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Journal Articles

Challenges for enhancing Fukushima environmental resilience, 4; Development of physical and heat treatment methods on aiming at decontamination, volume reduction and reuse of contaminated soil

Yaita, Tsuyoshi; Honda, Mitsunori; Shimoyama, Iwao; Ito, Kenichi*; Mampuku, Yuzo*; Tsuji, Takuya; Matsumura, Daiju

Nippon Genshiryoku Gakkai-Shi, 59(8), p.483 - 487, 2017/08

no abstracts in English

Journal Articles

Development of cesium-free mineralization for decontamination and reuse of radioactive contaminated soil in Fukushima

Shimoyama, Iwao; Honda, Mitsunori; Kogure, Toshihiro*; Baba, Yuji; Hirao, Norie*; Okamoto, Yoshihiro; Yaita, Tsuyoshi; Suzuki, Shinichi

Photon Factory News, 35(1), p.17 - 22, 2017/05

We introduce Cs-free mineralization (CFM) for Cs removal and reuse of radioactive-contaminated soil in Fukushima and report recent work conducted in the BL27A beamline in Photon Factory. In this work, we investigated compositional and structural changes of Cs-sorbed weathered biotite (WB) before and after heating treatment with addition of NaCl-CaCl$$_{2}$$ salts under low-pressure condition, to study Cs desorption mechanism from clay minerals. X-ray fluorescence spectroscopy clarified that almost all Cs and K were removed with the salts at 700 $$^{circ}$$C. On the other hand, Ca increased with heating temperature. X-ray diffraction and transmission electron microscopy analysis clarified that phase transitions from WB to some Ca-rich silicate minerals, e.g., augite, were caused by the heating treatment with the salt. Based on these results, CFM is proposed for Cs removal utilizing the mechanism in which large monovalent cations are discharged with accompanying the phase transition. We also discuss the role of Cl in this reaction showing chemical bonding change of Cl observed using X-ray absorption spectroscopy in the early stage of the chemical reaction.

Journal Articles

High temperature annealing effects on deep-level defects in a high purity semi-insulating 4H-SiC substrate

Iwamoto, Naoya*; Azarov, A.*; Oshima, Takeshi; Moe, A. M. M.*; Svensson, B. G.*

Journal of Applied Physics, 118(4), p.045705_1 - 045705_8, 2015/07

 Times Cited Count:2 Percentile:84.71(Physics, Applied)

Journal Articles

Effect of heat treatments on mechanical properties and microstructures of 8Cr-2W(F82H) steel doped with boron or boron and nitrogen

Wakai, Eiichi; Sato, Michitaka*; Okubo, Nariaki; Sawai, Tomotsugu; Shiba, Kiyoyuki; Jitsukawa, Shiro

Nippon Kinzoku Gakkai-Shi, 69(6), p.460 - 464, 2005/06

 Times Cited Count:1 Percentile:81.76(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Challenge of the development of high performance SiC semiconductor devices

Oshima, Takeshi

Hoshasen To Sangyo, (105), p.12 - 18, 2005/03

no abstracts in English

Journal Articles

Mechanical tests on the welding part of SS316LN after heat treatment for Nb$$_{3}$$Sn superconducting conductor

Kudo, Yusuke; Sakasai, Akira; Hamada, Kazuya; Takano, Katsutoshi*; Nakajima, Hideo; Okuno, Kiyoshi; Matsukawa, Makoto; Tamai, Hiroshi; Ishida, Shinichi

Journal of Nuclear Materials, 329-333(Part1), p.634 - 638, 2004/08

 Times Cited Count:1 Percentile:88.67(Materials Science, Multidisciplinary)

Japan Atomic Energy Research Institute (JAERI) has a plan to construct a tokamak fusion device called JT-60SC in which superconducting magnet system will be used. The objectives of this study are to clarify applicability of conventional austenitic stainless steel wire for the SS316LN to the conduit material of the Nb3Sn cable-in-conduit conductor for the central solenoid (CS) of JT-60SC. Tensile properties, fracture toughness and fatigue crack growth rate of both as-weld and aged (923 K $$times$$ 240 hours) weld metals were evaluated at 4 K. The measured tensile properties of aged weld metal satisfied the requirement of JT-60SC. Fatigue crack growth property was enough to ensure the required operation cycles of 9.0 $$times$$ 10e4. However, fracture toughness of aged weld metal could not be validated due to unstable crack extension. It was concluded that improvement of fracture toughness after aging was required to ensure the structural integrity of the CS conduit.

Journal Articles

Effect of initial heat treatment on tensile properties of F82H steel irradiated by neutrons

Wakai, Eiichi; Taguchi, Tomitsugu; Yamamoto, Toshio*; Kato, Yoshiaki; Takada, Fumiki

Materials Transactions, 45(8), p.2638 - 2640, 2004/08

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Inhibition of sensitization in reactor pipe materials by grain boundary structure control, JAERI's nuclear research promotion program, H11-023 (Contract research)

Kokawa, Hiroyuki*; Shimada, Masayuki*; Wang, Z.*; Sato, Yutaka*; Sato, Yoshihiro*; Kiuchi, Kiyoshi

JAERI-Tech 2003-014, 22 Pages, 2003/03

JAERI-Tech-2003-014.pdf:1.68MB

no abstracts in English

Journal Articles

Post-implantation annealing effects on the surface morphology and electrical characteristics of 6H-SiC implanted with aluminum

Oi, Akihiko; Oshima, Takeshi; Yoshikawa, Masahito; Lee, K. K.; Iwami, Motohiro*; Ito, Hisayoshi

Materials Science Forum, 389-393, p.831 - 834, 2002/05

no abstracts in English

Journal Articles

Production of a 11 km long jerry roll processed Nb$$_{3}$$Al strand with high copper ratio of 4 for fusion magnets

Hosono, F.*; Iwaki, G.*; Kikuchi, Kenichi*; Ishida, Shinichi; Ando, Toshinari*; Kizu, Kaname; Miura, Yushi; Sakasai, Akira

IEEE Transactions on Applied Superconductivity, 12(1), p.1037 - 1040, 2002/03

 Times Cited Count:5 Percentile:62.29(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Positron annihilation study of vacancy-type defects in silicon carbide co-implanted with aluminum and carbon ions

Oshima, Takeshi; Uedono, Akira*; Abe, Hiroshi; Chen, Z. Q.*; Ito, Hisayoshi; Yoshikawa, Masahito; Abe, Koji*; Eryu, Osamu*; Nakashima, Kenshiro*

Physica B; Condensed Matter, 308-310, p.652 - 655, 2001/12

 Times Cited Count:6 Percentile:59.56

Co-implantation of Al(2E18/cm3) and C(1E18/cm3) into 6H-SiC and subsequent thermal annealing up to 1650 C werer carried out. Vacancy-type defects in the implanted layer were studied by monoenergetic positron beams. The mean size of vacancy-type defects in as-implanted samples is found to be close to the size of divacancy. Although vacancy clsters near a surface region were created by 1000 C-annealing, clustering is suppressed in a deep region.The mean size of vacancys decrease by annealing above 1000 C, and major vacancy defects annealed out after annealing at 1400 C. No significant difference in defect annealing between only Al- and co-implanted samles was observed.This result suggests that electrical activation of Al is enhanced by the site competition mechanism.

JAEA Reports

Changes in tensile property and X-ray parameter for carbon fiber after high temperature heat-treatment

Saito, Tamotsu; Baba, Shinichi; Eto, Motokuni

JAERI-Research 99-070, p.21 - 0, 2000/01

JAERI-Research-99-070.pdf:1.32MB

no abstracts in English

Journal Articles

SPM characterization of substrate surfaces prepared for carbon-related-film deposition

Narumi, Kazumasa; Yamamoto, Shunya; Naramoto, Hiroshi

Materials Research Society Symposium Proceedings, Vol.587, p.O8.4.1 - O8.4.6, 2000/00

no abstracts in English

Journal Articles

Precipitates of vanadium oxide formed by ion implantation and heat treatment, 2

Narumi, Kazumasa; Yamamoto, Shunya; Naramoto, Hiroshi

JAERI-Review 99-025, TIARA Annual Report 1998, p.155 - 157, 1999/10

no abstracts in English

Journal Articles

Suppressed diffusion of implanted boron in 4H-SiC

M.Laube*; G.Pensl*; Ito, Hisayoshi

Applied Physics Letters, 74(16), p.2292 - 2294, 1999/04

 Times Cited Count:53 Percentile:11.5(Physics, Applied)

no abstracts in English

Journal Articles

Analysis of intergranular cracking for incoloy 908 during a heat treatment

Kikuchi, Kenji; Kato, Takashi; Sugimoto, Makoto; *; Fukaya, Kiyoshi; Kaji, Yoshiyuki

Zairyo, 48(2), p.152 - 158, 1999/02

no abstracts in English

JAEA Reports

None

*; *; *

PNC-TJ6357 98-002, 43 Pages, 1998/02

PNC-TJ6357-98-002.pdf:1.09MB

None

JAEA Reports

None

Sugihara, Yoichiro*; Mukai, Katsuyuki*; Nunomiya, Ichiro*

PNC-TJ6357 97-001, 40 Pages, 1997/03

PNC-TJ6357-97-001.pdf:1.52MB

None

JAEA Reports

Development of HIP bonding procedure and mechanical properties of HIP bonded joints for reduced activation ferritic steel F-82H

*; Kurasawa, Toshimasa; Kuroda, Toshimasa*; Hatano, Toshihisa; Takatsu, Hideyuki

JAERI-Tech 97-013, 141 Pages, 1997/03

JAERI-Tech-97-013.pdf:16.98MB

no abstracts in English

Journal Articles

Neutron scattering studies of the effects of uniaxial stress and ageing on the $$beta$$$$_{1}$$-Cu-Al-Zn alloy

*; *; Morii, Yukio

Journal of the Physical Society of Japan, 65(3), p.778 - 781, 1996/03

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

no abstracts in English

88 (Records 1-20 displayed on this page)