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Journal Articles

Irradiation behavior of rock-like oxide fuels

Yamashita, Toshiyuki; Kuramoto, Kenichi; Shirasu, Noriko; Nakano, Yoshihiro; Akie, Hiroshi; Nagashima, Hisao; Kimura, Yasuhiko; Omichi, Toshihiko*

Journal of Nuclear Materials, 320(1-2), p.126 - 132, 2003/07

 Times Cited Count:10 Percentile:58.26(Materials Science, Multidisciplinary)

Two irradiation tests on the rock-like oxide (ROX) fuels, small disk-shape fuel targets and pellet-type fuels, were performed in order to clarify in-pile irradiation stabilities. Swelling, fractional fission gas release (FGR) and phase change were examined by puncture test, profilometry and ceramography. YSZ single-phase fuel showed an excellent irradiation behavior, ie. low fission gas release (less than 3%), negligible swelling and no appreciable restructuring. The particle dispersed fuels showed lower swelling and higher fission gas release than those of mechanically blended fuels. Spinel decomposition and subsequence restructuring in the spinel matrix fuels was observed for the first time in the present investigation. It would be possible to reduce the FGR of the spinel matrix fuels, if the maximum fuels temperature is limited below 1700 K where neither spinel decomposition nor restructuring was observed. Damaged area of spinel matrix due to fission fragment irradiation seemed to be confined to thin layers around the surface of YSZ particles.

Journal Articles

Empirical evaluation of the thermodynamic and magnetic properties from the atomic distances of NaCl-type actinide compounds

Omichi, Toshihiko*; Arai, Yasuo

Journal of Nuclear Science and Technology, 39(Suppl.3), p.156 - 159, 2002/11

no abstracts in English

Journal Articles

Depth-dependent and surface damages in MgAl$$_{2}$$O$$_{4}$$ and MgO irradiated with energetic iodine ions

Aruga, Takeo; Katano, Yoshio*; Omichi, Toshihiko*; Okayasu, Satoru; Kazumata, Yukio*; Jitsukawa, Shiro

Nuclear Instruments and Methods in Physics Research B, 197(1-2), p.94 - 100, 2002/11

 Times Cited Count:5 Percentile:35.97(Instruments & Instrumentation)

no abstracts in English

Journal Articles

The Interpretation of surface damages in Al$$_{2}$$O$$_{3}$$, MgAl$$_{2}$$O$$_{4}$$ and MgO irradiated with energetic iodine ions

Aruga, Takeo; Katano, Yoshio*; Omichi, Toshihiko*; Jitsukawa, Shiro

Surface & Coatings Technology, 158-159, p.444 - 448, 2002/09

no abstracts in English

Journal Articles

Mass-spectrometric determination of oxygen potential of hypostoichiometric urania-yttria solid solution

Nakajima, Kunihisa; Omichi, Toshihiko*; Arai, Yasuo

Journal of Nuclear Materials, 304(2-3), p.176 - 181, 2002/08

 Times Cited Count:3 Percentile:24.34(Materials Science, Multidisciplinary)

The oxygen potentials of two type urania-yttria solid solutions, one is the solid solution expressed as nearly U$$_{1-y}$$Y$$_{y}$$O$$_{2-y/2}$$ and the other is nearly stoichiometric solid solution, are investigated by use of a mass spectrometer combined with a Knudsen cell. The oxygen potentials for the nearly stoichiometric specimens are much higher than those for pure urania with similar stoichiometry. On the other hand, the oxygen potentials for fully reduced specimens almost agree with those for pure urania having the same oxygen deficiencis.

Journal Articles

Rock-like oxide fuels and their burning in LWRs

Yamashita, Toshiyuki; Kuramoto, Kenichi; Akie, Hiroshi; Nakano, Yoshihiro; Shirasu, Noriko; Nakamura, Takehiko; Kusagaya, Kazuyuki*; Omichi, Toshihiko*

Journal of Nuclear Science and Technology, 39(8), p.865 - 871, 2002/08

 Times Cited Count:25 Percentile:83.26(Nuclear Science & Technology)

Research on the plutonium rock-like oxide (ROX) fuels and their once-through burning in light water reactors has been performed to establish an option for utilizing and disposing effectively the excess plutonium. The ROX fuel is a sort of the inert matrix fuels and consists of mineral-like compounds such as yttria stabilized zirconia, spinel and corundum. A particle-dispersed fuel was devised to reduce damage by heavy fission fragments. Some preliminary results on swelling, fractional gas release and microstructure change for five ROX fuels were obtained from the irradiation test and successive post-irradiation examinations. Inherent disadvantages of the Pu-ROX fuel cores could be improved by adding 238U or 232Th as resonant materials, and all improved cores showed a nearly the same characteristics as the conventional UO2 core during transient conditions. The threshold enthalpy of the ROX fuel rod failure was found to be comparable to the fresh UO2 rod by pulse-irradiation tests simulating reactivity initiated accident conditions.

Journal Articles

Evaluation on chemical state of irradiated rock-like oxide fuels by nuclear and chemical modeling

Nitani, Noriko; Kuramoto, Kenichi; Yamashita, Toshiyuki; Omichi, Toshihiko*

Progress in Nuclear Energy, 38(3-4), p.435 - 438, 2001/02

 Times Cited Count:1 Percentile:12.49(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Rock-like oxide fuels for burning excess plutonium in LWRs

Yamashita, Toshiyuki; Kuramoto, Kenichi; Akie, Hiroshi; Nakano, Yoshihiro; Nitani, Noriko; Nakamura, Takehiko; Kusagaya, Kazuyuki*; Omichi, Toshihiko*

Proceedings of Workshop on Advanced Reactors with Innovative Fuels (ARWIF 2001) (CD-ROM), 10 Pages, 2001/00

no abstracts in English

Journal Articles

Amorphization behaviors in polycrystalline alumina irradiated with energetic iodine ions

Aruga, Takeo; Katano, Yoshio; Omichi, Toshihiko; Okayasu, Satoru; Kazumata, Yukio

Nuclear Instruments and Methods in Physics Research B, 166-167, p.913 - 919, 2000/05

 Times Cited Count:29 Percentile:86.35(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

A Study on density, porosity and grain size of unirradiated ROX fules and simulated ROX fuels

Yanagisawa, Kazuaki; Omichi, Toshihiko*; Shirasu, Noriko; Yamashita, Toshiyuki; ; Onozawa, Atsushi; ; Kanazawa, Hiroyuki; Kanaitsuka, Fumio; Amano, Hidetoshi

JAERI-Tech 99-044, 46 Pages, 1999/05

JAERI-Tech-99-044.pdf:4.66MB

no abstracts in English

JAEA Reports

A Study on density, melting point, thermal expansion, creep, thermal diffusivity and thermal conductivity of the simulated rock-like oxide (ROX) fuels

Yanagisawa, Kazuaki; Omichi, Toshihiko*; Shirasu, Noriko; Muromura, Tadasumi; *

JAERI-Tech 99-032, 65 Pages, 1999/03

JAERI-Tech-99-032.pdf:3.23MB

no abstracts in English

Journal Articles

Out-of-pile tests of simulated rock-like oxide (ROX) fuels

Yanagisawa, Kazuaki; Omichi, Toshihiko*; Muromura, Tadasumi; *; Shirasu, Noriko

Journal of Nuclear Science and Technology, 36(2), p.160 - 168, 1999/02

 Times Cited Count:4 Percentile:36.04(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Energy transfer and thermal conductivity through inert matrix and nuclear fuel analogous materials

C.Degueldre*; Takano, Masahide; Omichi, Toshihiko; Fukuda, Kosaku; P.Heimgartner*; T.Graber*

JAERI-Research 97-087, 19 Pages, 1997/11

JAERI-Research-97-087.pdf:0.87MB

no abstracts in English

JAEA Reports

Fission gas release from rock-like fuels, PuO$$_{2}$$-ZrO$$_{2}$$(Y){or ThO$$_{2}$$}-Al$$_{2}$$O$$_{3}$$-MgO at burn-up of 20 MWd/kg

Yanagisawa, Kazuaki; Omichi, Toshihiko; Kanazawa, Hiroyuki; Amano, Hidetoshi; Yamahara, Takeshi

JAERI-Research 97-085, 31 Pages, 1997/11

JAERI-Research-97-085.pdf:2.38MB

no abstracts in English

JAEA Reports

Thermal expantion and thermal conductivity of rock-like fuel

*; Kobayashi, Shinichi*; Shirasu, Noriko; Yamashita, Toshiyuki; Omichi, Toshihiko; Muromura, Tadasumi

JAERI-Research 97-083, 21 Pages, 1997/11

JAERI-Research-97-083.pdf:1.23MB

no abstracts in English

Journal Articles

A New ceramic fuel for almost complete burning of plutonium in light water reactor

Muromura, Tadasumi; Yamashita, Toshiyuki; Omichi, Toshihiko; Akie, Hiroshi; Takano, Hideki

Proc. of 14th Int. Japan-Korea Seminar on Ceramics, p.127 - 131, 1997/00

no abstracts in English

JAEA Reports

Assessment for swelling of rock-like fuel by irradiation

Omichi, Toshihiko

JAERI-Review 96-008, 13 Pages, 1996/07

JAERI-Review-96-008.pdf:0.92MB

no abstracts in English

JAEA Reports

Synthesis of complex plutonium oxides with alkaline-earth metals

; Nakajima, Kunihisa; Iwai, Takashi; Omichi, Toshihiko; *

JAERI-Research 95-027, 19 Pages, 1995/03

JAERI-Research-95-027.pdf:0.89MB

no abstracts in English

Journal Articles

Consideration of the thermodynamic and magnetic properties of NaCl-type uranium, neptunium, and plutonium compounds

Arai, Yasuo; Omichi, Toshihiko

Journal of Solid State Chemistry, 115(1), p.66 - 70, 1995/02

 Times Cited Count:1 Percentile:6.95(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Vaporization behaviour of (Pu,Am)N

Ogawa, Toru; Omichi, Toshihiko; Maeda, Atsushi; Arai, Yasuo;

Journal of Alloys and Compounds, 224, p.55 - 59, 1995/00

 Times Cited Count:23 Percentile:79.68(Chemistry, Physical)

no abstracts in English

45 (Records 1-20 displayed on this page)