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Takeuchi, Tomoaki; Otsuka, Noriaki; Watanabe, Takashi*; Tanaka, Shigeo*; Ozawa, Osamu*; Komanome, Hirohisa*; Ueno, Shunji*; Tsuchiya, Kunihiko
Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 3 Pages, 2018/11
no abstracts in English
=28 and 
=50; Spectroscopy of 
ZnShand, C. M.*; Podoly
k, Zs.*; G
rska, M.*; Doornenbal, P.*; Obertelli, A.*; Nowacki, F.*; Otsuka, T.*; Sieja, K.*; Tostevin, J. A.*; Tsunoda, T.*; et al.
Physics Letters B, 773, p.492 - 497, 2017/10
Times Cited Count：25 Percentile：87.8(Astronomy & Astrophysics)
isobars from the 
island of inversionMorales, A. I.*; Benzoni, G.*; Watanabe, H.*; Tsunoda, Yusuke*; Otsuka, T.*; Nishimura, Shunji*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; et al.
Physics Letters B, 765, p.328 - 333, 2017/02
Times Cited Count：33 Percentile：92.56(Astronomy & Astrophysics)Takeuchi, Tomoaki; Otsuka, Noriaki; Shibagaki, Taro*; Komanome, Hirohisa*; Ueno, Shunji*; Tsuchiya, Kunihiko
Nihon Hozen Gakkai Dai-13-Kai Gakujutsu Koenkai Yoshishu, p.379 - 386, 2016/07
no abstracts in English
Takeuchi, Tomoaki; Otsuka, Noriaki; Tsuchiya, Kunihiko; Tanaka, Shigeo*; Ozawa, Osamu*; Komanome, Hirohisa*; Watanabe, Takashi*; Ueno, Shunji*
Nihon Hozen Gakkai Dai-13-Kai Gakujutsu Koenkai Yoshishu, p.391 - 394, 2016/07
no abstracts in English
Takeuchi, Tomoaki; Otsuka, Noriaki; Watanabe, Takashi*; Kamiyanagi, Tomohiro*; Komanome, Hirohisa*; Ueno, Shunji*; Tsuchiya, Kunihiko
Proceedings of Decommissioning and Remote Systems 2016 (D&RS 2016) (CD-ROM), p.263 - 264, 2016/07
In response to the lesson of the accident at the Fukushima Dai-ichi Nuclear Power Plant, we started a development of a radiation resistant monitoring camera system. In this study, improvement of radiation resistance of the imaging sensor was addressed as the main target. Three different types of CMOS image sensors with field plate structure and three transistors (3TPD), photogate structure and three (3TPG) or four transistors (4TPG) were designed and fabricated. The sensors were irradiated up to 70 kGy at the 
Co 
-ray irradiation facility at Takasaki Advanced Radiation Research Institute in Japan Atomic Energy Agency. After irradiation, the dark current of the 4TPG rapidly increased and excessed that of the 3T types at least by 50 kGy. The large increase of the dark current of the 4TPG resulted in almost no sensitivity at least by 50 kGy. On the other hand, the sensitivities of the 3T types remained usable values and 3TPG had larger sensitivity than 3TPD after 50 kGy. As the results, the 3TPG sensor was revealed to be the most advantageous one in terms of dark current and sensitivity among the fabricated three sensors.
Sn explored with the long-lived isomer in 
PdWatanabe, H.*; Lorusso, G.*; Nishimura, Shunji*; Otsuka, T.*; Ogawa, K.*; Xu, Z. Y.*; Sumikama, Toshiyuki*; S
derstrm, P.-A.*; Doornenbal, P.*; Li, Z.*; et al.
Physical Review Letters, 113(4), p.042502_1 - 042502_6, 2014/07
Times Cited Count：25 Percentile：76.81(Physics, Multidisciplinary)Takeuchi, Tomoaki; Ueno, Shunji; Komanome, Hirohisa*; Otsuka, Noriaki; Shibata, Hiroshi; Kimura, Nobuaki; Matsui, Yoshinori; Tsuchiya, Kunihiko; Araki, Masanori
Proceedings of 6th International Symposium on Material Testing Reactors (ISMTR-6) (Internet), 7 Pages, 2013/10
During the station blackout situation at the Fukushima Dai-ichi (1F) Nuclear Power Plant, conventional in-pile instrumentation systems did not work sufficiently, resulting in the progress of the severe accident. In June 2011, the Japanese government referred to "Enhancement of instrumentation to identify the status of the reactors and PCVs" as a lesson of the accident at the 1F NPP, in the report of Japanese government to the IAEA ministerial conference in accordance with such situation, we started from 2012 a research and development which corresponds to the provisions so as to monitor the NPPs situations during a severe accident. In this research and development, we have been building of technical bases of a radiation-resistant high-definition and high-sensitivity monitoring camera, a wireless transmission system, and radiation- and heat-resistant signal line. The objective and latest progress situations of the R&D including the results of the characteristic experiments will be introduced in this symposium.
Kaito, Takeji; Otsuka, Satoshi; Inoue, Masaki; Asayama, Tai; Uwaba, Tomoyuki; Mizuta, Shunji; Ukai, Shigeharu*; Furukawa, Tomohiro; Ito, Chikara; Kagota, Eiichi; et al.
Journal of Nuclear Materials, 386-388, p.294 - 298, 2009/04
Times Cited Count：32 Percentile：88.45(Materials Science, Multidisciplinary)In order to examine irradiation effect on creep rupture strength of Oxide Dispersion Strengthened (ODS) steel claddings, the in-pile creep rupture test was conducted using Material Testing Rig with Temperature Control (MARICO)-2 in the experimental fast reactor JOYO. Fourteen creep rupture events were successfully detected by the temperature change in each capsule and the -ray spectrometry of the cover gas. Time to creep ruptures of six ODS steel specimens were identified by means of Laser Resonance Ionization Mass Spectrometry (RIMS), and no irradiation effect on creep rupture strength was confirmed within the irradiation condition in the MARICO-2 test.
Kaito, Takeji; Mizuta, Shunji; Uwaba, Tomoyuki; Otsuka, Satoshi; Ukai, Shigeharu
JNC TN9400 2005-015, 126 Pages, 2005/02
JNC-TN9400-2005-015.pdf:3.43MB
Oxide Dispersion Strengthened (ODS) ferritic steel has excellent swelling resistance and improved high-temperature strength, which are important properties for fast reactor fuel cladding tube. In feasibility study (FS) which is advanced by Japan Nuclear Cycle Development Institute (JNC), ODS ferritic steel is noticed as a prospective candidate material for commercialized fast reactor (FR) fuel cladding tube. JNC has developed a microstructure control procedure to disperse nano-sized oxide particles in equiaxed crystal grain and succeeded in producing high performance ODS ferritic steel tube, which has adequate mechanical properties. For the purpose of getting irradiation data base and evaluating applicability of ODS ferritic steel, fuel pin irradiation test of ODS ferritic steel cladding in FR such as JOYO is in the planning stage.This report describes a summary of the tentative materials strength standard of ODS ferritic steels for designing of FR fuel pin.
Otsuka, Satoshi; Uwaba, Tomoyuki; ; Mizuta, Shunji
JNC TN9400 2001-038, 40 Pages, 2001/03
14Cr-25Ni advanced austenitic steels (14Cr-25Ni steel) was developed in order to improve the swelling resistance of modified 15Cr-20Ni base austenitic steels(PNC1520). This steel is planned to be utilized as back-up material for Monju advanced core component. Seven types of cladding tubes with different amounts of alloying elements of Ti, Nb, V and P had been fabricated and the out-of-pile testing of these cladding tubes has been conducted. Among out of piles properties, tensile property and creep property of 14Cr-25Ni steels were evaluated in this study. The results can be summarized as follows. (1)Tensile properties (0.2% yield stress, ultimate tensile strength, uniform elongation, ultimate elongation) of 14Cr-25Ni steels were almost equivalent to those of PNC316 steel and PNC1520 steel in the temperature range from room temp. to 900
C. (2)The creep strength of 14Cr-25Ni steels was between PNC316 and PNC1520. It was shown that the long term creep strength at 750C was remarkably improved by the Ti, Nb and V addition. (3)It is suspected that the improvement of creep strength of V-added-steel would be caused by stabilization of dislocation microstructure due to finely distributed carbo-nitride [Ti, Nb, V(C, N)] precipitates.
Tsuji, Shunji; Neyatani, Yuzuru; Hosogane, Nobuyuki; Matsukawa, Makoto; ; Totsuka, Toshiyuki; Kimura, Toyoaki
JAERI-M 91-196, 36 Pages, 1991/11
no abstracts in English
Ishidera, Takamitsu; Kurosawa, Seiichi*; Otsuka, Shunji*; Hayashi, Masanori*; Uchikoshi, Keiji*; Suzuki, Yasuyuki*
no journal, ,
no abstracts in English
Ishidera, Takamitsu; Kurosawa, Seiichi*; Otsuka, Shunji*; Uchikoshi, Keiji*; Kamei, Gento; Alexander, W. R.*
no journal, ,
no abstracts in English
irradiation effects of image sensor for radiation-resistant cameraTakeuchi, Tomoaki; Otsuka, Noriaki; Kamiyanagi, Tomohiro*; Watanabe, Takashi*; Komanome, Hirohisa*; Ueno, Shunji*; Tsuchiya, Kunihiko
no journal, ,
no abstracts in English
Takeuchi, Tomoaki; Tanaka, Shigeo*; Watanabe, Takashi*; Otsuka, Noriaki; Ozawa, Osamu*; Komanome, Hirohisa*; Ueno, Shunji*; Tsuchiya, Kunihiko
no journal, ,
no abstracts in English
Tanaka, Shigeo*; Ozawa, Osamu*; Watanabe, Takashi*; Takeuchi, Tomoaki; Otsuka, Noriaki; Ueno, Shunji*; Komanome, Hirohisa*; Tsuchiya, Kunihiko
no journal, ,
no abstracts in English
