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Journal Articles

Reaction path analysis to sodium-water chemical reaction field using laser diagnostics

Tamura, Kenta*; Deguchi, Yoshihiro*; Muranaka, Ryota*; Kusano, koji*; Takata, Takashi*; Kikuchi, Shin; Kurihara, Akikazu

Proceedings of 24th International Symposium on Transport Phenomena (ISTP-24) (USB Flash Drive), 5 Pages, 2013/11

The purpose of this study aims to clarify the gas phase sodium-water reaction path and reaction products. The counter-flow diffusion experiment device is in the form of introducing the argon-based water vapor from the top of depressurized reaction chamber to the liquid sodium pool. Na, Na$$_{2}$$, H$$_{2}$$O, and reaction products in the counter-flow sodium-water reaction field were measured using laser diagnostics. The temperature controlled device was also improved to reduce the condensation of Na in the reaction zone for the better measurement performance. The main product in the sodium-water reaction was determined to be NaOH from the experimental results and its reaction path was discussed using Na-H$$_{2}$$O elementary reaction analysis.

Journal Articles

Grouting experiment with colloidal silica at 300 m depth of the Mizunami URL

Kobayashi, Shinji*; Nobuto, Jun*; Sugiyama, Hirokazu*; Kusano, Takashi*; Tsuji, Masakuni*; Mikake, Shinichiro; Matsui, Hiroya

Proceedings of European Rock Mechanics Symposium (EUROCK 2012) (CD-ROM), 13 Pages, 2012/05

JAEA (Japan Atomic Energy Agency) has been conducting geoscientific research and development at underground research laboratory under construction, in crystalline rock at Mizunami, Gifu. Considering water treatment expense, the water inflow should be minimized. Although cement grout has been applied to reduce the inflow at 460 m depth at the MIU (Mizunami Underground Research Laboratory), water inflow through narrow fractures which cement grout cannot penetrate might be a problem at deeper underground. Colloidal silica grout, which is liquid-type grout, has high durability as well as good penetrability and is therefore tested at a depth of 300 m. The results indicated that liquid-type grout could sufficiently reduce the hydraulic conductivity of rock mass with less than 1 Lu. In the water pressure resistance test, the ultra-high-pressure packer was set in the pilot hole. The results indicated that liquid-type grout could keep sealing effect even under high water pressures over 9 MPa.

Journal Articles

Pre-excavation grouting with micro-fine cement below four hundreds meter depth

Ishii, Yoji; Mikake, Shinichiro; Kamiya, Akira; Watanabe, Kazuhiko; Nobuto, Jun*; Kusano, Takashi*

Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.185 - 190, 2011/01

The "Mizunami Underground Research Laboratory" has been carrying out scientific research in granite to establish the technological basis for high-level radioactive waste disposal. To get reliable information on the rock mass geology and hydrogeology and on the bedrock conditions, a pilot borehole investigation was carried out before sinking the Ventilation Shaft. A region with high hydraulic head and low hydraulic conductivity was intersected by the pilot borehole at around GL-400m during these investigations. To reduce water inflow during excavation, pre-excavation grouting with micro-fine cement was done in this region before sinking the ventilation shaft. Despite the high hydraulic head and the low hydraulic conductivity, effective reduction of water-inflow was achieved.

Journal Articles

Test execution of liquid-type grout at depth of 300m of Mizunami Underground Research Laboratory

Nobuto, Jun*; Tsuji, Masakuni*; Kusano, Takashi*; Mikake, Shinichiro; Kamiya, Akira; Ishii, Yoji

Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.179 - 184, 2011/01

At Mizunami Underground Research Laboratory, the water inflow should be minimized, considering water treatment expense. Although cement grout has been applied to reduce water inflow up to 460 m depth, water inflow through small fractures which cement grout cannot penetrate can not be neglected at deeper underground. Liquid-type grout which has high durability as well as good penetrability was therefore tested at the depth of 300 m. Test results indicated that liquid-type grout could sufficiently reduce hydraulic conductivity of rock mass with less than 1Lu, and could keep improvement effect even after applied water pressure of more than 9 MPa was applied.

Journal Articles

Gas yield and mechanical property of super insulator (polyimide and polyester) after $$gamma$$ ray irradiation

Teshigawara, Makoto; Kusano, Joichi; Morishita, Norio; Maekawa, Fujio; Kato, Takashi; Hosoyama, Kenji*; Hara, Kazufumi*; Kojima, Yuji*

Teion Kogaku, 41(3), p.99 - 104, 2006/03

Japanese intense spallation neutron source (JSNS) driven by 3 GeV protons with power of 1 MW is constructed under the joint project of Japan Atomic Energy Agency and High Energy Accelerator Research Organization. Supercritical hydrogen of around 20K with 2 MPa is selected as a neutron moderator material and cryogenic hydrogen transfer lines are constructed from the moderators to the refrigerator. Then, a super insulator (SI) is adopted to reduce heat load in the hydrogen transfer lines. We performed irradiation test of SI using $$^{60}$$Co $$gamma$$ ray to evaluate the irradiation effect. Two kinds of super insulator (polyimide and polyester) coated both sides by aluminum were irradiated. After $$gamma$$ ray irradiation, tensile test and gas yield measurement of super insulator were performed. Polyester based SI became brittle at about 10 MGy, on the other hand, polyimide based SI did not loss ductility so much even 80 MGy. Polyester based SI generated gas yield higher than that of polyimide based SI about one order of magnitude. We developed the gas analysis method by using a Q-mass and a mass-flow, providing to identify the unknown gas (i.e. H$$_{2}$$O) effectively compared to a gas chromatography method.

Journal Articles

Mechanical evaluation of Nb-SUS HIP bonded structure

Mukugi, Ken*; Murai, Takashi*; Kijima, Y.*; Ouchi, Nobuo; Kusano, Joichi; Mizumoto, Motoharu

KEK Proceedings 2000-23, p.55 - 56, 2001/02

no abstracts in English

Journal Articles

Present status of R&D for the superconducting proton linac at JAERI

Mizumoto, Motoharu; Kusano, Joichi; Hasegawa, Kazuo; Ouchi, Nobuo; Oguri, Hidetomo; Ichihara, Masahiro; Tomisawa, Tetsuo; Ito, Takashi; Chishiro, Etsuji*; Ikegami, Masanori*; et al.

KEK Proceedings 99-25, p.3 - 5, 2000/02

no abstracts in English

Journal Articles

Mechanical strength of superconducting cavities at RT and cryogenic temperature

Mukugi, Ken*; Murai, Takashi*; Ouchi, Nobuo; Kusano, Joichi; Mizumoto, Motoharu; Saito, Kenji*

Nihon Kikai Gakkai Kanto Shibu Ibaraki Koenkai (2000) Koen Rombunshu, 2 Pages, 2000/00

no abstracts in English

Journal Articles

JAERI neutron science project and proton accelerator development

Mizumoto, Motoharu; Kusano, Joichi; Hasegawa, Kazuo; Ouchi, Nobuo; Oguri, Hidetomo; Kinsho, Michikazu; Tomisawa, Tetsuo; Ito, Takashi; Chishiro, Etsuji*; Ikegami, Masanori*; et al.

Proc. of Int. Symp. on Environment-conscious Innovative Mater. Processing with Advanced Energy Sources, p.71 - 78, 1998/00

no abstracts in English

Oral presentation

Current status and future tasks of countermeasures for reducing water inflow at Mizunami Underground Laboratory

Kusano, Takashi*; Tamura, Hideyuki*; Yahagi, Ryoji*; Ushida, Kazuhito*; Nobuto, Jun*; Kuroda, Hidetaka; Hara, Masato; Takeuchi, Shinji; Matsui, Hiroya; Yamamoto, Masaru; et al.

no journal, , 

no abstracts in English

Oral presentation

Study on applicability of RMR to Toki granite and assessment of rock mass property

Nobuto, Jun*; Matsui, Hiroya; Mikake, Shinichiro; Kusano, Takashi*; Kuroda, Hidetaka*

no journal, , 

no abstracts in English

Oral presentation

In-tunnel spraying test of the low alkaline super shotcrete, 1; General

Kumasaka, Hiroo*; Kobayashi, Shinji*; Kosuga, Keiichi*; Okuyama, Yasuji*; Kusano, Takashi*; Kurita, Kazuaki*; Yamawaki, Hiroyuki; Sato, Toshinori

no journal, , 

Shotcreting is currently underway in the south research access tunnel 500 m underground at Mizunami Underground Research Laboratory. The use of the low alkaline super shotcrete spraying method, which makes it possible to obtain high strength and high stiffness quickly after spraying while minimizing an environmental impact, is being considered as a means of stabilizing an excavated rock surface whose condition is rapidly deteriorating. For the purpose of evaluating the applicability of the method to the shotcreting work currently in progress, a verification field test was conducted. This paper briefly reports on the test.

Oral presentation

In-tunnel spraying test of the low-alkaline super shotcrete, 2; Mixing test to choose concrete mix proportion

Iwasaki, Masahiro*; Murokawa, Takamitsu*; Kobayashi, Shinji*; Ishii, Takashi*; Kusano, Takashi*; Kurita, Kazuaki*; Yamawaki, Hiroyuki; Sato, Toshinori

no journal, , 

no abstracts in English

Oral presentation

In-tunnel spraying test of low-alkali quick setting shotcrete, 3; Shotcreting test, support performance verification test

Nakaya, Atsushi*; Tada, Hiroyuki*; Okuyama, Yasuji*; Iwasaki, Masahiro*; Kusano, Takashi*; Kubo, Yohei*; Yamawaki, Hiroyuki; Sato, Toshinori

no journal, , 

no abstracts in English

Oral presentation

Grouting technology applied at 500 m depth of the Mizunami Underground Research laboratory, 1; Grouting design based on pre-boring investigation

Kobayashi, Shinji*; Tsuji, Masakuni*; Kusano, Takashi*; Ukai, Takaki*; Mikake, Shinichiro; Sato, Toshinori

no journal, , 

no abstracts in English

Oral presentation

Grouting technology applied at 500 m depth of the Mizunami Underground Research laboratory, 2; Grouting results and efficacy evaluation

Tsuji, Masakuni*; Kobayashi, Shinji*; Kusano, Takashi*; Eguchi, Keita*; Mikake, Shinichiro; Sato, Toshinori

no journal, , 

no abstracts in English

Oral presentation

Clarification of sodium-water chemical reaction using laser diagnostics

Deguchi, Yoshihiro*; Tamura, Kenta*; Muranaka, Ryota*; Kusano, koji*; Takata, Takashi*; Kikuchi, Shin; Kurihara, Akikazu

no journal, , 

In a sodium-cooled fast reactor (SFR), liquid sodium is used as a heat transfer fluid because of its excellent heat transport capability. One of the design basis accidents of the SFR is the water leakage into the liquid sodium flow by a breach of heat transfer tubes in a steam generator. Therefore the study on sodium-water chemical reactions is of paramount importance for safety reasons. This study aims to clarify the sodium-water reaction mechanisms using laser diagnostics. The sodium-water, sodium-oxygen and sodium-hydrogen counter-flow reactions were measured using laser diagnostics such as Raman, absorption and photo-fragmentation spectroscopies. The measurement results show that the main product of the sodium-water reaction is NaOH. The sodium-water reaction rate is slower than that of the sodium-oxygen reaction and hydrogen does not react noticeably with sodium.

Oral presentation

Post-excavation grouting technology applied at 500 m depth of the Mizunami Underground Research laboratory, 1; Outline of grouting to reduce groundwater inflow

Mikake, Shinichiro; Sato, Toshinori; Ikeda, Koki; Watanabe, Kazuhiko; Kobayashi, Shinji*; Tsuji, Masakuni*; Kusano, Takashi*; Kurita, Kazuaki*

no journal, , 

no abstracts in English

Oral presentation

Post-excavation grouting technology applied at 500 m depth of the Mizunami Underground Research Laboratory, 3; Results of grouting

Mikake, Shinichiro; Sato, Toshinori; Kurita, Kazuaki*; Kusano, Takashi*; Tsuji, Masakuni*; Kobayashi, Shinji*

no journal, , 

no abstracts in English

Oral presentation

Mizunami Underground Research Laboratory Project, Development of Engineering Technology for Underground Construction; Results and Evaluation for Post-excavation Grouting

Mikake, Shinichiro; Ikeda, Koki; Watanabe, Kazuhiko; Shiba, Nobuyuki; Kadoguchi, Yoshiaki; Tsuji, Masakuni*; Kusano, Takashi*; Kurita, Kazuaki*

no journal, , 

no abstracts in English

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