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Sato, Shin*; Ono, Hirokazu; Tanai, Kenji; Yamamoto, Shuichi*; Fukaya, Masaaki*; Shimura, Tomoyuki*; Niunoya, Sumio*
Jiban Kogaku Janaru (Internet), 15(3), p.529 - 541, 2020/09
no abstracts in English
Nakatani, Takayoshi; Ishitoya, Kimihide; Funabashi, Hideyuki; Sugaya, Toshikatsu; Sone, Tomoyuki; Shimada, Hidemitsu*; Nakai, Kunihiro*
JAEA-Research 2009-064, 104 Pages, 2010/03
JAEA-Research-2009-064.pdf:14.45MB
The purpose of this study was to assess exposure dose of "Inadvertent Human Intrusion or Rare Natural Event Scenarios" on sub-surface disposal. It was one of "Classification of three types scenarios" in "Basic Policy for Safety Regulation Concerning Land Disposal of Low-Level Radioactive Waste (Interim Report)" formulated by the Nuclear Safety Commission of Japan. Selection of the assessed scenarios, development of the assessment tool and preliminary exposure dose assessment were conducted. Exposure dose of "Well water drinking scenario" was the highest in the assessed scenarios. This scenario assumed that the groundwater in Excavation Disturbed Zone (EDZ) was directly used as drinking water without any dilution. Although this was very conservative condition and the result exceeded 10 mSv/y, it was under the upper limit of standard dose value (10
100 mSv/y) in the Interim Report for "Inadvertent Human Intrusion or Rare Natural Event Scenarios".
Sugaya, Toshikatsu; Sone, Tomoyuki; Nakatani, Takayoshi; Ishitoya, Kimihide; Funabashi, Hideyuki; Sasaki, Ryoichi*; Shimoda, Satoko*; Kurosawa, Mitsuru*
JAEA-Research 2009-063, 80 Pages, 2010/03
JAEA-Research-2009-063.pdf:8.35MB
The purpose of this study was to assess exposure dose of "Likely Scenarios" and "Less-likely Scenarios" on sub-surface disposal. They were two of "Classification of three types scenarios" in "Basic Policy for Safety Regulation Concerning Land Disposal of Low-Level Radioactive Waste (Interim Report)" formulated by the Nuclear Safety Commission of Japan. Selection of the assessed scenarios, development of the assessment tool and preliminary exposure dose assessment were conducted. Maximum exposure doses for "Likely Scenarios" and "Less-likely Scenarios" were less than each standard dose value in the Interim Report (Likely Scenarios: 10
Sv/y, Less-likely Scenarios: 300Sv/y).
Ebisawa, Hiroyuki; Hanakawa, Hiroki; Asano, Norikazu; Kusunoki, Hidehiko; Yanai, Tomohiro; Sato, Shinichi; Miyauchi, Masaru; Oto, Tsutomu; Kimura, Tadashi; Kawamata, Takanori; et al.
JAEA-Technology 2009-030, 165 Pages, 2009/07
JAEA-Technology-2009-030.pdf:69.18MB
The condition of facilities and machinery used continuously were investigated before the renewal work of JMTR on FY 2007. The subjects of investigation were reactor building, primary cooling system tanks, secondary cooling system piping and tower, emergency generator and so on. As the result, it was confirmed that some facilities and machinery were necessary to repair and others were used continuously for long term by maintaining on the long-term maintenance plan. JMTR is planed to renew by the result of this investigation.
Oya, Tomoyuki*; Rai, Hiroki*; Tanoi, Keitaro*; Iikura, Hiroshi; Nakanishi, Tomoko*
Radioisotopes, 56(11), p.729 - 736, 2007/11
To study the effect of rhizosphere pH on the cadmium(Cd) uptake, soybean seedlings were grown for 4 days in 0.2 mM CaCl
solution containing 1 M Cd under pH 4.5 or pH 6.5 using 
Cd as a tracer. The concentration of Cd in root at pH 6.5 was 3.4 times higher than that at pH 4.5. Cadmium amount absorbed on root surface at pH 6.5 was 1.3 times higher than that at pH 4.5. With high accumulation of Cd in root, Cd toxicity such as brownish of the tissue and the suppression of lateral root development was only observed under pH 6.5 condition. Transpiration rate was found to have no relation to high accumulation of Cd in shoot.
Maezawa, Hiroshi*; Furusawa, Yoshiya*; Kobayashi, Katsumi*; Hieda, Kotaro*; Suzuki, Masao*; Usami, Noriko*; Yokoya, Akinari; Mori, Tomoyuki*
Acta Oncologica, 35(7), p.889 - 894, 1997/01
Times Cited Count：7 Percentile：22.9(Oncology)no abstracts in English
Nakatani, Takayoshi; Sugaya, Toshikatsu; Sone, Tomoyuki; Ishitoya, Kimihide; Funabashi, Hideyuki; Sasaki, Ryoichi*; Shimoda, Satoko*; Kurosawa, Mitsuru*
no journal, ,
The propose of study was safety assessment of "Likely scenarios" and "Less-likely scenarios" on sub-surface disposal. They were two of "Classification of three types scenarios" in "Basic Policy for Safety Regulation Concerning Land Disposal of Low-Level Radioactive Waste (Interim Report)" formulated by the NSC. Selection of the assessed scenarios, development of the assessment tool and preliminary exposure dose assessment were conducted according to the standard of the AESJ. As the results, Maximum exposure doses for "Likely Scenarios" and "Less-Likely Scenarios" were less than each standard dose value in the Interim Report (Likely Scenarios: 10Sv/y, Less-Likely Scenarios: 300Sv/y).
Sugaya, Toshikatsu; Nakatani, Takayoshi; Sone, Tomoyuki; Ishitoya, Kimihide; Funabashi, Hideyuki; Nakai, Kunihiro*; Shimada, Hidemitsu*
no journal, ,
The purpose of this study was safety assessment of "Inadvertent Human Intrusion or Rare Natural Event Scenarios" on sub-surface disposal. It was one of "Classification of three types scenarios" in "Basic Policy for Safety Regulation Concerning Land Disposal of Low-Level Radioactive Waste (Interim Report)" formulated by the NSC. Considering of assessed scenario, selection of the assessed scenarios, development of the assessment tool and preliminary exposure dose assessment were conducted according to the standard of the AESJ. As the results, exposure dose of "Well water drinking scenario" was the highest in the assessment scenarios. This scenario assumed that the groundwater in Excavation Disturbed Zone (EDZ) was directly used as drinking water without any dilution. Although, this was very conservative condition and the result exceeded 10 mSv/y, it stayed under the upper limit of standard dose value for "Inadvertent Human Intrusion or Rare Natural Event Scenarios" (10-100 mSv/y).
Hosoya, Shinichi*; Ishii, Eiichi; Hishiya, Tomoyuki*
no journal, ,
no abstracts in English
Sato, Shin*; Yamamoto, Shuichi*; Ono, Hirokazu; Tanai, Kenji; Fukaya, Masaaki*; Shimura, Tomoyuki*; Niunoya, Sumio*
no journal, ,
no abstracts in English
Sato, Shin*; Ono, Hirokazu; Tanai, Kenji; Yamamoto, Shuichi*; Fukaya, Masaaki*; Shimura, Tomoyuki*; Niunoya, Sumio*
no journal, ,
Kimura, Shun; Nakayama, Masashi; Kinota, Kimihiro; Tanai, Kenji; Niunoya, Sumio*; Shimura, Tomoyuki*; Fukaya, Masaaki*
no journal, ,
Swelling deformation of buffer material has been measured using buffer material swelling sensor on the full-scale in-situ engineered barrier system experiment. The sensor consists of strain gauges and is installed between the buffer material and backfill. This study reports the calculation result of the swelling deformation from measured strain values.
Kimura, Shun; Kinota, Kimihiro; Sugita, Yutaka; Moriiwa, Motoki*; Niunoya, Sumio*; Takahashi, Shinichi*; Shimura, Tomoyuki*
no journal, ,
In vertically emplaced Engineered Barrier System (EBS), the upwards swelling of the buffer material in the disposal pit can decrease its dry density. Consequently, a disposal tunnel above the disposal pits is backfilled to restrict the upwards swelling of the buffer material. In order to evaluate the performance of backfill material, it is essential to understand the swelling behavior of the buffer material due to the mechanical interactions between the buffer and backfill materials. To this end, laboratory experiments that simulate the buffer and the backfill materials of the vertically emplaced EBS were conducted.
