development of the equipment, the evaluation of the design based on the half-a-year operation results and the issues in future equipment development.

Journal Articles

Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi

Otsuka, Yusuke*; Kanazawa, Naoya*; Hirayama, Motoaki*; Matsui, Akira*; Nomoto, Takuya*; Arita, Ryotaro*; Nakajima, Taro*; Hanashima, Takayasu*; Ukleev, V.*; Aoki, Hiroyuki; et al.

Science Advances (Internet), 7(47), p.eabj0498_1 - eabj0498_9, 2021/11

 Times Cited Count:3 Percentile:42.29(Multidisciplinary Sciences)

JAEA Reports

Development of fireproof sheet on glove box panels

Kawasaki, Kohei; Shinada, Kenta; Okamoto, Naritoshi; Kageyama, Tomio; Eda, Takashi; Okazaki, Hiro; Suzuki, Hiromichi; Yamamoto, Kazuya; Otabe, Jun

JAEA-Technology 2020-025, 80 Pages, 2021/03

JAEA-Technology-2020-025.pdf:3.72MB

Plutonium Fuel Production Facility was built in 1988 for the purpose of mainly producing MOX fuel of the prototype fast breeder reactor MONJU, and large glove boxes were installed for handling unsealed nuclear fuel material remotely. The panels of these glove boxes are made of acrylic, except for those installed after December 2013. For fires inside the glove box, automatic fire extinguishing systems using halides have been introduced since the beginning of construction, but for fires outside the glove box, there have been issues with direct measures for acrylic. Therefore, we have developed a fireproof sheet that mitigates the effect of fire outside the glove box on the panels as much as possible. As a result, fire-retardant sheets have been selected and attached to the glove box panels. We conducted a flammability test of the acrylic plate attached with these fireproof sheets and a usage environment influence test of fireproof sheets, and obtained good results. In addition, we set up a working group in the Plutonium Fuel Development Center in view of reducing external exposure during the work of attaching fireproof sheets, in which we discussed and examined the work procedure, and summarized it in the basic procedure manual.

Journal Articles

Experimental evidence for ferromagnetic spin-pairing superconductivity emerging in UGe$$_2$$; A $$^{73}$$Ge-nuclear-quadrupole-resonance study under pressure

Harada, Atsushi*; Kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Physical Review B, 75(14), p.140502_1 - 140502_4, 2007/04

 Times Cited Count:28 Percentile:72.28(Materials Science, Multidisciplinary)

This paper reports that a different type of superconducting order parameter has been realized in the ferromagnetic states in UGe$$_2$$ via $$^{73}$$Ge-nuclear-quadrupole-resonance experiments performed under pressure. Measurements of the nuclear spin-lattice relaxation rate (1/$$T$$$rm$_1$$) have revealed an unconventional nature of superconductivity such that the up-spin band is gapped with line nodes, but the down-spin band remains gapless at the Fermi level. This result is consistent with that of a ferromagnetic spin-pairing model in which Cooper pairs are formed among ferromagnetically polarized electrons. The present experiment has shed light on the possible origin of ferromagnetic superconductivity, which is mediated by ferromagnetic spin-density fluctuations relevant to the first-order transition inside the ferromagnetic states.

Journal Articles

Unconventional supercondnuctivity in the itinerant ferromagnet UGe$$_2$$; $$^{73}$$Ge-NQR study under pressure

Harada, Atsushi*; Kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Physica B; Condensed Matter, 378-380, p.963 - 964, 2006/05

 Times Cited Count:1 Percentile:6.65(Physics, Condensed Matter)

The superconducting characteristics on the itinerant ferromagnetic superconductor UGe$$_2$$ have been investigated via the $$^{73}$$Ge-NQR measurements under pressure ($$P$$) near the critical pressure $$P_x$$ where the first-order transition takes place from the low-temperature ($$T$$) and low-$$P$$ ferromagnetic phase (FM2) to high-$$T$$ and high-$$P$$ one (FM1). The measurements of nuclear spin-lattice relaxation rate $$T_1$$ have revealed a power-law like behavior as $$T^n$$ without the coherence peak, whereas at low temperatures, it deviates from the $$T^n$$ dependence to a $$T$$-linear like behavior. These results that depend on the pressure are well understood in terms of non-unitary spin-triplet pairing state where the ferromagnetic up-spin band is gapped, but the down-spin band remains gapless at the Fermi level. We will argue an intimate relationship of the onset of SC with FM1 and FM2.

Journal Articles

Cooperative phenomenon of ferromagnetism and unconventional superconductivity in UGe$$_2$$; A $$^{73}$$Ge-NQR study under pressure

Harada, Atsuyuki*; Kawasaki, Shinji*; Kotegawa, Hisashi*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Journal of the Physical Society of Japan, 74(10), p.2675 - 2678, 2005/10

 Times Cited Count:20 Percentile:68.7(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Spin wave and orbital ordering in the C-type antiferromagnetic phase of Nd$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$

Kajimoto, Ryoichi; Yoshizawa, Hideki*; Kawasaki, Ryuichi*; Noda, Kohei*; Kuwahara, Hideki*

Journal of the Physical Society of Japan, 74(1), p.502 - 503, 2005/01

 Times Cited Count:2 Percentile:19.79(Physics, Multidisciplinary)

The spin wave dispersion relation of the C-type antiferromagnetic structure in Nd$$_{0.25}$$Sr$$_{0.75}$$MnO$$_{3}$$ was determined by neutron scattering. The spin exchange interactions show a large anisotropy, which evidences the d$$_{3z^2-r^2}$$ orbital ordering along the $$c$$ axis. The exchange interaction along the $$c$$ direction is fairly large and similar to the value in the ferromagnetic metallic phase, suggesting there is finite hopping of charges along the orbital chains.

Oral presentation

Influence of $$alpha$$-ray irradiation on mechanical strength of polycarbonate material

Kawasaki, Kohei

no journal, , 

no abstracts in English

Oral presentation

Improvement of fireproof performance by sealing the fire-retardant sheet on glove box panels, 2; Influence of usage conditions on glove box panels

Shinada, Kenta; Kawasaki, Kohei; Makino, Takayoshi; Okamoto, Naritoshi

no journal, , 

no abstracts in English

Oral presentation

Improvement of fireproof performance by sealing the fire-retardant sheet on glove box panels, 1; Influence of burning on glove box panels

Kawasaki, Kohei; Shinada, Kenta; Makino, Takayoshi; Okamoto, Naritoshi

no journal, , 

no abstracts in English

Oral presentation

Contamination in the controlled area at the Plutonium Fuel Fabrication Facility in Nuclear Fuel Cycle Engineering Laboratories, 3; Improvement of manuals for body radioactive decontamination

Yoshida, Tadayoshi; Isozaki, Kohei; Tamura, Ken; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Contamination in the controlled area at the Plutonium Fuel Fabrication Facility in Nuclear Fuel Cycle Engineering Laboratories, 2; Problems on radiation management and countermeasures

Tamura, Ken; Isozaki, Kohei; Yoshida, Tadayoshi; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Contamination in the controlled area at the Plutonium Fuel Fabrication Facility in Nuclear Fuel Cycle Engineering Laboratories, 1; Brief overview of the event

Isozaki, Kohei; Tamura, Ken; Yoshida, Tadayoshi; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Acquisition and analysis of alpha-radioactivity data for glove box dismantling

Yoshida, Masato; Kawasaki, Kohei; Aita, Takahiro; Tsubota, Yoichi; Kikuchi, Ryo*; Honda, Fumiya

no journal, , 

no abstracts in English

Oral presentation

Evaluation of ultraviolet on fire-retardant sheet for glove box panels

Kawasaki, Kohei

no journal, , 

no abstracts in English

Oral presentation

Development of MOX weighting and blending equipment on Plutonium Fuel Production Facility

Kawasaki, Kohei; Shinada, Kenta; Okamoto, Naritoshi; Ono, Takanori; Shibanuma, Kimikazu; Goto, Kenta

no journal, , 

Plutonium Fuel Production Facility of JAEA plans to produce waste packages with stable sealed state by processing MOX powder into pellet. Therefore, we have developed Weighting and blending equipment with improved reliability and maintainability based on experience of operation and maintenance the fast reactor MOX fuel.

Oral presentation

Study on optimization method for contamination inspection of vehicles in nuclear emergency, 1; Quick measurement by existent portable radiation portal monitors for vehicles

Hiraoka, Hirokazu; Kawasaki, Kohei*; Kimura, Masanori; Togawa, Orihiko; Saito, Shota; Ezaki, Iwao*

no journal, , 

When the nuclear emergency occurs, inhabitants take the contamination inspection to evacuate. A large number of vehicle will come to the inspection area and make there congested. To do the quick inspection, simultaneous measurement of tires and wipers using the portable radiation portal monitors for vehicles is a key point. Consequently, we attempted the count rates obtained from tires and wipers are discriminated. First, the vehicle was driven at 5 km/h and the $$gamma$$-ray counts rate was measured by the monitor. $$^{133}$$Ba sources were attached around the tire or on the wiper and measurements were taken 30 times each. Next, discrimination conditions based on a linear function were applied to the normalized count rates, with the maximum count rate of the measured values (Net value) set to 1.0, to evaluate the discrimination accuracy between the tire and the wiper. The evaluation results showed that the pattern with the source attached around the tire correctly discriminated 29 out of 30 times, while the pattern with the source attached on the wiper correctly discriminated 20 out of 30 times. It was found that in order to improve the accuracy of discrimination, the measurement method must be improved so that there is a large difference between measured values of the tire and the wiper.

Oral presentation

Study on optimization method for contamination inspection of vehicles in nuclear emergency, 2; Confirmation of the usefulness of the new set-up for portable radiation portal monitors for vehicles

Kawasaki, Kohei*; Hiraoka, Hirokazu; Ezaki, Iwao*; Kimura, Masanori; Togawa, Orihiko; Saito, Shota

no journal, , 

Vehicles carrying evacuees during a nuclear emergency are subject to contamination inspections, and the operation of screening by measuring tires and wiper are required. The introduction of portable radiation portal monitors for vehicles is expected to be quick tire inspections, however, it is difficult to inspect the tire and the wiper at the same time, so further speeding up the inspection process is an issue. In this study, we attempted to discriminate each type of contamination by using a different the new set up of detectors for the purpose of simultaneous inspection of tires and wiper. We will report the usefulness of the new set up and the results of simulation calculations of detector response under realistic contamination assumptions.

Oral presentation

Study on optimization method for contamination inspection of vehicles in nuclear emergency, 3; Verification of discriminative ability for contamination by the new set-up for portable radiation portal monitors for vehicles

Hiraoka, Hirokazu; Kawasaki, Kohei*; Kimura, Masanori; Togawa, Orihiko; Saito, Shota; Ezaki, Iwao*

no journal, , 

In nuclear emergency, vehicles which evacuating inhabitants use be taken the contamination inspection. For the quick inspection, it seems that realization of simultaneous inspection of tires and wipers by portable radiation portal monitors for vehicles is necessary. In order to fulfill the simultaneous inspection, the authors develop the measuring method which is able to suitably distinguish and evaluate each contamination. Monte Carlo simulation showed ahead that the new set-up of detectors improves the discriminative ability for contamination. In this study, based on the simulation results, the authors attached radiation sources to a vehicle, and verified the ability by the new-setup. As a result, the ability improved compared to one of the usual method.

Oral presentation

Applicability evaluation of lung monitor measurement for simultaneous ingestion of multiple nuclides assuming decommissioning work of Fukushima Daiichi Nuclear Power Plant

Watanabe, Yuki; Hosomi, Kenji; Kawasaki, Kohei*; Ezaki, Iwao*; Takada, Chie

no journal, , 

no abstracts in English

20 (Records 1-20 displayed on this page)
  • 1