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*; Ijiri, Yuji*; *; *
JNC TN8400 2000-021, 66 Pages, 2000/04
JNC-TN8400-2000-021.pdf:4.38MB
A reliability evaluation for radionuclide transport analysis code, MATRICS, used in radionuclide transport analysis in the natural barrier system PA in H12 report has been carried out. Sensitivity analysis to radionuclide transport parameter in MATRICS and analytical solution has been performed, and the results of each analysis have been compared. Additionally sensitivity analysis using Talbot Method, Crump method and Hosono method has been carried out, and the results of each inverse Laplace transform method has been compared. The conclusions obtained from the results of the evaluation are summarized as follows, (1)In case of the infinite matrix diffusion distance, an error among the results of each calculation is maximum about 0.4% in the range of Pe number from 1.0 to 100. And, an error among the results of each calculation is maximum about 5.5% in the range of transmissivity from 1.0
10
to 1.010
(m
/s). (2)In case of the finite matrix diffusion distance (0.03
1.0(m)), an error among the results of each calculation is maximum about 0.7% in the range of Pe number from 1.0 to 100. And, an error among the results of each calculation is maximum about 2.4% in the range of transmissivity from 1.010 to 1.010(m/s). 3)By comparing Talbot method with other inverse Laplace transform method, Talbot method is confirmed to give similar results with other inverse Laplace transform method in the range of Pe number from 5.010
to 2.010
, and that of transmissivity below 1.010
(m/s). Therefore, it is concluded that the reliability of MATRICS are confirmed by conducting sensitivity analysis in the range of Pe number and transmissivity coefficient used in H12 report.
Suzuki, Satoru; ; *
JNC TN8400 2000-020, 25 Pages, 2000/04
JNC-TN8400-2000-020.pdf:0.94MB
Nature of porewater in bentonite plays important roles on the mass transport in the compacted bentonite used as a physical and chemical buffer material of the multi-barrier system in the high level radioactive waste manegement Higher activation energies of diffusion in the compacted bentonite than those in the aqueous solution is due probably to change in molecular structure of water in the porewater. The Raman spectroscopy was applied to studying the structure of porewater in bentonite at room temperature. Bentonite (Kunipia F, 98-99wt% of Na-smectite) was mixed with ion-exchanged water by water content of 75, 80, 90, 95 and 98wt% of water or with 0.5M NaCl aqueous solution by 75 and 80wt% of NaCl solution. Intensity maxima of the spectra of ion exchanged water, NaCl solution and their porewater were observed near 3200 to 3250, 3400, 3630cm. These bands can be attributed to water molecules forming stronger hydrogen bond in this manner. Ratio of intensity, 3250cm/3400cm, increased from 0.97 to 1.1 with a decrease in water content of 100wt% (water) to 75wt%. On the other hand, intensity ratio of 3400cm/3250cm of NaCl aqueous solution, 80wt%and 75wt% were 0.92, 1.2 and 1.3, respectively. Since the Raman scattering near 3250cm was attributed to water molecule forming the strongest hydrogen bonding in the three bands, those changes in intensity ratio suggests an increase in number of water molecule forming strong hydrogen bond in porewater of the bentonite. The constrained porewater possibly results in the high activation energy of diffusion in the compacted bentonite.
Nishi, Hiroshi; Araki, Toshimitsu*; Eto, Motokuni
Fusion Engineering and Design, 39-40, p.505 - 511, 1998/00
Times Cited Count：27 Percentile：87.35(Nuclear Science & Technology)no abstracts in English
Suzuki, Atsuyuki*; Nagasaki, Shinya*
PNC TJ1602 92-001, 75 Pages, 1992/03
For the safety assessment of high level waste disposal system, it is important to understand the migration behaviors of actinides in the near- or far-field. Although the importance of migration of actinides which form the colloids has been pointed out recently, the migration behaviors of colloids are not fully understood. In this study, the migration behaviors of colloids were investigated experimentally by column method. In the experiments, quartz powder was used as the solid. Ferric hydrous oxide colloids were prepared as the real colloids and neptunium(V) formed Np(V)-Fe(III) pseudocolloids by sorption. Some fractions of the colloids eluted with the eluting solution. Also observed were strongly retarded fractions. Non-negligible fractions were found to migrate faster than the eluting solution. These migration characteristics were qualitatively understood in this work.
; ;
Journal of Nuclear Science and Technology, 26(8), p.811 - 813, 1989/08
no abstracts in English
