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JAEA Reports

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Compilation of groundwater chemistry data in the Mizunami group and the Toki granite (fiscal year 2017)

Fukuda, Kenji; Watanabe, Yusuke; Murakami, Hiroaki; Amano, Yuki; Hayashida, Kazuki*; Aosai, Daisuke*; Kumamoto, Yoshiharu*; Iwatsuki, Teruki

JAEA-Data/Code 2018-021, 76 Pages, 2019/03

JAEA-Data-Code-2018-021.pdf:3.78MB

Japan Atomic Energy Agency has been investigating groundwater chemistry to understand the influence of excavation and maintenance of underground facilities as part of the Mizunami Underground Research Laboratory (MIU) Project in Mizunami, Gifu, Japan. In this report, we compiled data of groundwater chemistry and microbiology obtained at the MIU in the fiscal year 2017. In terms of ensuring traceability of data, basic information (e.g. sampling location, sampling time, sampling method and analytical method) and methodology for quality control are described.

JAEA Reports

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Compilation of groundwater chemistry data in the Mizunami group and the Toki granite (fiscal year 2016)

Watanabe, Yusuke; Hayashida, Kazuki; Kato, Toshihiro; Kubota, Mitsuru; Aosai, Daisuke*; Kumamoto, Yoshiharu*; Iwatsuki, Teruki

JAEA-Data/Code 2018-002, 108 Pages, 2018/03

JAEA-Data-Code-2018-002.pdf:6.53MB

Japan Atomic Energy Agency has been investigating groundwater chemistry to understand the effect of excavation and maintenance of underground facilities as part of the Mizunami Underground Research Laboratory (MIU) Project in Mizunami, Gifu, Japan. In this report, we compiled data of groundwater chemistry and microbiology obtained at the MIU in the fiscal year 2016 and 2014 to 2016, respectively. In terms of ensuring traceability of data, basic information (e.g. sampling location, sampling time, sampling method and analytical method) and methodology for quality control are described.

Journal Articles

Evaluation of hydrogeochemical processes provoked by tunnel excavation and closure based on simulated experiment in a mock-up test drift

Hayashida, Kazuki; Kato, Toshihiro*; Kubota, Mitsuru*; Murakami, Hiroaki; Amano, Yuki; Iwatsuki, Teruki

Chikyu Kagaku, 52(1), p.55 - 71, 2018/03

In this study, the simulated experimental drift was constructed in the granite of 500 m depth at Mizunami Underground Research Laboratory, and the hydrochemical process after the drift closure was observed. The groundwater chemistry around the drift changed with the change of the groundwater flow in the fractures when the gallery was constructed. The redox potential increased due to the infiltration of oxygen from the drift into the rock. After closing the drift, the redox potential of the groundwater plunged due to microbial activity, while the groundwater became alkalized conditon due to the influence of cement material such as shotcrete. The amount of cement material consumed for this alkalization was small, and it was considered that its influence would last long in accordance with the amount of cement used.

Journal Articles

Characterization of rare earth elements (REEs) associated with suspended particles in deep granitic groundwater and their post-closure behavior from a simulated underground facility

Iwatsuki, Teruki; Munemoto, Takashi*; Kubota, Mitsuru*; Hayashida, Kazuki; Kato, Toshihiro*

Applied Geochemistry, 82, p.134 - 145, 2017/05

AA2017-0090.pdf:2.35MB

 Times Cited Count:2 Percentile:78.18(Geochemistry & Geophysics)

This study investigated the behavior of rare earth elements (REEs) associated with suspended particles in deep granitic groundwater and in a sealed drift at a depth of 500 m in the Mizunami Underground Research Laboratory (URL) in Japan. Approximately 10%$$sim$$60% of REEs in groundwater are associated with suspended particles. Carbonate particles in groundwater are most likely derived from in situ precipitation of supersaturated carbonate minerals such as calcite. Thermodynamic calculations show that the dissolved REE carbonate complexes in the closed drift decreased in the drift closure period. These complexes may have been absorbed or co-precipitated within the shotcrete on the drift wall. The usage of cement based materials would generate environmental conditions in which REEs are fundamentally immobile in and around the underground facilities.

JAEA Reports

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Compilation of groundwater chemistry data in the Mizunami group and the Toki granite (fiscal year 2015)

Hayashida, Kazuki; Kato, Toshihiro; Munemoto, Takashi; Aosai, Daisuke*; Inui, Michiharu*; Kubota, Mitsuru; Iwatsuki, Teruki

JAEA-Data/Code 2017-008, 52 Pages, 2017/03

JAEA-Data-Code-2017-008.pdf:3.84MB

Japan Atomic Energy Agency has been investigating groundwater chemistry to understand the effect on excavating and maintenance of underground facilities as part of the Mizunami Underground Research Laboratory (MIU) Project in Mizunami, Gifu, Japan. In this report, we compiled data of groundwater chemistry obtained at the MIU in the fiscal year 2015. In terms of ensuring traceability of data, basic information (e.g. sampling location, sampling time, sampling method, analytical method) and methodology for quality control are described.

JAEA Reports

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Compilation of groundwater chemistry data in the Mizunami group and the Toki granite (fiscal year 2014)

Hayashida, Kazuki; Munemoto, Takashi; Aosai, Daisuke*; Inui, Michiharu*; Iwatsuki, Teruki

JAEA-Data/Code 2016-001, 64 Pages, 2016/06

JAEA-Data-Code-2016-001.pdf:3.19MB

Japan Atomic Energy Agency has been investigating groundwater chemistry to understand the effect on excavating and maintenance of underground facilities as part of the Mizunami Underground Research Laboratory (MIU) Project in Mizunami, Gifu, Japan. In this report, we compiled data of groundwater chemistry obtained at the MIU in the fiscal year 2014. In terms of ensuring traceability of data, basic information (e.g. sampling location, sampling time, sampling method, analytical method) and methodology for quality control are described.

Oral presentation

Development of an in-situ SEOP $$^3$$He spin filter

Hayashida, Hirotoshi; Oku, Takayuki; Kira, Hiroshi*; Sakai, Kenji; Ino, Takashi*; Shinohara, Takenao; Oyama, Kenji*; Takata, Shinichi; Oishi, Kazuki*; Takeda, Masayasu; et al.

no journal, , 

no abstracts in English

Oral presentation

Redox resilience of granitic rock for a large scale underground facility construction and operation

Iwatsuki, Teruki; Hayashida, Kazuki; Kato, Toshihiro; Munemoto, Takashi; Kubota, Mitsuru

no journal, , 

Redox change around drift and MIU facility were observed to estimate redox resilience of granitic rock for facility construction and operation. Redox potential in the vicinity of research gallery and MIU facility heterogeneously changed from -200 to -100 mV in two years according to geological structure.

Oral presentation

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Development of gas-strip techniques of dissolved inorganic carbon for dating groundwater

Kato, Toshihiro; Iwatsuki, Teruki; Munemoto, Takashi; Kubota, Mitsuru; Hayashida, Kazuki; Nakata, Kotaro*; Hasegawa, Takuma*

no journal, , 

no abstracts in English

Oral presentation

Distribution of rare earth elements between deep groundwater and fracture-filling calcite at the Mizunami Underground Research Laboratory

Munemoto, Takashi; Iwatsuki, Teruki; Kato, Toshihiro; Kubota, Mitsuru; Hayashida, Kazuki

no journal, , 

no abstracts in English

Oral presentation

Colloidal solutes transport processes in deep groundwater

Iwatsuki, Teruki; Kubota, Mitsuru; Hayashida, Kazuki; Kato, Toshihiro

no journal, , 

We studied colloidal solutes transport in deep groundwater at depths of 500 m in Mizunami Underground Research Laboratory. Colloidal phases consist of silicate minerals, calcite, iron-hydroxides were observed in groundwater. Those particles possibly transport 10-80 % of metal elements and rare earth elements. In the closed drift, colloidal phases consist of biofilms, ZnS were observed. Since the concentration of rare earth elements are considerably low, rare earth elements with solute and colloidal phases probably absorbed on cementing materials, clay materials in closed drift.

Oral presentation

Study on groundwater recovery experiment in Mizunami Underground Research Laboratory, 3; Conceptual modeling of fracture distribution around the underground gallery

Onoe, Hironori; Takayasu, Kentaro; Hayashida, Kazuki; Takeuchi, Ryuji; Iwatsuki, Teruki

no journal, , 

no abstracts in English

Oral presentation

Study on groundwater recovery experiment in Mizunami Underground Research Laboratory, 2; Changes in water chemistry associated with the water recovery around the closure test drift

Hayashida, Kazuki; Kato, Toshihiro; Kubota, Mitsuru; Onoe, Hironori; Iwatsuki, Teruki

no journal, , 

no abstracts in English

Oral presentation

Mizunami Underground Research Laboratory Project; Study on groundwater recovery experiment; Modeling of fracture distribution in the crystalline rock around the research gallery

Onoe, Hironori; Takayasu, Kentaro; Hayashida, Kazuki; Takeuchi, Ryuji; Iwatsuki, Teruki

no journal, , 

no abstracts in English

Oral presentation

Mizunami Underground Research Laboratory Project; Study on groundwater recovery experiment; Hydrochemical change of groundwater during the water filling of the research gallery

Kubota, Mitsuru; Hayashida, Kazuki; Kato, Toshihiro; Iwatsuki, Teruki

no journal, , 

This poster compiled Hydrochemical change of groundwater during the water filling of the research gallery.

Oral presentation

Geochemical analysis of groundwater chemistry after the drift closure in the granite

Hayashida, Kazuki; Kato, Toshihiro; Kubota, Mitsuru; Iwatsuki, Teruki

no journal, , 

This study aims to understand the hydrogeochemical condition and dominant process after the drift closure. To this aim the drift closure experiment was conducted in the granitic rock of 500 m below ground level of Mizunami Underground Research Laboratory. The groundwater chemistry such as major chemical component, pH and redox condition has been monitored in closed drift for 1 year. Dominant processes on chemical evolution of isolated groundwater in the closed drift were identified as follows; continuous replacement by surround rock water, microbial reduction, water-mineral interactions with evaporite, shotcrete and granite.

Oral presentation

Geochemical condition and solutes transport property around a closure tunnel

Iwatsuki, Teruki; Hayashida, Kazuki; Murakami, Hiroaki; Watanabe, Yusuke

no journal, , 

Geochemical condition and solutes transport property in and around a simulated closure tunnel were studied by observing the behavior of REEs at Mizunami Underground Research Laboratory. Results show that the REEs in the closure tunnel tend to be immobilized by absorbing to shotcrete and the colloidal flocculation.

Oral presentation

Change of hydrochemical environment and relating process caused by construction and closing of underground facility

Watanabe, Yusuke; Hayashida, Kazuki; Murakami, Hiroaki; Iwatsuki, Teruki

no journal, , 

In the geological disposal project of high-level radioactive waste, a disposal facility will be constructed in depths deeper than 300 m. In this study, the simulated experimental tunnel was constructed in the granite of 500 m depth at Mizunami Underground Research Laboratory, and the hydrochemical process after the tunnel closure was observed.

Oral presentation

Study of groundwater residence time in Mizunami Underground Research Laboratory

Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Hama, Katsuhiro; Iwatsuki, Teruki; Kato, Toshihiro*; Hayashida, Kazuki

no journal, , 

Groundwater dating using $$^{14}$$C, $$^{4}$$He, noble gas method was conducted in Mizunami Underground Research laboratory. The availability of degassing method for $$^{14}$$, flux estimation method for He were examined. It was identified that the groundwater have been derived in glacial age. The integration of distinct dating method is available to estimate precise age of groundwater.

Oral presentation

CRIEPI-JAEA collaboration study on mass transport by groundwater in and around the Mizunami Underground Research Laboratory

Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Hama, Katsuhiro; Iwatsuki, Teruki; Kato, Toshihiro*; Hayashida, Kazuki

no journal, , 

no abstracts in English

24 (Records 1-20 displayed on this page)