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Suzuki, Satoru; Sato, Haruo; Ishidera, Takamitsu; Fujii, Naoki*; Kawamura, Katsuyuki*
JNC TN8400 2001-031, 44 Pages, 2002/05
In order to quantify effect of temperature on diffusivity of deuterated water (HDO) in compacted sodium-bentonite, through-diffusion experiments were conducted at elevated tempemture from 298 to 333 K. Kunipia F (Na-montmorillonite content 98 wt. %; Kunimine Industly Co.) was compacted to a dry density of 0.9 and l.35 Mg/m. Since smectite flakes were perpendicularly oriented to a direction of compaction, anisotropy of diffusivity was investigated parallel and normal to the preferred orientation of smectite. Effective diffusion coeficient D of HDO was larger for a diffusional direction parallel to the preferred orientation than normal to that for both dry densities. These results well agreed to the previously reported ones for tritiated water. Activation energies of D in compacted bentonite increased with increasing dry density in the range of 19 - 25 kJ/mol which was slightly larger than that in bulk water (18 kJ/mol). This relationship can be considered to be due to both the pore structure development and high activation energy of water (18-23 kJ/mol) in the vicinity of smectite surface (within 2 nm) on the basis of molecular dynamics simulations.
Konishi, Satoshi; ; Katsuta, Hiroji; ; ; ; Naruse, Yuji
JAERI-M 82-203, 20 Pages, 1983/01
no abstracts in English
Inoue, Haruyuki*; Homma, Yuki; Yamoto, Shohei*; Hatayama, Akiyoshi*
no journal, ,
no abstracts in English
Watanabe, Masashi; Kato, Masato; Sunaoshi, Takeo*
no journal, ,
The oxygen self-diffusion coefficients in mixed oxide (MOX) fuel are successfully measured using an isotope exchange method under H/HO atmosphere. These results are discussed with respect to the activation enthalpy of lattice defects.