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Satoshi Fukada - One of the best experts on this subject based on the ideXlab platform.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Nuclear Materials and Energy, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Elsevier, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil. Keywords: Tritium safety, Natural soil, Tritiated wate
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Tritium sorption behavior on the percolation of Tritiated Water into a soil packed bed
Fusion Engineering and Design, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract Development of tritium transport model in natural soil is an important issue from a viewpoint of safety of fusion reactors. The spill of a large amount of Tritiated Water to the environment is a concern accident because huge Tritiated Water is handled in a fusion plant. In this work, a simple tritium transport model was proposed based on the tritium transport model in porous materials. The overall mass transfer coefficient representing isotope exchange reaction between Tritiated Water and structural Water in soil particles was obtained by numerically analyzing the result of the percolation experiment of Tritiated Water into the soil packed bed. Saturated hydraulic conductivity in the natural soil packed bed was obtained to be 0.033 mm/s. By using this value, the overall mass transfer capacity coefficients representing the isotope exchange reaction between Tritiated Water percolating through the packed bed and overall structural Water on soil particles was determined to be 6.0 × 10−4 1/s. This value is much smaller than the mass transfer capacity coefficient between Tritiated Water vapor and Water on concrete material and metals.
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Percolation behavior of Tritiated Water into a soil packed bed
Fusion Science and Technology, 2015Co-Authors: T. Honda, Kazunari Katayama, Toshiharu Takeishi, Keiichiro Uehara, Satoshi FukadaAbstract:AbstractA large amount of cooling Water is used in a D-T fusion reactor. The cooling Water will contain tritium with high concentration because tritium can permeate metal walls at high temperature easily. A development of tritium handling technology for confining Tritiated Water in the fusion facility is an important issue. In addition, it is also important to understand tritium behavior in environment assuming severe accidents. In this study, percolation experiments of Tritiated Water in soil packed bed were carried out and tritium behavior in soil was discussed.Six soil samples were collected in Hakozaki campus of Kyushu University. These particle densities were same degree as that of general soils and moisture contents were related to BET surface area. For two soil samples used in the percolation experiment of Tritiated Water, saturated hydraulic conductivity agreed well with the estimating value by Creager. Tritium retention ratio in the soil packed bed was larger than Water retention. This is conside...
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Tritium Desorption Behavior from Soil Exposed to Tritiated Water
Fusion Science and Technology, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:In this study, Tritiated Water was poured in a packed bed of natural soil and subsequently distilled Water was poured in the bed to recover tritium retained in the soil at room temperature. From tr...
Kazunari Katayama - One of the best experts on this subject based on the ideXlab platform.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Nuclear Materials and Energy, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Elsevier, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil. Keywords: Tritium safety, Natural soil, Tritiated wate
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Tritium sorption behavior on the percolation of Tritiated Water into a soil packed bed
Fusion Engineering and Design, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract Development of tritium transport model in natural soil is an important issue from a viewpoint of safety of fusion reactors. The spill of a large amount of Tritiated Water to the environment is a concern accident because huge Tritiated Water is handled in a fusion plant. In this work, a simple tritium transport model was proposed based on the tritium transport model in porous materials. The overall mass transfer coefficient representing isotope exchange reaction between Tritiated Water and structural Water in soil particles was obtained by numerically analyzing the result of the percolation experiment of Tritiated Water into the soil packed bed. Saturated hydraulic conductivity in the natural soil packed bed was obtained to be 0.033 mm/s. By using this value, the overall mass transfer capacity coefficients representing the isotope exchange reaction between Tritiated Water percolating through the packed bed and overall structural Water on soil particles was determined to be 6.0 × 10−4 1/s. This value is much smaller than the mass transfer capacity coefficient between Tritiated Water vapor and Water on concrete material and metals.
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Percolation behavior of Tritiated Water into a soil packed bed
Fusion Science and Technology, 2015Co-Authors: T. Honda, Kazunari Katayama, Toshiharu Takeishi, Keiichiro Uehara, Satoshi FukadaAbstract:AbstractA large amount of cooling Water is used in a D-T fusion reactor. The cooling Water will contain tritium with high concentration because tritium can permeate metal walls at high temperature easily. A development of tritium handling technology for confining Tritiated Water in the fusion facility is an important issue. In addition, it is also important to understand tritium behavior in environment assuming severe accidents. In this study, percolation experiments of Tritiated Water in soil packed bed were carried out and tritium behavior in soil was discussed.Six soil samples were collected in Hakozaki campus of Kyushu University. These particle densities were same degree as that of general soils and moisture contents were related to BET surface area. For two soil samples used in the percolation experiment of Tritiated Water, saturated hydraulic conductivity agreed well with the estimating value by Creager. Tritium retention ratio in the soil packed bed was larger than Water retention. This is conside...
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Tritium Desorption Behavior from Soil Exposed to Tritiated Water
Fusion Science and Technology, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:In this study, Tritiated Water was poured in a packed bed of natural soil and subsequently distilled Water was poured in the bed to recover tritium retained in the soil at room temperature. From tr...
Toshiharu Takeishi - One of the best experts on this subject based on the ideXlab platform.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Nuclear Materials and Energy, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Elsevier, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil. Keywords: Tritium safety, Natural soil, Tritiated wate
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Tritium sorption behavior on the percolation of Tritiated Water into a soil packed bed
Fusion Engineering and Design, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract Development of tritium transport model in natural soil is an important issue from a viewpoint of safety of fusion reactors. The spill of a large amount of Tritiated Water to the environment is a concern accident because huge Tritiated Water is handled in a fusion plant. In this work, a simple tritium transport model was proposed based on the tritium transport model in porous materials. The overall mass transfer coefficient representing isotope exchange reaction between Tritiated Water and structural Water in soil particles was obtained by numerically analyzing the result of the percolation experiment of Tritiated Water into the soil packed bed. Saturated hydraulic conductivity in the natural soil packed bed was obtained to be 0.033 mm/s. By using this value, the overall mass transfer capacity coefficients representing the isotope exchange reaction between Tritiated Water percolating through the packed bed and overall structural Water on soil particles was determined to be 6.0 × 10−4 1/s. This value is much smaller than the mass transfer capacity coefficient between Tritiated Water vapor and Water on concrete material and metals.
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Percolation behavior of Tritiated Water into a soil packed bed
Fusion Science and Technology, 2015Co-Authors: T. Honda, Kazunari Katayama, Toshiharu Takeishi, Keiichiro Uehara, Satoshi FukadaAbstract:AbstractA large amount of cooling Water is used in a D-T fusion reactor. The cooling Water will contain tritium with high concentration because tritium can permeate metal walls at high temperature easily. A development of tritium handling technology for confining Tritiated Water in the fusion facility is an important issue. In addition, it is also important to understand tritium behavior in environment assuming severe accidents. In this study, percolation experiments of Tritiated Water in soil packed bed were carried out and tritium behavior in soil was discussed.Six soil samples were collected in Hakozaki campus of Kyushu University. These particle densities were same degree as that of general soils and moisture contents were related to BET surface area. For two soil samples used in the percolation experiment of Tritiated Water, saturated hydraulic conductivity agreed well with the estimating value by Creager. Tritium retention ratio in the soil packed bed was larger than Water retention. This is conside...
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Tritium Desorption Behavior from Soil Exposed to Tritiated Water
Fusion Science and Technology, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:In this study, Tritiated Water was poured in a packed bed of natural soil and subsequently distilled Water was poured in the bed to recover tritium retained in the soil at room temperature. From tr...
Kazuya Furuichi - One of the best experts on this subject based on the ideXlab platform.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Nuclear Materials and Energy, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil.
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Comparison of release behavior of Water vapor and Tritiated Water vapor from natural soil by heating
Elsevier, 2018Co-Authors: Tatsuro Hyuga, Kazuya Furuichi, Kazunari Katayama, Toshiharu Takeishi, Satoshi FukadaAbstract:In a Water-cooled nuclear fusion power plant, a large amount of Tritiated Water will be handled. Assuming severe accidents including the release of Tritiated Water to the surrounding environment, it is important to understand the tritium behavior in natural soil. In this study, two samples of natural soil were collected from different places in the Hakozaki campus of Kyushu University and the release behavior of Water vapor and that of tritium by heating to 1000°C were separately investigated and compared. Three release peaks of Water vapor appeared at 120, 270 and 450°C for both samples. Also, three release peaks of tritium appeared at the approximately same temperature as Water vapor release from both samples of soil immersed in Tritiated Water. The chemical form of released tritium was mainly Tritiated Water vapor. These results suggest that tritium sorbed in soil during immersion in Tritiated Water exists with Water originally contained in the soil. The amount of tritium released from each sample soil by heating to 1000°C was estimated to be only about 15% of that expected to be sorbed in the soil. Tritium remaining in the soil after heating is presumed to be retained in structural Water stably present in clay minerals constituting natural soil. Keywords: Tritium safety, Natural soil, Tritiated wate
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Tritium sorption behavior on the percolation of Tritiated Water into a soil packed bed
Fusion Engineering and Design, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:Abstract Development of tritium transport model in natural soil is an important issue from a viewpoint of safety of fusion reactors. The spill of a large amount of Tritiated Water to the environment is a concern accident because huge Tritiated Water is handled in a fusion plant. In this work, a simple tritium transport model was proposed based on the tritium transport model in porous materials. The overall mass transfer coefficient representing isotope exchange reaction between Tritiated Water and structural Water in soil particles was obtained by numerically analyzing the result of the percolation experiment of Tritiated Water into the soil packed bed. Saturated hydraulic conductivity in the natural soil packed bed was obtained to be 0.033 mm/s. By using this value, the overall mass transfer capacity coefficients representing the isotope exchange reaction between Tritiated Water percolating through the packed bed and overall structural Water on soil particles was determined to be 6.0 × 10−4 1/s. This value is much smaller than the mass transfer capacity coefficient between Tritiated Water vapor and Water on concrete material and metals.
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Tritium Desorption Behavior from Soil Exposed to Tritiated Water
Fusion Science and Technology, 2015Co-Authors: Kazuya Furuichi, Kazunari Katayama, Hiroyuki Date, Toshiharu Takeishi, Satoshi FukadaAbstract:In this study, Tritiated Water was poured in a packed bed of natural soil and subsequently distilled Water was poured in the bed to recover tritium retained in the soil at room temperature. From tr...
J P Ollivier - One of the best experts on this subject based on the ideXlab platform.
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innovative study of non steady state Tritiated Water diffusion test
Cement and Concrete Research, 2007Co-Authors: F Nugue, M P Yssorchecubaynes, J P OllivierAbstract:Abstract The objective of this paper is to propose a new method for testing molecular diffusion in saturated cement materials. A saturated specimen of porous materials was placed between two compartments; the upstream compartment contained Tritiated Water (HTO) and the downstream compartment a solution without HTO. The activity gradient between the compartments induced a flux of Tritiated Water through the sample. Usually, the flux of HTO is repeatedly measured by analysing the content of the downstream cell in the steady state. In this work, a theoretical study based on Fick's laws is used to show that it is possible to determine the diffusion coefficient D Fick1 by considering only two measurements obtained in the non-steady state, in the downstream compartment of a diffusion cell. A significant saving of time (approximately half) can be obtained. An experimental study of this innovative method is presented.
