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Journal Articles

Occupation sites and valence states of Co dopants in (La, Co)-codoped M-type Sr ferrite; $$^{57}$$Fe and $$^{59}$$Co nuclear magnetic resonance studies

Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ueda, Hiroaki*; Tanioku, Yasuaki*; Michioka, Chishiro*; Yoshimura, Kazuyoshi*; Takao, Kenta*; Shimoda, Aiko*; et al.

Physical Review B, 98(6), p.064403_1 - 064403_10, 2018/08

 Times Cited Count:8 Percentile:48.47(Materials Science, Multidisciplinary)

To specify preferential occupation sites of Co substituents and to clarify charge and spin states of Co ions in (La, Co)-cosubstituted hexagonal magnetoplumbite-type (M-type) Sr ferrite, $$^{57}$$Fe and $$^{59}$$Co nuclear magnetic resonance (NMR) spectra are measured under zero and external magnetic fields using powdered and single crystalline specimens. To a considerable degree, the charge compensation between La$$^{3+}$$ and Co$$^{2+}$$ works in the equal (La, Co)-codoped case, where more than half of the Co ions are considered to be present in the minority spin $$4f_1$$ sites at the center of the oxygen tetrahedra, with the $$S$$ = 3/2 state carrying a small orbital moment owing to spin-orbit interaction. The remaining small number of high-spin Co$$^{2+}$$ ($$S$$ = 3/2, $$L$$ = 1) ions with unquenched orbital moments would be distributed to the other octahedral $$12k$$, $$2a$$, and $$4f_2$$ sites.

Journal Articles

Activities on public awareness of a prototype fast breeder reactor, Monju, and casebook of potential troubles

Yanagisawa, Tsutomu; Tabata, Hiroaki; Mori, Masaomi

E-Journal of Advanced Maintenance (Internet), 2(1), 7 Pages, 2010/05

Monju, the Japanese prototype of fast breeder reactor, has engaged in various activities to restore the public trust since the sodium leak accident occurred in 1995. Among the activities is the publication of a risk communication booklet "Response to the possible accident and trouble in Monju" which is compiled according to the operational progress of "Monju". This booklet is intended for promoting the public understanding toward the restart. The supplement of the booklet illustrates the outline and characteristics of "Monju", the recent troubles at not only "Monju", but also home and abroad, and the assumed troubles during the core confirmation test which is implemented when the system start-up test is commenced. These efforts for the restart are also explained.

Journal Articles

Activities in Monju to improve public relations and a risk communication booklet

Yanagisawa, Tsutomu; Tabata, Hiroaki; Mori, Masaomi

Hozengaku, 8(3), p.17 - 22, 2009/10

Monju, the Japanese prototype of fast breeder reactor, has engaged in various activities to restore the public trust since the sodium leak accident occurred in 1995. Among the activities is the publication of a risk communication booklet Response to the Possible Accident and Trouble in Monju which is compiled according to the operational progress of Monju. This booklet is intended for promoting the public understanding toward the restart. The supplement of the booklet illustrates the outline and characteristics of Monju, the recent troubles at not only Monju, but also home and abroad, and the assumed troubles during the Core Confirmation Test which is implemented when the System Start-Up Test is commenced. These efforts for the restart are also explained.

Journal Articles

A New optical instrumentation system for advanced light water reactor

Kakuta, Tsunemi; Yamagishi, Hideshi; Tabata, Hiroaki*; Urakami, Masao*

Dai-7-Kai Doryoku Enerugi Gijutsu Shimpojiumu Koen Rombunshu (00-11), p.254 - 257, 2000/11

no abstracts in English

Journal Articles

Experimental investigation of thermal-hydraulic performance of PCCS with horizontal tube heat exchangers; Single U-tube test

Nakamura, Hideo; Anoda, Yoshinari; Tabata, Hiroaki*; Obata, Hiroyuki*; Arai, Kenji*; Kurita, Tomohisa*

JAERI-Conf 2000-015, p.177 - 184, 2000/11

no abstracts in English

JAEA Reports

Investigation of a neutron measuring system with a position-sensitive-fission-counter

Yamagishi, Hideshi; Ikeda, Yujiro; Ito, Hiroshi; Kakuta, Tsunemi; Nakakawa, Masayuki; Iwamura, Takamichi; Tabata, Hiroaki*; Urakami, Masao*

JAERI-Tech 2000-037, p.12 - 0, 2000/03

JAERI-Tech-2000-037.pdf:1.12MB

no abstracts in English

Journal Articles

Single U-tube Testing and RELAP5 code analysis of PCCS with horizontal heat exchanger

Nakamura, Hideo; Kondo, Masaya; Asaka, Hideaki; Anoda, Yoshinari; Tabata, Hiroaki*; Obata, Hiroyuki*

Proceedings of 2nd Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-2), p.336 - 343, 2000/00

no abstracts in English

Oral presentation

Handbook for supposed trouble cases and restore actions in Monju

Yamada, Fumiaki; Tabata, Hiroaki; Miyakawa, Akira; Okada, Mamoru; Okabe, Ayao; Misawa, Naoto*

no journal, , 

no abstracts in English

Oral presentation

Equipment integrity confirmation of fast breeder prototype reactor MONJU, 1; Outline of modification work and result of its functional test

Tabata, Hiroaki; Maeda, Hiroshi; Ibaki, Shoji; Tanabe, Hiromi

no journal, , 

no abstracts in English

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