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JAEA Reports

Natural Analogue Studies (second) of Long Term Alteration of Volcanic Glass under the High Level Radioactive Waste Disposal Conditions

Futakuchi, Katsuhito*; Hiroki, Minenari*; Sakuramoto, Yuji*

JNC TJ8400 2004-010, 33 Pages, 2004/02

JNC-TJ8400-2004-010.pdf:7.57MB

The alteration characteristics of volcanic glass in geological medium are investigated as natural analogues of geological disposal of high-level radioactive wastes. This study leads to the following conclusion. The activation energy was calculated for changes from volcanic glasses to clinoptilolite is 176.27KJ/mol.

JAEA Reports

Installation of the Groundwater Monitoring System to Borehole DH-2

Wakahama, Hiroshi*; Nakata, Mitsuhiko*; Hiroki, Minenari*; Futakuchi, Katsuhito*; Okada, Akio*

JNC TJ7440 2003-004, 128 Pages, 2003/03

JNC-TJ7440-2003-004.pdf:15.57MB

This report describes the results of installation of the long-term groundwater monitoring system into borehole DH-2 as a part of the Regional Hydrogeological Study and Mizunami Underground Research Laboratory Project. DH-2 was driglled with 100mm diameter through Toki-granite to the depth of 501meter below the ground level, in which 5inch-steel-casing pipe was inserted to the depth of 171m. The monitoring system was composed of concentrically arranged seven open PVC(polyvinyl chloride)-stand-pipes("Piezo-pipes"), housed within outer 4inch PVC-casings, followed by 3inch PVC-casings, packers and several stainless steel units. In the system, seven monitoring zones were isolated by expandable rubber type packers inflating with water. From the view point of quality assessment, leak-off tests were conducted for all of 7 packers before the shipment and the installation at the site. In terms of individual casing joints, air-tight inspections were carried out ...

JAEA Reports

Natural analogue studies of long term alterration of volcanic glass under the high level radioactive waste disposal conditions

Futakuchi, Katsuhito*; Sakuramoto, Yuji*; Hiroki, Minenari*

JNC TJ8400 2003-006, 50 Pages, 2003/01

JNC-TJ8400-2003-006.pdf:10.85MB

The alteration characteristics of volcanic glass and bentonite in geological medium are investigated as natural analogues of geological disposal of high-level radioactive wastes. For the study of alterlation of volcanic glass, literature survey, petrographical observation by using optical microscope, chemical analysis of pore water and groundwater, and microbiostratigraphical study were carried out. The volcanic ashes were collected from a borehole, which had been drilled in the Kanto region by the National Research Institute for Earth Science and Disaster Prevention. The volcanic glass was wholly altered in thin sections. Chemical analysis of pore water indicate the chloride-rich composition. And chemical analysis of groundwater, which are pumped up near the studied borehole, indicate the mixing product of connate marine water and fresh groundwater. Fossil evidence suggests that the studied volcanic glass is 3.65$$sim$$4.2Ma. in age, and is correlated with upper Miura Group. This study leads to the following conclusion. The volcanic glass, under the temperature condition 70$$^{circ}$$C, was wholly altered to montomorillonite and clinoptilolite. This case must be occurred in the connate marine water at last 0.5 Ma..

JAEA Reports

Natural analogue studies of long term alteration of volcanic glass and bentonite in alkaline conditions.

Futakuchi, Katsuhito*; Sakuramoto, Yuji*; Hiroki, Minenari*

JNC TJ8400 2001-046, 61 Pages, 2002/02

JNC-TJ8400-2001-046.pdf:2.45MB

The alteration characteristics of volcanic glass and bentonite in geological medium are investigated as natural analogues of geological disposal of high-level radioactive wastes. For the study of volcanic glass, volcanic ashes are collected from boreholes, which were drilled in the Kanto region by the National Research Institute for Earth Science and Disaster Prevention. The volcanic glass, under the temperature condition 70$$^{circ}$$C, was altered to montomorillonite and clinoptilolite, but another volcanic glass, under the temperature condition up to 50$$^{circ}$$C, was not altered. Both cases may be occurred in the connate marine water at last 0.5 Ma For the study of bentonite, slight alkaline hot spring water (pH: up to 9) and rocks in Rausu area, Hokkaido Prefecture, have been studied to examine the zeolitization of montmorillonite. X-ray diffraction analysis show that montmorillonite, kaolinite, mordenite, and alunite were recognized as the alteration minerals. Alkaline (pH:up to 9) and high temperature (about 90$$^{circ}$$C) water (Na$$^{+}$$ - Cl$$^{-}$$ type) were found at several outcrops, chemical and isotopic analysis show that those alkali hot spring waters were meteoric origin, increasing of salinity were as a result of seepage through the marine sedimentary strata, and high temperature was derived from the heat source. Stability relationship for system anorthite - kaolinite - montmorillonite - silica minerals - aqueous solution shows that montmorillonite was stable in those spring water.

JAEA Reports

A Natural analogue of illitization of bentonite: A Contact metamorphism by the nishikubiki hypabyssal rock in niigata prefecture, Japan

Futakuchi, Katsuhito*; Hashimoto, Shuji*; Sakuramoto, Yuji*; ;

JNC TN8400 2001-007, 52 Pages, 2001/04

JNC-TN8400-2001-007.pdf:2.68MB

As a natural analogue, the authors investigted a Tertiary argillaceous bed and a Quarternary hypabyssal rock (porphyrite) which intruded into the argillaceous rock, distributed in the Nishikubiki district of Niigata prefecture in Japan. We examined the variation of clay mineral species in the argillaceous rock surrounding the intrusive rock and carried out thermal analyses for the argillaceous rock based on the coolig history of the intrusive rock. The predominant clay mineral varied from montmorillonite to illite through illite/montmorillonite interlayers with approaching to the intrusive rock. The thermal analyses indicated that the temperature descended from 270 to 15 $$^{circ}$$C during the 7.5$$times$$ 10$$^{5}$$ years at alocalty of argillaceous rock containing 75% illite in the interlayers. On the assumption that the alteration from montmorillonite to illite was regarded as a first-order reaction, we evaluated the apparent activation energy based on the thermal condition mentioned above; about 103 kJ/mol was obtained for this illitization. This was within the range of values reported previously by laboratory experiments and/or examinations of natural illitizations.

JAEA Reports

Studies of long term alteration of volcanic glass and bentonite and of long term immobility of iodine in Geological medium

Futakuchi, Katsuhito*; *; *; *; Hashimoto, Shuji*

JNC TJ8400 99-044, 72 Pages, 1999/02

JNC-TJ8400-99-044.pdf:4.68MB

The alteration characteristics of volcanic glass and bentonite and immobility of iodine in geological medium are investigated as a part of the natural analogue study of geological disposal of high-level radioactive waste. For the study of volcanic glass, volcanic ashes (08) are collected at Kamogawa area in Chiba Prefecture which ejected Pleistocene (ca. 1.0 Ma.) to examine the hydration in underground condition. Optical analysis, espetially reflaction index measurement show that volcanic ashes (08) were wholly hydrated. For the study of bentonite, marine argillaceous rocks in Nishikubiki area, Niigata Prefecture have been studied to determine the thermal history of this area. In order to estimate the temperature on contact of inturusive body and argillaceous rocks, measurement of homoginized temperature of fluid inclusion and observation under the optical microscope. For the study of iodine immobility in geological medium, iodine-bearing groundwater in Mobara Gas field, Chiba Prefecture, were discussed.

JAEA Reports

None

*; *; Futakuchi, Katsuhito*

PNC TJ7308 98-007, 396 Pages, 1998/03

PNC-TJ7308-98-007.pdf:14.86MB

None

JAEA Reports

None

Futakuchi, Katsuhito*; Sakuramoto, Yuji*; *; *; *; Hashimoto, Shuji*

PNC TJ1308 98-001, 103 Pages, 1998/02

PNC-TJ1308-98-001.pdf:19.05MB

None

JAEA Reports

Studies of long term alterlation of volcanic glass and bentonite

Futakuchi, Katsuhito*; Sakuramoto, Yuji*; *; *; *

PNC TJ1308 97-001, 295 Pages, 1997/02

PNC-TJ1308-97-001.pdf:22.27MB

None

JAEA Reports

None

Futakuchi, Katsuhito*; Sakuramoto, Yuji*

PNC TJ1308 96-001, 83 Pages, 1996/03

PNC-TJ1308-96-001.pdf:3.28MB

None

JAEA Reports

None

Futakuchi, Katsuhito*; Sakuramoto, Yuji*

PNC TJ1308 94-002, 105 Pages, 1994/02

PNC-TJ1308-94-002.pdf:3.63MB

None

JAEA Reports

None

Futakuchi, Katsuhito*; Sakuramoto, Yuji*

PNC TJ1308 94-001, 37 Pages, 1994/02

PNC-TJ1308-94-001.pdf:1.55MB

None

JAEA Reports

Studies of long term alterlation and behavior of volcanic glass and bentonite

Futakuchi, Katsuhito*; Sakuramoto, Yuji*

PNC TJ1308 92-002, 40 Pages, 1992/02

PNC-TJ1308-92-002.pdf:1.16MB

None

JAEA Reports

Studies of long term alterlation and behavior of volcanic glass and bentonite

Futakuchi, Katsuhito*; Sakuramoto, Yuji*

PNC TJ1308 92-001, 107 Pages, 1992/02

PNC-TJ1308-92-001.pdf:3.17MB

None

JAEA Reports

None

Futakuchi, Katsuhito*; Sakuramoto, Yuji*

PNC TJ1308 91-001, 43 Pages, 1991/01

PNC-TJ1308-91-001.pdf:1.13MB

None

Oral presentation

Development of micro-chemical probe for geological environment diagnosis, 15; Application of micro-chemical probe to Mizunami Undergoround Research Laboratory Project

Uchida, Masahiro; Amano, Kenji; Hama, Katsuhiro; Takeuchi, Ryuji; Yoshida, Takuma*; Noshita, Kenji*; Futakuchi, Katsuhito*; Oe, Toshiaki*; Nagasaki, Shinya*

no journal, , 

no abstracts in English

Oral presentation

Development of micro-chemical probe for characterization of geological environment

Hama, Katsuhiro; Uchida, Masahiro; Amano, Kenji; Takeuchi, Ryuji; Hagiwara, Hiroki; Yoshida, Takuma*; Noshita, Kenji*; Nagasaki, Shinya*; Oe, Toshiaki*; Futakuchi, Katsuhito*

no journal, , 

The micro-chemical probe for characterization of geological environment has been developed. The performance test shows that this equipment can be applicable for the in-situ experiment.

17 (Records 1-17 displayed on this page)
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