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Journal Articles

Changes of the surface-to-volume ratio and diffusion coefficient of fission gas in fuel pellets during irradiation

Amaya, Masaki; Grismanovs, V.*; Tverberg, T.*

Journal of Nuclear Materials, 402(2-3), p.108 - 115, 2010/07

https://doi.org/10.1016/j.jnucmat.2010.05.004
 Times Cited Count：3 Percentile：24.08(Materials Science, Multidisciplinary)

Short-lived fission gas release from fuel pellets during irradiation was investigated based on the experimental results of the gas-flow rigs irradiated in the Halden Reactor. The release-to-birth rates of short-lived fission gas were measured, and surface-to-volume (S/V) ratios of fuel pellets and diffusion coefficients of short-lived fission gas release were evaluated. The increase of (S/V) ratio agreed well with the point where the fuel temperature exceeded the threshold of 1% fission gas release. This indicates that the interlinkage of fission gas bubbles occurred there. The evaluated diffusion coefficients scattered in the range between 10$$^{-23}$$ and 10$$^{-17}$$ m$$^{2}$$/s, and the effects of fuel type were not clearly observed. In addition, it is likely that the restructuring effect of fuel pellet on the diffusion coefficients of short-lived fission gas at least in the fuel pellet matrix is negligible in high burnup region where the rim structure forms in the fuel pellet.

Journal Articles

High energy heavy ion induced structural disorder in Li$$_{2}$$TiO$$_{3}$$

Nakazawa, Tetsuya; Naito, Akira*; Aruga, Takeo; Grismanovs, V.*; Chimi, Yasuhiro; Iwase, Akihiro*; Jitsukawa, Shiro

Journal of Nuclear Materials, 367-370(2), p.1398 - 1403, 2007/08

https://doi.org/10.1016/j.jnucmat.2007.04.003
 Times Cited Count：43 Percentile：92.87(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Disordering in Li$$_{2}$$TiO$$_{3}$$ irradiated with high energy ions

Nakazawa, Tetsuya; Grismanovs, V.*; Yamaki, Daiju; Katano, Yoshio*; Aruga, Takeo

Nuclear Instruments and Methods in Physics Research B, 206, p.166 - 170, 2003/05

https://doi.org/10.1016/S0168-583X(03)00712-2
 Times Cited Count：33 Percentile：88.19(Instruments & Instrumentation)

Li$$_{2}$$TiO$$_{3}$$ samples with high energy oxygen ions were examined by the use of Raman spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The Raman spectra of the irradiated samples do not show any evidence of destruction of Li$$_{2}$$TiO$$_{3}$$ structure. On the other hand, the Bragg peak intensity of XRD is decreased with the increasing the ion fluence. Especially, the intensity of (002) supercell peak is drastically reduced after the irradiation to 1.2E+19 ions/m$$^{2}$$. This result implies that partial site mixing between Li and Ti atoms is induced by the irradiation. The transition to such a disordering is observed also by SEM examination; the grain structure at surface layer is vanished after the irradiation.

Journal Articles

Ab initio study on isotope exchange reactions of H$$_{2}$$ with surface hydroxyl groups in lithium silicates

Nakazawa, Tetsuya; Yokoyama, Keiichi; Grismanovs, V.*; Katano, Yoshio*; Jitsukawa, Shiro

Journal of Nuclear Materials, 307-311(Part2), p.1436 - 1440, 2002/12

https://doi.org/10.1016/S0022-3115(02)01283-7
 Times Cited Count：1 Percentile：10.15(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Ab initio study on the mechanism of hydrogen release from the silicate surface in the presence of water molecule

Nakazawa, Tetsuya; Yokoyama, Keiichi; Grismanovs, V.*; Katano, Yoshio*; Jitsukawa, Shiro

Journal of Nuclear Materials, 302(2-3), p.165 - 174, 2002/04

https://doi.org/10.1016/S0022-3115(02)00779-1
 Times Cited Count：3 Percentile：23.41(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

An ab initio study on formation and desorption reactions of H$$_{2}$$O molecules from surface hydroxyl groups in silicates

Nakazawa, Tetsuya; Yokoyama, Keiichi; Grismanovs, V.*; Katano, Yoshio*

Journal of Nuclear Materials, 297(1), p.69 - 76, 2001/07

https://doi.org/10.1016/S0022-3115(01)00584-0
 Times Cited Count：9 Percentile：56.08(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Study of ion-induced damage in Li$$_{2}$$TiO$$_{3}$$ ceramics

Nakazawa, Tetsuya; Grismanovs, V.*; Yamaki, Daiju; Katano, Yoshio*; Aruga, Takeo; Iwamoto, Akira

Proceedings of 2000 International Conference on Ion Implantation Technology (IIT 2000), p.753 - 756, 2000/00

no abstracts in English

Oral presentation

Ab initio calculations on interaction of H$$_{2}$$ with lithium silicate surface

Nakazawa, Tetsuya; Yokoyama, Keiichi; Grismanovs, V.*; Jitsukawa, Shiro; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

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