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JAEA Reports

lnvestigation for corrosion behavior of ferritic core materials in CO $_{2}$ gas cooled reactor

; ; Mizuta, Shunji

JNC TN9400 2000-040, 41 Pages, 2000/03

JNC-TN9400-2000-040.pdf:0.85MB

The corrosion behavior of ferritic stainless steels applied to core components under C0 $_{2}$ gas environment was investigated in order to be helpful to fuel design in C0 $_{2}$ gas cooled reactor as the feasibility study for fast breeder reactor. The dependence of the corrosion behavior, before a breakaway occurs, on C0 $_{2}$ gas temperature, Si and Cr contents of ferritic steels was determined quantitatively. The following correlations to calculate the metal loss thickness was established. X = 4.4w w = √(kt) k = exp( - 5.45[Si]) exp( - 1.09[Cr]) exp( - 11253/T) = 1.65 10 $^{8}$ 4.40 10 $^{9}$ X : metal loss thickness[ml, w : corrosion weight gain [mg/cm $^{2}$ ] k : parabola constant [(mg/cm $^{2}$ ) $^{2}$ /hr], t : time [hr], : constant [Si] : Si content[wt.%], [Cr] : Cr content [wt.%], T : temperature [K]

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 ...