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Journal Articles

Conceptual uncertainties in modelling the interaction between engineered and natural barriers of nuclear waste repositories in crystalline rocks

Finsterle, S.*; Lanyon, B.*; ${AA}$kesson, M.*; Baxter, S.*; Bergstr$"o$m, M.*; Bockg${aa}$rd, N.*; Dershowitz, W.*; Dessirier, B.*; Frampton, A.*; Fransson, ${AA}$.*; et al.

Geological Society, London, Special Publications, No.482, p.261 - 283, 2019/00

 Times Cited Count:2 Percentile:26.15

Nuclear waste disposal in geological formations relies on a multi-barrier concept that includes engineered components which in many cases includes a bentonite buffer surrounding waste packages and the host rock. An SKB's (Swedish Nuclear Fuel and Waste Management Co.) Modelling Task Force project facilitated to improve the overall understanding of rock - bentonite interactions, as 11 teams used different conceptualisations and modelling tools to analyse the in-situ experiment at the $"A$ps$"o$ Hard Rock Laboratory. The exercise helped identify conceptual uncertainties that led to different assessments of the relative importance of the engineered and natural barrier subsystems and of aspects that need to be better understood to arrive at reliable predictions of bentonite wetting.

Journal Articles

Preliminary results for natural groundwater colloids in sedimentary rocks of the Horonobe Underground Research Laboratory, Hokkaido, Japan

Sasamoto, Hiroshi; Onda, Shingo*

Geological Society Special Publications, 482, 13 Pages, 2018/09

 Times Cited Count:1 Percentile:50.57

Colloid concentration is an important parameter in models of colloid-facilitated transport. The purpose of present study is to characterize colloid concentrations and colloid stability in natural groundwater from the Horonobe Underground Research Laboratory (URL) as for development of a procedure. The particle sizes of colloids in groundwaters from the Horonobe URL range from several nm to ca. 500 nm, with a mode particle size of ca. 120 nm. Evaluation of colloid stability by DLVO theory suggests that larger colloids (i.e., $$>$$100 nm in diameter) would be more stable than smaller colloids in some groundwaters. The estimated colloid particle concentrations ranged from 2.33$$times$$10$$^{6}$$ to 1.12$$times$$10$$^{8}$$ pt/mL, and mass concentrations were estimated to range from 45 to 1540 $$mu$$g/L for diameters greater than 100 nm. Colloids in Horonobe groundwaters appear to be less stable, with a moderate potential for transport, than colloids investigated in similar international studies. This reduced stability may be due to relatively higher ionic strengths and moderate dissolved organic concentrations in Horonobe groundwaters compared to their international counterparts.

Oral presentation

Investigations of mineral alteration in Kunigel V1 samples contacted with iron obtained from long-term in-situ experiments

Ishidera, Takamitsu; Sasamoto, Hiroshi; Sato, Hisao*

no journal, , 

Compacted bentonite (Kunigel V1) retrieved from the in-situ experiments in the ABM project was investigated to identify the mineralogical alteration of montmorillonite by iron-bentonite interaction in compacted bentonite. Berthierine, Fe-saponite and Fe-chlorite were found as the most possible alteration minerals of montmorillonite. Gypsum and calcite were identified at the contact surface between iron heater and compacted bentonite. These minerals were considered to be formed by the concentrating of salinity in the pore water of compacted bentonite due to the temperature gradient from iron heater.

Oral presentation

Study on methods to prevent piping and erosion in buffer materials intended for a vertical disposal pit, at Horonobe URL

Jo, Mayumi*; Iwatani, Takafumi*; Kawakubo, Masahiro*; Ishii, Tomoko*; Ono, Makoto*; Nakayama, Masashi

no journal, , 

For the purpose of "maintaining the soundness of the artificial barrier," we are studying "restraints on the outflow of the buffer material". We conducted an experiment of a scale of 30 cm to 1 m in an actual underground environment and confirmed the occurrence of the buffer material outflow under water inflow conditions. The experiment in this study was undertaken in order to acquire the necessary data for considering a method to control the outflow of the buffer material.

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