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JAEA Reports

Decommissioning state of Plutonium Fuel Fabrication Facility; Dismantling the glove box W-9 and equipment interior, and a part of tunnel F1

Nagai, Yuya; Shuji, Yoshiyuki; Kawasaki, Takeshi; Aita, Takahiro; Kimura, Yasuhisa; Nemoto, Yasunori*; Onuma, Takeshi*; Tomiyama, Noboru*; Hirano, Koji*; Usui, Yasuhiro*; et al.

JAEA-Technology 2022-039, 117 Pages, 2023/06

JAEA-Technology-2022-039.pdf:11.96MB

Japan Atomic Energy Agency (JAEA) manages wide range of nuclear facilities. Many of these facilities are required to be performed adjustment with the aging and complement with the new regulatory standards and the earthquake resistant, since the Great East Japan Earthquake and the Fukushima Daiichi Nuclear Power Station accident. It is therefore desirable to promote decommissioning of facilities that have reached the end of their productive life in order to reduce risk and maintenance costs. However, the progress of facility decommissioning require large amount of money and radioactive waste storage space. In order to address these issues, JAEA has formulated a "The Medium/Long-Term Management Plan of JAEA Facilities" with three pillars: (1) consolidation and prioritization of facilities, (2) assurance of facility safety, and (3) back-end countermeasures. In this plan, Plutonium Fuel Fabrication Facility has been selected as primary decommissioned facility, and dismantling of equipment in the facilities have been underway. In this report, size reduction activities of the glove box W-9 and a part of tunnel F-1, which was connected to W-9, are presented, and the obtained findings are highlighted. The glovebox W-9 had oxidation & reduction furnace, and pellet crushing machine as equipment interior. The duration of activity took six years from February 2014 to February 2020, including suspended period of 4 years due to the enhanced authorization approval process

Journal Articles

Neutron scattering studies on short- and long-range layer structures and related dynamics in imidazolium-based ionic liquids

Nemoto, Fumiya*; Kofu, Maiko; Nagao, Michihiro*; Oishi, Kazuki*; Takata, Shinichi; Suzuki, Junichi*; Yamada, Takeshi*; Shibata, Kaoru; Ueki, Takeshi*; Kitazawa, Yuzo*; et al.

Journal of Chemical Physics, 149(5), p.054502_1 - 054502_11, 2018/08

 Times Cited Count:18 Percentile:70.44(Chemistry, Physical)

Journal Articles

Focusing and spectral enhancement of a repetition-rated, laser-driven, divergent multi-MeV proton beam using permanent quadrupole magnets

Nishiuchi, Mamiko; Daito, Izuru; Ikegami, Masahiro; Daido, Hiroyuki; Mori, Michiaki; Orimo, Satoshi; Ogura, Koichi; Sagisaka, Akito; Yogo, Akifumi; Pirozhkov, A. S.; et al.

Applied Physics Letters, 94(6), p.061107_1 - 061107_3, 2009/02

 Times Cited Count:57 Percentile:87.53(Physics, Applied)

A pair of conventional permanent magnet quadrupoles is used to focus a 2.4 MeV laser-driven proton beam at a 1 Hz repetition rate. The magnetic field strengths are 55 T/m and 60 T/m for the first and second quadrupoles respectively. The proton beam is focused to a spot size (full width at half maximum) of 2.7$$times$$8 mm$$^{2}$$ at a distance of 650 mm from the source. This result is in good agreement with a Monte Carlo particle trajectory simulation.

JAEA Reports

Benchmark experiments of MOX fueled LMFBR using FCA-XVII-1 core

Ando, Masaki; Iijima, Susumu*; Oigawa, Hiroyuki; Sakurai, Takeshi; Nemoto, Tatsuo*; Okajima, Shigeaki; Osugi, Toshitaka*; Ono, Akio; Hayasaka, Katsuhisa; Sodeyama, Hiroshi

JAEA-Data/Code 2006-006, 67 Pages, 2006/03

JAEA-Data-Code-2006-006.pdf:6.08MB

As a part of research and development of an advanced fueled fast reactor, we carried out benchmark experiments in the FCA-XVII-1 core with MOX simulating fuel to obtain reference data to be compared with those measured in the FCA-XVI-1 and XVI-2 cores simulating metallic fueled FBR. Following nuclear characteristics were measured in the experiments: Criticality, reaction rate ratio, sample reactivity worth, sodium void reactivity effect and $$^{238}$$U Doppler effect. Extra measurements were performed in modified FCA-XVII-1 cores to obtain experimental data for various reactor types: (1) Measurement of sodium void reactivity effect in various plutonium isotope compositions, (2) Measurement of sodium void reactivity effect in a core where axial blanket was replaced with a sodium layer and (3) Measurement of various nuclear characteristics in a nitride fuel region. This report describes methods and results of the above experiments and method of analysis.

Journal Articles

Sensor noise caused by vibrations of flaw detection probe generated in helical heating tubes in a fast breeder reactor and its countermeasures, 2; Numerical simulations of probe vibration

Inoue, Takumi*; Sueoka, Atsuo*; Maehara, Takeshi*; Nakano, Hiroshi*; Kanemoto, Hiroyuki*; Murakami, Yukitaka*

Nihon Kikai Gakkai Rombunshu, C, 72(714), p.380 - 387, 2006/02

None

Journal Articles

Diagnostics system of JT-60U

Sugie, Tatsuo; Hatae, Takaki; Koide, Yoshihiko; Fujita, Takaaki; Kusama, Yoshinori; Nishitani, Takeo; Isayama, Akihiko; Sato, Masayasu; Shinohara, Koji; Asakura, Nobuyuki; et al.

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.482 - 511, 2002/09

 Times Cited Count:6 Percentile:3.03(Nuclear Science & Technology)

The diagnostic system of JT-60U (JT-60upgrade) is composed of about 50 individual diagnostic devices. Recently, the detailed radial profile measurements of plasma parameters have been improved, so that the internal structure of plasmas has been explored. The understanding of plasma confinement has been enhanced by density and temperature fluctuation measurements using a mm-wave reflectometer and electron cyclotron emission measurements respectively. In addition, the real-time control experiments of electron density, neutron yield, radiated power and electron temperature gradient have been carried out successfully by corresponding diagnostic devices. These measurements and the real time control contribute to improving plasma performance. Diagnostic devices for next generation fusion devices such as a CO2 laser interferometer/polarimeter and a CO2 laser collective Thomson scattering system have been developed.

Journal Articles

Analysis of single-ion multiple-bit upset in high-density DRAMs

Makihara, Akiko*; Shindo, Hiroyuki*; Nemoto, Norio*; Kuboyama, Satoshi*; Matsuda, Sumio*; Oshima, Takeshi; Hirao, Toshio; Ito, Hisayoshi; Buchner, S.*; Campbell, A. B.*

IEEE Transactions on Nuclear Science, 47(6), p.2400 - 2404, 2000/12

 Times Cited Count:33 Percentile:87.39(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Heating and non-inductive current drive by negative ion based NBI in JT-60U

Oikawa, Toshihiro; Ushigusa, Kenkichi; Forest, C. B.*; Nemoto, Masahiro; Naito, Osamu; Kusama, Yoshinori; Kamada, Yutaka; Tobita, Kenji; Suzuki, Shingo*; Fujita, Takaaki; et al.

Nuclear Fusion, 40(3Y), p.435 - 443, 2000/03

 Times Cited Count:41 Percentile:75.11(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

A Proposal of benchmark calculation on reactor physics for metallic fueled and MOX fueled LMFBR based upon mock-up experiment at FCA

Oigawa, Hiroyuki; Iijima, Susumu; Sakurai, Takeshi; Okajima, Shigeaki; Ando, Masaki; Nemoto, Tatsuo; Kato, Yuichi*; Osugi, Toshitaka

Journal of Nuclear Science and Technology, 37(2), p.186 - 201, 2000/02

no abstracts in English

Journal Articles

Analysis of single-ion multiple-bit upset in high-density DRAMs

Makihara, Akiko*; Shindo, Hiroyuki*; Nemoto, Norio*; Kuboyama, Satoshi*; Matsuda, Sumio*; Oshima, Takeshi; Hirao, Toshio; Ito, Hisayoshi; Buchner, S.*; Campbell, A. B.*

Proceedings of 4th International Workshop on Radiation Effects on Semiconductor Devices for Space Application, p.103 - 107, 2000/00

no abstracts in English

Journal Articles

The Irradiation facilities for the radiation tolerance testing of semiconductor devices for space use in Japan

Saido, Masahiro; Fukuda, Mitsuhiro; Arakawa, Kazuo; Tajima, Satoshi; Sunaga, Hiromi; Yotsumoto, Keiichi; Kamiya, Tomihiro; Tanaka, Ryuichi; Hirao, Toshio; Nashiyama, Isamu; et al.

Proceedings of 1999 IEEE Nuclear and Space Radiation Effects Conference, p.117 - 122, 1999/00

no abstracts in English

Journal Articles

Heating and non-inductive current drive by negative-ion based NBI in JT-60U

Oikawa, Toshihiro; Ushigusa, Kenkichi; Forest, C. B.*; Nemoto, Masahiro; Naito, Osamu; Kusama, Yoshinori; Kamada, Yutaka; Tobita, Kenji; Suzuki, Shingo*; Fujita, Takaaki; et al.

Fusion Energy 1998, Vol.2, p.551 - 558, 1998/10

no abstracts in English

Journal Articles

SEU testing using cocktail ion beams

Nemoto, N.*; Shindo, Hiroyuki*; *; Kuboyama, Satoshi*; Oshima, Takeshi; Ito, Hisayoshi; Nashiyama, Isamu; Matsuda, Sumio*

Proceedings of 3rd International Workshop on Radiation Effects on Semiconductor Devices for Space Application, p.154 - 159, 1998/00

no abstracts in English

Journal Articles

Transport and loss of energetic ions in JT-60U

Tobita, Kenji; Nishitani, Takeo; Harano, Hideki*; Tani, Keiji; Isobe, Mitsutaka*; Fujita, Takaaki; Kusama, Yoshinori; G.A.Wurden*; Shirai, Hiroshi; Oikawa, Toshihiro; et al.

Fusion Energy 1996, Vol.1, p.497 - 505, 1997/00

no abstracts in English

JAEA Reports

None

Nemoto, Takeshi; Numata, Koji; Okada, Takashi; ; ; ;

PNC TN8440 96-031, 20 Pages, 1996/07

PNC-TN8440-96-031.pdf:1.09MB

None

Journal Articles

None

; Nemoto, Takeshi; ;

Donen Giho, (97), p.122 - 125, 1996/03

None

Journal Articles

None

Numata, Koji; Nemoto, Takeshi;

Donen Giho, (94), p.72 - 77, 1995/06

None

JAEA Reports

None

; Nemoto, Takeshi; Numata, Koji; ; *; *; Hanawa, Eiji*

PNC TN8440 95-019, 22 Pages, 1995/04

PNC-TN8440-95-019.pdf:0.83MB

None

JAEA Reports

None

; Nemoto, Takeshi; Numata, Koji; *; *; Hanawa, Eiji*; *

PNC TN8440 94-011, 19 Pages, 1994/04

PNC-TN8440-94-011.pdf:0.42MB

None

JAEA Reports

None

Numata, Koji; Nemoto, Takeshi; Todokoro, Akio

PNC TN8410 94-216, 18 Pages, 1994/04

PNC-TN8410-94-216.pdf:0.37MB

None

43 (Records 1-20 displayed on this page)