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*; Kanazawa, Yasuo*;
JNC TN8400 2001-012, 69 Pages, 2001/04
JNC-TN8400-2001-012.pdf:6.87MB
On understanding the radionuclide transport in natural barrier in radioactive waste isolation research, the macroscopic dispersion in heterogeneous permeability field in the underground rock is regarded as an important process. Therefore, we have conducted lots of tracer experiments by the MACRO II facility with an artificially constructed heterogeneous permeability field. In order to study the scale dependence of dispersion coefficients in case of laboratory experiments, we placed the flow cell horizontally, and conducted injection-withdraw tracer experiment with a single well. We have conducted I5 cases experiments. These cases were prepared by changing a position of single well and the injection-withdraw time. At each position we have conducted 9 cases and 6 cases experiments. In this report, we evaluated the macroscopic dispersion coefficients by the fitting of analytical solution to breakthrough curve measured by the 15 cases pumping tracer experiment. Consequently, we could evaluate the dispersion coefficients for 12 cases of 15 cases. Then, we discussed the relation between a injection-withdraw flow rate and a property of heterogeneous media and dispersion coefficient. The conclusions obtained from the results of the evaluation are summarized as follows, (1)It was found that the macroscopic dispersion coefficients tend to be increased with increase of the average radius of tracer front spread around a single well. (2)We have conducted any experiments with s single well settled at two positions. In case of that there is low permeability around a single well, we found dispersion coefficients are large. In case of that there is high permeability around a single well, we found dispersion coefficients are small. (3)In three cases that we could not evaluate because of incorrect accuracy of fitting, we have found it possible that there is some points that dispersion coefficients were strikingly small in tracer front.
Shirai, Hiroshi; Shimizu, Katsuhiro; Hayashi, Nobuhiko; Itakura, Hirofumi*; Takase, Keizo*
JAERI-Data/Code 2000-040, 214 Pages, 2001/01
JAERI-Data-Code-2000-040.pdf:7.89MB
no abstracts in English
Nagasaki, Shinya*
JNC TJ8400 2000-004, 32 Pages, 2000/02
JNC-TJ8400-2000-004.pdf:0.69MB
Equilibrium and kinetics of sorption of NpO
on illite were investigated at pH = 6 by using the differential pulse anodic stripping voltammetry method and the spectroscopic method, respectively. It was found that the sorption isotherm obtained was fitted better by the Langmuir-Freundlich type equation than by the Langmuir equation. The heterogeneity coefficient was 0.89 
0.05 and the half width at half maximum (HWHM) of affinity spectrum was 0.19 log unit, indicating that the surfacc of illite used has a low degree of heterogeneity. The kinetic spectra indicated that the sorption of NpO occurs only at the outer surfacc. The mean HWHM of the kinetic spectra was 0.18 log unit. This also proves that the sorption kinetics of NpO on the illite used is controlled by the same heterogeneity of the sorption sites. From the dependence of mean rate constants on temperature, a mean apparent activation enthalpy and a mean apparent activation entropy were evaluated at 373 kJ/mol and - 69 7 J/K
mol, respectively. This value of enthalpy suggests that the sorption is not controlled by diffusion through the hydrodynamic film around the illite. Equilibrium and kinetics of sorption of NpO and Np(V) carbonate complexes (mainly NpO
CO
) on Na-montmorillonite were also examined by using same technique.
Fe
and YFeN
(x=2.1-2.6)*; Morii, Yukio; *; *
Physica B; Condensed Matter, 213&214, p.294 - 296, 1995/00
Times Cited Count：5 Percentile：36.65(Physics, Condensed Matter)no abstracts in English
Shirai, Hiroshi; Hirayama, Toshio; Shimizu, Katsuhiro; Tani, Keiji; Azumi, Masafumi; Hirai, Kenichiro*; Konno, Satoshi*; Takase, Keizo*
JAERI-M 93-026, 97 Pages, 1993/02
no abstracts in English
Onuki, Toshihiko
Waste Management 87, Vol.3, p.213 - 217, 1987/00
no abstracts in English
-Ray Spectrum with use of Mini-Size Computers*
JAERI-M 84-104, 28 Pages, 1984/06
no abstracts in English
Tasaka, Kanji
JAERI-M 6145, 74 Pages, 1975/06
no abstracts in English
; ; ;
JAERI-M 5659, 40 Pages, 1974/04
no abstracts in English
; ; ;
JAERI-M 5597, 37 Pages, 1974/03
no abstracts in English
; ; ;
JAERI-M 5596, 33 Pages, 1974/03
no abstracts in English
; ;
JAERI-M 5556, 44 Pages, 1974/02
no abstracts in English
Tasaka, Kanji
JAERI-M 5067, 36 Pages, 1972/12
no abstracts in English
-ray Spectrum from Semiconductor DetectorsTasaka, Kanji
JAERI-M 5016, 45 Pages, 1972/10
no abstracts in English
;
JAERI-M 4703, 28 Pages, 1972/02
no abstracts in English
Ray SpectrumTasaka, Kanji
JAERI-M 4571, 26 Pages, 1971/09
no abstracts in English
Yoneda, Yasuhiro; Nakata, Kengo*; Ohara, Koji*
no journal, ,
We analyze real-space fit and inverse Monte Carlo method (RMC) using the same material data and compare the results obtained to characterize each analysis method. We will report the result of barium titanate (BaTiO). BaTiO is one of the substances whose real space fit is very difficult because Ba with high ionicity and Ti with high covalent bond are mixed. We discussed how to extract comparable data from the structural parameters obtained by each analysis method.
