JOPSS - Search Results

Search Results: Records 1-5 displayed on this page of 5

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Journal Articles

Study on contribution of surface diffusion on mass transfer of actinides and fision products in granite

Yamaguchi, Tetsuji

Kyouto Daigaku Daigakuin Kougaku Kenkyuka Hakase Gakui Ronbun, 136 Pages, 2001/01

no abstracts in English

JAEA Reports

The Acceleration factor and inhibitor of the generation and growth of the cavity at high temperature; Computer simulation on growth of cavity

; Ueno, Fumiyoshi

JNC TN9400 2000-017, 10 Pages, 2000/03

JNC-TN9400-2000-017.pdf:0.58MB

lt is difficult to get hold the behave of growth of cavity which nucleates in grain boudaly in experimental observation. lt is considerd that numerical simulation is effective for the grasp of behave of cavity growth, because it is able to grasp the microscopic behavior of internal material whici is hardly observation. We examine the factor that the diffusive ratio and the stress etc., affected growth of cavity on grain boundary with numerical simulation using diffusive equation. As the result, a following knowledge was obtained. (1)With dominant of grain boundary diffusion, the shape of cavity transitions from quasi-equilibrium to crac-like. ln other hand, with dominant of surface diffusion, cavity grows up with initial shape. (2)With dominate of grain boundary diffusion, it accelerates the growth rate of the cavity near the tip by grain boundaly diffusion induced stressing perpendicular to gain boundary (3)With dominant of surface diffusion, the distribution of chemical potential is uniformity on cavity surface. ln other hand, with dominant of grain boundary diffusion compare to that of surface diffusion, the gradient of chemical potential is increased at the tip of cavity.

JAEA Reports

Acquisitions of effective diffusion coefficients (De) for Ni(II), Am(III), Sm(III) and Se(IV) in bentonite by through-diffusion method

Sato, Haruo

JNC TN8400 99-062, 16 Pages, 1999/10

JNC-TN8400-99-062.pdf:0.81MB

Effective diffusion coefficients (De) for Ni $^{2+}$ , Sm $^{3+}$ , Am $^{3+}$ and SeO $_{3}^{2-}$ were measured as a function of the ionic charge of diffusion species to quantitatively evaluate the effect of ionic charge in compacted bentonite. The De measurements for Ni $^{2+}$ and Sm $^{3+}$ were carried out for a bentonite dry density of 1.8 Mgm $^{-3}$ with a simulated porewater condition of pH56 by through-diffusion method. The De values for SeO $_{3}^{2-}$ were measured for a bentonite dry density of 1.8 Mgm $^{-3}$ with a simulated porewater condition of pH11. The De measurements for Am $^{3+}$ were carried out for the dry densities of 0.8, 1.4 and l.8 Mgm $^{-3}$ with a porewater condition of pH2 in order to check cation exclusion. Sodium bentonite, Kunigel-V1 was used for those measurements. For the measurements of Am, H-typed Kunigel-V1 which interlayer ion (Na $^{+}$ ) was exchanged with H $^{+}$ was used, because the experiments are carried out for a low pH range. The order of obtained De values was Sm $^{3+}$ Ni $^{2+}$ Am $^{3+}$ SeO $_{3}^{2-}$ . These De values were compared to those reported to date. Consequently, the order of De values was Cs $^{+}$ Sm $^{3+}$ HTO Ni $^{2+}$ anions (I $^{-}$ , Cl $^{-}$ , CO $_{3}^{2-}$ , SeO $_{3}^{2-}$ TcO $_{4}^{-}$ , NpO $_{2}$ CO $_{3}^{-}$ , UO $_{2}$ (CO $_{3}$ ) $_{3}^{4-}$ ), showing a tendency of cations HTO anions. Only the De values of Am $^{3+}$ were approximately the same degree as those of anions. The reason that the De of Ni $^{2+}$ was lower than that of HTO may be because the free water diffusion coefficient (Do) of Ni $^{2+}$ is about 1/3 of that of HTO. The cause that the De of Am $^{3+}$ was approximately the same degee as those of anions may be because the Do of Am $^{3+}$ is about 1/3 of that of HTO and that Am $^{3+}$ was electrostatically repulsed from the surface of bentonite by cation exclusion. The formation factors (FF), calculated normalizing Do, were in the ...