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Journal Articles

Evaluating test conditions for in situ tracer migration test in fractured siliceous mudstone involving groundwater with dissolved gas

Takeda, Masaki; Ishii, Eiichi; Ono, Hirokazu; Kawate, Satoshi*

Genshiryoku Bakkuendo Kenkyu (CD-ROM), 25(1), p.3 - 14, 2018/06

Fault zones and excavation damaged zones have the potential to act as flow paths, and the characterization of solute transport in such zones in mudstones is important for the safe geological disposal of radioactive waste. However, few in situ tracer migration tests have been conducted on fractures in mudstones. The Japan Atomic Energy Agency has conducted in situ tracer migration experiments using uranine, for fractures in siliceous mudstone of the Wakkanai Formation. 18 experiments were conducted under various conditions An injection flow rate that is slightly higher than the pumping flow rate is ideal for tracer migration experiments involving injection and pumping, as conducted in this study. In situ tracer migration experiments involving injection and pumping conducted in a groundwater environment with dissolved gases allow empirical evaluation of the relationship of the tracer recovery ratio and the groundwater degassing with the injection and pumping flow rate ratio. This evaluation is effective for the design of experimental conditions that account for degassing and ensure high levels of tracer recovery.

JAEA Reports

Collection of measurement data in 2013 fiscal year at the Horonobe Underground Research Laboratory Project

Aoyagi, Kazuhei; Kawate, Satoshi

JAEA-Data/Code 2015-017, 118 Pages, 2015/12


In the Horonobe Underground Research Laboratory (URL) Project, construction of the Ventilation Shaft, the East and West Access Shafts and the drifts has been conducted as a phase II research. In the research, observation of the lithofacies and fractures, and in-situ tests are conducted in each face. In addition, measuring instruments such as tunnel lining concrete stress meter and extensometer are installed in particular face for the purpose of the validation of the results of predictive analysis, conducted in phase I. This report summarizes the measurements data acquired at the 350 m Gallery and the ventilation shaft.

Oral presentation

In situ diffusion experiment for siliceous mudstone at the Horonobe URL

Ono, Hirokazu; Takeda, Masaki; Ishii, Eiichi; Kawate, Satoshi

no journal, , 

It is necessary to clarify the mass transport behavior in a deep underground natural barrier, for improving the reliability of safety assessment of high-level radioactive waste disposal. In situ mass transport experiments are being conducted for fractures and rock matrices at the G.L. -350 m gallery in the Horonobe Underground Research Laboratory (URL). This study reports an overview and preliminary results of in situ diffusion experiments for rock matrices.

Oral presentation

In-situ tracer migration tests for fractures in siliceous mudstone; Setting of test conditions under groundwater environment involving dissolved-gas

Takeda, Masaki; Ishii, Eiichi; Ono, Hirokazu; Kawate, Satoshi

no journal, , 

no abstracts in English

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