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Journal Articles

Report on the planed session by the NUCE in 2016 AESJ Fall Meeting, "How is the ability of the waste form glass?; Current status of the performance assessment of the waste form glass in the geological disposal system"

Kamei, Gento

Genshiryoku Bakkuendo Kenkyu (CD-ROM), 23(2), p.201 - 202, 2016/12

This paper reports an overview of a planed session, "How is the ability of the waste form glass?; Current status of the performance assessment of the waste form glass in the geological disposal system", held by the NUCE in 2016 AESJ Fall Meeting. Five panelists respectively introduced case studies and/or aspects from the view point of performance assessment, current status in the world including Japan, basic sciences and computation sciences.

Journal Articles

Femtosecond time-resolved solvation process of a solution; Constraints of vibrational degrees of freedom in the supercooled state

Murakami, Hiroshi

Chemical Physics Letters, 417(4-6), p.550 - 554, 2006/01

 Times Cited Count:5 Percentile:82.48(Chemistry, Physical)

no abstracts in English

Journal Articles

Parametric survey on possible impact of partitioning and transmutation of high-level radioactive waste

Oigawa, Hiroyuki; Yokoo, Takeshi*; Nishihara, Kenji; Morita, Yasuji; Ikeda, Takao*; Takaki, Naoyuki*

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 6 Pages, 2005/10

The benefit of implementing Partitioning and Transmutation (P&T) of high-level wastes was parametrically surveyed. The possible reduction of the geological repository area was estimated. By recycling minor actinides (MA), the repository area required for unit spent fuel was reduced significantly in the case of MOX-LWR. This effect was caused by removal of $$^{241}$$Am which is a long-term heat source. By partitioning the fission products, in addition to MA recycling, further 70-80% reduction from the MA-recovery case can be expected for both UO$$_2$$ and MOX. This significant reduction was independent of the cooling time before the partitioning process.

Journal Articles

Transformations in the intermediate-range structure of SiO$$_{2}$$ glass under high pressure and temperature

Inamura, Yasuhiro*; Katayama, Yoshinori; Utsumi, Wataru; Funakoshi, Kenichi*

Physical Review Letters, 93(1), p.015501_1 - 015501_4, 2004/07

 Times Cited Count:102 Percentile:6.77(Physics, Multidisciplinary)

The temperature dependence of the X-ray structure factor for SiO$$_{2}$$ glass was measured at several pressures up to 19.2 GPa. The position of the first sharp diffraction peak moved to a higher momentum transfer as the temperature increased in a specific pressure-temperature range. The intermediate range structure was thermally relaxed to a denser one. Around 7 GPa, the temperature-induced shift saturated and the crystallization temperature drastically increased. These results support the existence of a relatively stable high-pressure form of SiO$$_{2}$$ glass. A sudden transformation was not observed.

Journal Articles

Alteration-phase formation and associated cesium release during alteration of R7T7 waste glass

Inagaki, Yaohiro*; Idemitsu, Kazuya*; Arima, Tatsumi*; Maeda, Toshikatsu; Ogawa, Hiromichi; Itonaga, Fumio

Materials Research Society Symposium Proceedings, Vol.713, p.589 - 596, 2002/00

A large number of studies on HLW glass corrosion have shown that the glass reacts with water to form more stable mineral phases (alteration phases) during the long-term geological disposal. The phase formation is essential to evaluate the radionuclide release from the glass during the long-term disposal. The purpose of this study is to evaluate, experimentally, the mineral phase formation from HLW glass and the associated cesium release. Static corrosion tests were performed on powdered R7T7 glass in alkalline solutions at elevated temperatures to accelerate the reaction, and mineral phases formed were analyzed by XRD. The results showed that analcime (zeolite) is formed as the dominant phase coexisting with SiO$$_{2}$$(am), and beidellite(smectite) or gibbsite coexists dependiting on the conditions. The solution analysis indicated that most of the cesium is retained in the phases of beidellite and analcime by sorption.

Journal Articles

Interlaboratory modeling for performance assessment of engineered barriers in high-level radioactive waste disposal

; *; *; *; *; *; Kimura, Hideo; Munakata, Masahiro

Nippon Genshiryoku Gakkai-Shi, 34(4), p.342 - 364, 1992/04

 Times Cited Count:2 Percentile:71.72(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Pressure-volume behavior and radiation-induced polymerization of acrylic acid-formamide binary system at high pressure

Sasuga, Tsuneo; Takehisa, Masaaki

J.Macromol.Sci.,Part A, A13(6), p.815 - 825, 1979/00

no abstracts in English

Journal Articles

Radiation-induced polymerization of glass-forming systems, 3; Effect of melting point and glass transition temperature on the formation of the glassy phase

Kaetsu, Isao; ; ; *

J.Polym.Sci.,Part A-1, 10(9), p.2661 - 2675, 1972/09

no abstracts in English

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