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Journal Articles

Kinetic study on eutectic melting process between boron carbide and stainless steel in sodium-cooled fast reactor

Kikuchi, Shin; Sakamoto, Kan*; Takai, Toshihide; Yamano, Hidemasa

Nihon Kikai Gakkai 2020-Nendo Nenji Taikai Koen Rombunshu (Internet), 4 Pages, 2020/09

In a postulated severe accidental condition of sodium-cooled fast reactor (SFR), eutectic melting between boron carbide (B $_{4}$ C) as control rod element and stainless steel (SS) as control rod cladding or related structure may occur. Thus, behavior of B $_{4}$ C-SS eutectic melting is one of the phenomena to evaluate the core disruptive accidents in SFR. In order to clarify the kinetic feature of B $_{4}$ C-SS eutectic melting process in the interface, the thinning test for SS crucibles using the pellets of B $_{4}$ C or SS with low B $_{4}$ C concentration were performed to obtain the rate constant with dependence of B $_{4}$ C concentration against SS. It was found that the rate constants of eutectic melting between SS and SS low B $_{4}$ C concentration were smaller than that of B $_{4}$ C-SS in the high temperature range. Besides, the rate constant of eutectic melting between SS and B $_{4}$ C containing SS became small when decreasing the B $_{4}$ C concentration against SS.

Journal Articles

Consideration of radiolytic behavior in diluted and concentrated systems of seawater for computational simulation of hydrogen generation

Nagaishi, Ryuji; Inoue, Masao; Hino, Ryutaro; Ogawa, Toru

Proceedings of 2014 Nuclear Plant Chemistry Conference (NPC 2014) (USB Flash Drive), 9 Pages, 2014/10

Since seawater has been used as a coolant for reactors and spent fuel pools in broken reactor buildings at Fukushima Daiichi NPS accident, radioactive contaminated water emitted following the accident has contained salt content of seawater at high concentrations, different from that at TMI-2 accident. Radiolysis of seawater leading to hydrogen generation and corrosion has been simulated and reported by several groups. However, the proposed radiolysis models cannot be always applied to water radiolysis at the wide range of salt concentrations present in the NPS, mainly because primary yields of radiolysis products of water and radiation-induced reactions are dependent on the salt concentration. In this study, the radiolytic behavior in diluted and concentrated systems of seawater was considered on the basis of results in steady state and pulse radiolysis experiments, in which the above salt effects were demonstrated from the obtained results.

JAEA Reports

Experimental study of pyrite oxidation in compacted sodium bentonite

JNC TN8400 2000-012, 33 Pages, 2000/04

JNC-TN8400-2000-012.pdf:1.04MB

The redox condition of near-field is expected to affect the performance of engineered barrier system. Especially, the oxygen initially existing in the pore space of compacted bentonites strongly affects the redox condition of the near-field. For assessing the influence of the oxygen, the transport parameters of it in the compacted bentonite and consumption process should be known. Therefore, following researches were conducted. In order to understand the diffusion of dissolved oxygen (DO) in compacted bentonite and to predict the effect of DO, the effective diffusion coefficients of DO in compacted sodium bentonite were measured by electrochemistry. As the results, the following relationship between the dry density of compacted sodium bentonite and the effective diffusion coefficient of DO in compacted sodium bentonite was derived: De=1.530.1310 $^{-9}$ exp(-2.150.2410 $^{-3}$ p) where De is the effective diffusion coefficient (m $^{2}$ s $^{-1}$ ) of DO in compacted sodium bentonite and is the dry density (kg m $^{-3}$ ) of compacted sodium bentonite. The oxygen concentration in the bentonite is expected to be controlled by oxidation of pyrite as impurity in the bentonite. In order to investigate the above idea, the rates of pyrite oxidation by DO in compacted sodium bentonite were estimated from the experimental data on pyrite-bentonite systems usig the obtained effective diffusion coefficient of DO. The results show that the averages of the rate constants of pyrite oxidation by DO in the bentonite for dry densities of 0.8, 0.9, 1.0, 1.1 and 1.210 $^{3}$ kgm $^{3}$ were 1.380.3210 $^{-8}$ , 1.100.2410 $^{-8}$ , 1.160.3510 $^{-8}$ , 9.362.2310 $^{-9}$ and 7.481.9210 $^{-9}$ ms $^{-1}$ , respectively. The relationship between the dry density () and the rate constant (k') was expressed as follows: k'=3.941.0610 $^{-8}$ exp(-1.330.2810 $^{-3}$ ) ...

Journal Articles

Kinetics and mechanisms of the reactions of CH and CD with H $_{2}$ S and D $_{2}$ S

Sato, K.*; *; *; *; *; Kurosaki, Yuzuru*; Takayanagi, Toshiyuki

Chemical Physics, 242(1), p.1 - 10, 1999/00

https://doi.org/10.1016/S0301-0104(98)00420-0

Times Cited Count：7 Percentile：22.56(Chemistry, Physical)

no abstracts in English

Journal Articles

Kinetic studies on the N( $^{2}$ D, $^{2}$ P)+CH $_{4}$ and CD $_{4}$ reactions; The Role of nonadiabatic transitions on thermal rate constants

Takayanagi, Toshiyuki; Kurosaki, Yuzuru*; Sato, K.*; *; *; *

Journal of Physical Chemistry A, 103(2), p.250 - 255, 1999/00

https://doi.org/10.1021/jp9833146

Times Cited Count：34 Percentile：71.42(Chemistry, Physical)

no abstracts in English

Journal Articles

Measurements of thermal rate constants for the reactions of N( $^{2}$ D, $^{2}$ P) with C $_{2}$ H $_{4}$ and C $_{2}$ D $_{4}$ between 225 and 292K

Sato, K.*; *; *; *; *; Kurosaki, Yuzuru*; Takayanagi, Toshiyuki

Journal of Physical Chemistry A, 103(43), p.8650 - 8656, 1999/00

https://doi.org/10.1021/jp991742l

Times Cited Count：27 Percentile：64.06(Chemistry, Physical)

no abstracts in English

Journal Articles

Isotope exchange reaction in Li $_{2}$ ZrO $_{3}$ packed bed

Kawamura, Yoshinori; Enoeda, Mikio; Okuno, Kenji

Fusion Engineering and Design, 39-40, p.713 - 721, 1998/00

https://doi.org/10.1016/S0920-3796(97)00189-0

Times Cited Count：8 Percentile：57.28(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Quantum-mechanical tunneling in the H $_{2}$ elimination from 2,3-dimethylbutane cation: (CH $_{3}$ ) $_{2}$ CHCH(CH $_{3}$ ) $_{2+}$ (CH $_{3}$ ) $_{2}$ C=C(CH $_{3}$ ) $_{2+}$ +H $_{2}$ ; An ab initio molecular orbital study

Kurosaki, Yuzuru*; Takayanagi, Toshiyuki; Miyazaki, Tetsuro*

Journal of Molecular Structure; THEOCHEM, 452, p.209 - 218, 1998/00

no abstracts in English

Journal Articles

Measurements of thermal rate constants and theoretical calculations for the N( $^{2}$ D, $^{2}$ P)+C $_{2}$ H $_{2}$ and C $_{2}$ D $_{2}$ reactions

Takayanagi, Toshiyuki; Kurosaki, Yuzuru*; *; *; *; Sato, K.*; *

Journal of Physical Chemistry A, 102(31), p.6251 - 6258, 1998/00

https://doi.org/10.1021/jp9811631

Times Cited Count：42 Percentile：78.25(Chemistry, Physical)

no abstracts in English

Journal Articles

Theoretical calculations of potential energy surface and thermal rate constants for the H(Mu)+F $_{2}$ reaction

Takayanagi, Toshiyuki; Kurosaki, Yuzuru*

Journal of Physical Chemistry A, 101(38), p.7098 - 7104, 1997/00

https://doi.org/10.1021/jp971395k

Times Cited Count：33 Percentile：73.31(Chemistry, Physical)

no abstracts in English

JAEA Reports

Reaction kinetics and reaction heat on thermal decomposition of solvent containing unstable reactive hydrocarbons with nitric acid at Tomsk-7 reprocessing plant

*; *; Koike, Tadao; Miyata, Teijiro

JAERI-Tech 96-056, 59 Pages, 1996/12

JAERI-Tech-96-056.pdf:1.87MB

no abstracts in English

JAEA Reports

Amounts of particulate radionuclides and their reaction constants in radionuclide migration test using undisturbed samples of aerated sandy soil layers

Ogawa, Hiromichi; Takebe, Shinichi;

JAERI-Research 94-002, 12 Pages, 1994/07

JAERI-Research-94-002.pdf:0.61MB

no abstracts in English

Journal Articles

Reactions of technetium(III)-thiourea derivative complexes with pyrimidine derivatives

Hashimoto, Kazuyuki; Kudo, Hiroshi; *; *

Radiochimica Acta, 63, p.167 - 171, 1993/00

https://doi.org/10.1524/ract.1993.63.special-issue.167

no abstracts in English

Journal Articles

Overall reaction rate analysis of ion-exchange resins incineration by fluidized bed

*; Hirata, Masaru; Yahata, Taneaki

Journal of Nuclear Science and Technology, 28(8), p.739 - 747, 1991/08

https://doi.org/10.3327/jnst.28.739

no abstracts in English

JAEA Reports

Thermal Ion-Molecule Reactions in Oxygen-Containing Molecules

JAERI-M 9336, 403 Pages, 1981/02

JAERI-M-9336.pdf:7.11MB

no abstracts in English

Journal Articles

Radiolysis of dyes in aqueous solutions, 5; Bimolecular rate constants for reactions of azo and anthraquinone dyes with (NCS) $_{2}$ $^{-}$

Journal of Nuclear Science and Technology, 16(3), p.221 - 222, 1979/00

https://doi.org/10.3327/jnst.16.221

Times Cited Count：1

no abstracts in English

Journal Articles

Ion-molecule reactions in the binary mixture of ethylene oxide and trioxane, 1; Hydrogen atom and proton transfer reactions

;

Bulletin of the Chemical Society of Japan, 50(8), p.2046 - 2050, 1977/08

https://doi.org/10.1246/bcsj.50.2046

Times Cited Count：8

no abstracts in English

Journal Articles

Solvent effects on the radiation-induced graft polymerization of stylene onto poly(isobutylene oxide)

; Araki, Kunio

Journal of Polymer Science; Polymer Chemistry Edition, 14(11), p.2773 - 2783, 1976/11

no abstracts in English

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Kinetic study on eutectic melting process between boron carbide and stainless steel in sodium-cooled fast reactor

Consideration of radiolytic behavior in diluted and concentrated systems of seawater for computational simulation of hydrogen generation

Experimental study of pyrite oxidation in compacted sodium bentonite

Kinetics and mechanisms of the reactions of CH and CD with H $_{2}$ S and D $_{2}$ S

Kinetic studies on the N( $^{2}$ D, $^{2}$ P)+CH $_{4}$ and CD $_{4}$ reactions; The Role of nonadiabatic transitions on thermal rate constants

Measurements of thermal rate constants for the reactions of N( $^{2}$ D, $^{2}$ P) with C $_{2}$ H $_{4}$ and C $_{2}$ D $_{4}$ between 225 and 292K

Isotope exchange reaction in Li $_{2}$ ZrO $_{3}$ packed bed

Quantum-mechanical tunneling in the H $_{2}$ elimination from 2,3-dimethylbutane cation: (CH $_{3}$ ) $_{2}$ CHCH(CH $_{3}$ ) $_{2+}$ (CH $_{3}$ ) $_{2}$ C=C(CH $_{3}$ ) $_{2+}$ +H $_{2}$ ; An ab initio molecular orbital study

Measurements of thermal rate constants and theoretical calculations for the N( $^{2}$ D, $^{2}$ P)+C $_{2}$ H $_{2}$ and C $_{2}$ D $_{2}$ reactions

Theoretical calculations of potential energy surface and thermal rate constants for the H(Mu)+F $_{2}$ reaction

Reaction kinetics and reaction heat on thermal decomposition of solvent containing unstable reactive hydrocarbons with nitric acid at Tomsk-7 reprocessing plant

Amounts of particulate radionuclides and their reaction constants in radionuclide migration test using undisturbed samples of aerated sandy soil layers

Reactions of technetium(III)-thiourea derivative complexes with pyrimidine derivatives

Overall reaction rate analysis of ion-exchange resins incineration by fluidized bed

Thermal Ion-Molecule Reactions in Oxygen-Containing Molecules

Radiolysis of dyes in aqueous solutions, 5; Bimolecular rate constants for reactions of azo and anthraquinone dyes with (NCS) $_{2}$ $^{-}$

Ion-molecule reactions in the binary mixture of ethylene oxide and trioxane, 1; Hydrogen atom and proton transfer reactions

Solvent effects on the radiation-induced graft polymerization of stylene onto poly(isobutylene oxide)