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Journal Articles

Quantifying the porosity of crystalline rocks by in situ and laboratory injection methods

M$"o$ri, A.*; Mazurek, M.*; Ota, Kunio; Siitari-Kauppi, M.*; Eichinger, F.*; Leuenberger, M.*

Minerals (Internet), 11(10), p.1072_1 - 1072_17, 2021/10

 Times Cited Count:2 Percentile:70.88(Geochemistry & Geophysics)

Journal Articles

A Pseudo-material method for graphite with arbitrary porosities in Monte Carlo criticality calculations

Okita, Shoichiro; Nagaya, Yasunobu; Fukaya, Yuji

Journal of Nuclear Science and Technology, 58(9), p.992 - 998, 2021/09

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

Journal Articles

Evaluation report of Task 9B based on comparisons and analyses of modelling results for the $"A$sp$"o$ HRL LTDE-SD experiments

Soler, J. M.*; Meng, S.*; Moreno, L.*; Neretnieks, I.*; Liu, L.*; Kek$"a$l$"a$inen, P.*; Hokr, M.*; $v{R}$$'i$ha, J.*; Vete$v{s}$n$'i$k, A.*; Reimitz, D.*; et al.

SKB TR-20-17, 71 Pages, 2021/07

Task 9B of the SKB Task Force on Modelling of Groundwater Flow and Transport of Solutes in fractured rock focused on the modelling of experimental results from the LTDE-SD in situ tracer test performed at the $"A$sp$"o$ Hard Rock Laboratory in Sweden. Ten different modelling teams provided results for this exercise, using different concepts and codes. Three main types of modelling approaches were used: (1) analytical solutions to the transport-retention equations, (2) continuum-porous-medium numerical models, and (3) microstructure-based models accounting for small-scale heterogeneity (i.e. mineral grains and microfracture distributions). The modelling by the different teams allowed the comparison of many different model concepts, especially in terms of potential zonations of rock properties (porosity, diffusion, sorption), such as the presence of a disturbed zone at the rock and fracture surface, the potential effects of micro- and cm-scale fractures.

Journal Articles

Comparative modeling of an in situ diffusion experiment in granite at the Grimsel Test Site

Soler, J. M.*; Landa, J.*; Havlov$'a$, V.*; Tachi, Yukio; Ebina, Takanori*; Sardini, P.*; Siitari-Kauppi, M.*; Eikenberg, J.*; Martin, A. J.*

Journal of Contaminant Hydrology, 179, p.89 - 101, 2015/08

 Times Cited Count:33 Percentile:84.06(Environmental Sciences)

Matrix diffusion is a key process for radionuclide retention in crystalline rocks. An in-situ diffusion experiment in granite matrix was performed at the Grimsel Test Site (Switzerland). Several tracers (HTO, Na$$^{+}$$, Cs$$^{+}$$) were circulated through a borehole and the decrease in tracer concentrations was monitored for 2.5 years. Then, the borehole section was overcored and the tracer profiles in the rock were analyzed. Transport distances in the rock were 20 cm for HTO, 10 cm for Na$$^{+}$$ and 1 cm for Cs$$^{+}$$. The dataset was analyzed with diffusion-sorption models by different teams using different codes, with the goal of obtaining effective diffusivities (De) and rock capacity factors. There was a rather good agreement between the values from different teams, implied that De and capacity factors in the borehole damaged zone are larger than those in the bulk rock. However, HTO seems to display large discrepancies between measured and modeled results.

Journal Articles

Heat transfer characteristics of the steam reformer in the HTTR hydrogen production system

Takeda, Tetsuaki

Proceedings of 12th International Conference on Nuclear Engineering (ICONE-12) (CD-ROM), 4 Pages, 2004/00

no abstracts in English

Journal Articles

Rim structure formation of isothermally irradiated UO$$_{2}$$ fuel discs

Une, Katsumi*; Nogita, Kazuhiro*; Shiratori, Tetsuo; Hayashi, Kimio

Journal of Nuclear Materials, 288(1), p.20 - 28, 2000/09

 Times Cited Count:19 Percentile:79.12(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Density, porosity and grain size, 2; Irradiated ROX fuels to burn-up of 28%FIMA

Yanagisawa, Kazuaki; Yamashita, Toshiyuki; Kanazawa, Hiroyuki; Amano, Hidetoshi; Muromura, Tadasumi

Journal of Nuclear Science and Technology, 36(12), p.1153 - 1159, 1999/12

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Density, porosity and grain size, 1; Unirradiated ROX fules

Yanagisawa, Kazuaki; Yamashita, Toshiyuki; Kanazawa, Hiroyuki; Amano, Hidetoshi; Muromura, Tadasumi

Journal of Nuclear Science and Technology, 36(11), p.1052 - 1063, 1999/11

 Times Cited Count:1 Percentile:13.47(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

A Study on density, porosity and grain size of unirradiated ROX fules and simulated ROX fuels

Yanagisawa, Kazuaki; Omichi, Toshihiko*; Shirasu, Noriko; Yamashita, Toshiyuki; ; Onozawa, Atsushi; ; Kanazawa, Hiroyuki; Kanaitsuka, Fumio; Amano, Hidetoshi

JAERI-Tech 99-044, 46 Pages, 1999/05

JAERI-Tech-99-044.pdf:4.66MB

no abstracts in English

Journal Articles

A Method of estimation bulk density of high-grade uranium ore

Iida, Yoshimasa

Donen Giho, (104), p.135 - 140, 1997/12

Uranium ore in the Athabasca region, Canada, is highly variable in density. This is due to large variations in the grade of high-density uranium and associated metalliferous minerals, and also to changes in porosity. As it is not practical to take accurate measurements of dry bulk density values of a large number of samples. As a result of investigation on actual ore samples, it has been found practical to estimate the dry bulk density of ore from measured wet bulk density and grain density calculated from chemical data.

Journal Articles

Diffusion of an ion in rock pore water and its relation to pore characteristics

*; ; *; *

Kozan Chishitsu, 40(5), p.323 - 336, 1990/00

no abstracts in English

Journal Articles

Journal Articles

Measurement of diffusion and sorption of radionuclides in rocks

; ; *;

Journal of Nuclear Science and Technology, 22(10), p.833 - 840, 1985/00

 Times Cited Count:3 Percentile:47.5(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Determination of effective conductivity of porous ceramic separators of LiAl/LiCl-KCl/FeS sells

; H.Shimotake*

Proc.Symp.on Lithium Batteries, p.404 - 411, 1981/00

no abstracts in English

JAEA Reports

JAEA Reports

Densification of uranium dioxide fuel pellets, (1)

; ; Ichikawa, Michio

JAERI-M 6904, 23 Pages, 1977/02

JAERI-M-6904.pdf:1.02MB

no abstracts in English

Journal Articles

Porosity dependence of thermal conductivity of uranium mononitride

; ;

Journal of Nuclear Materials, 45(4), p.284 - 292, 1973/04

 Times Cited Count:19

no abstracts in English

Oral presentation

Characteristics of two-phase pressure drop in a simulated debris bed

Ito, Daisuke*; Kurisaki, Tatsuya*; Ito, Kei*; Saito, Yasushi*; Aoyagi, Mitsuhiro; Matsuba, Kenichi; Kamiyama, Kenji

no journal, , 

In order to evaluate characteristics of debris-bed coolability in the core region, characteristics of the pressure loss in the debris-bed under liquid-gas two phase flow is required to be understood. In this study, effects of porosity distribution on pressure loss and void-fraction distribution in the test section are presented.

18 (Records 1-18 displayed on this page)
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