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JAEA Reports

Effect of leachate of cementitious materials on the geological media; Experimental study of the influence of high pH plume on rock

Kato, Hiroshige*; Sato, Mitsuyoshi*; Owada, Hitoshi*; Mihara, Morihiro;

JNC-TN8430 2000-008, 53 Pages, 2000/05

JNC-TN8430-2000-008.pdf:3.56MB

Cementitious materials will be used in TRU waste disposal repository. In such cases, it is considered that the migration of alkaline leachates from cementitious materials, so called high pH plume, will cause dissolution of rock and precipitation of secondary minerals. In addition, the high pH plume will move along the flow of groundwater, so it is predicted that rock formation and components of high pH groundwater vary with time and space. However, time and spatial dependence of the variations of secondary minerals and groundwater components has not been clarified. In order to acquire the data of variations of secondary minerals and groundwater components, we carried out the rock alteration experiments with column method. The crushed granodiorite was filled into 4 meters length column ($$phi$$3.7 cm) and artificial cement leachate (pH=13.3; Na=0,1 mol/l, K=0.1 mol/l, Ca=0.002 mol/l) was streamed at flow rates of 0.1 ml/min for 7 months at 80$$^{circ}$$C. As the result, secondary minerals confirmed on the rock were calcite and C-S-H at upstream of column and C-S-H at mid-downstream. The pH value of the fluid dominated by Na and K did not be decreased by reaction with the rock. In this study, the data relating to the effect of high pH plume on rock over the long term was acquired.

JAEA Reports

Groundwater Evolution Modeling for the Second Progress Performance Assessment (PA) Report

Yui, Mikazu; Sasamoto, Hiroshi; Randolph C Arthu*

JNC-TN8400 99-030, 201 Pages, 1999/07

JNC-TN8400-99-030.pdf:7.85MB

According to the Japanese program for research and development of high level radioactive waste (HLW) disposal defined by Atomic Energy Commission (AEC), the second progress report (i.e., H-12 report) for performance assessment (PA) of HLW disposal is to be published by the Japan Nuclear Cycle Development Institute (JNC) and submitted to the Japanese government before the year 2,000 (AEC, 1997). This report presents the establishment of generic groundwater chemical compositions for the PA supporting the H-12 report. The following five hypothetical groundwaters are categorized for PA based on the results of the first progress report (i.e., H-3 report) and binaly statistical analyses of the screened groundwater dataset: (1)FRHP(Fresh-Reducing-High-pH) groundwater (2)FRLP(Fresh-Reducing-Low-pH) groundwater (3)SRHP(Saline-Reducing-High-pH) groundwater (4)SRLP(Saline-Reducing-Low-pH) groundwater (5)MRNP(Mixing-Reducing-Neutral-pH) groundwater. In order to define representative groundwater compositions for the PA for the H-12 report, JNC has established the representativeness of the above five hypothetical groundwaters by considering the results of multivariate statistical analyses, data reliability, evidence for geochemical controls on groundwater chemistry and exclusion criteria for potential repository sites in Japan. As a result, the following hypothetical reference groundwaters are selected for the performance assessment analysis in H-12 report, respectively: (1)Reference Case groundwater: FRHP groundwater, and (2)Alternative Geological Environment Case groundwater: SRHP groundwater. In addition, JNC has consulted with overseas experts on the concepts used in groundwater evolution modeling. This modeling effort has focussed on simulating equilibrium water-rock interactions to predict groundwater compositions resulting from reactions between initial water compositions and rock mineral assemblages. These discussions have centered on recommendations for developing ...

Journal Articles

Liferature review; Behavior of smectites in high pH conditions

Sato, Tsutomu

Sumekutaito Kenkyukai Kaihou, 8(2), p.44 - 46, 1998/00

no abstracts in English

Journal Articles

Effects of environmental factor on gas evolution behavior from Al in simulating mortar environments

Hashizume, Shuji; Matsumoto, Junko; Bamba, Tsunetaka

Zairyo To Kankyo, 47(10), p.638 - 644, 1998/00

no abstracts in English

Journal Articles

Characteristics of migration of $$^{85}$$Sr and $$^{137}$$Cs in alkaline solution through sandy soil

Onuki, Toshihiko

Mater. Res. Soc. Symp. Proc., Vol. 212, p.609 - 616, 1991/00

no abstracts in English

Oral presentation

Sorption behavior of tin onto montmorillonite under cementitious conditions

Ito, Miki*; Akagi, Yosuke*; Kitamura, Akira

no journal, , 

Distribution coefficient of Sn onto Na-type and Ca-type montmorillonite samples was determined under high-pH conditions with a batch method. It was suggested that sorption behavior of Sn under cementitious conditions was affected through changing major aqueous species accompanied with pH change.

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