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Nakamura, Takafumi*; Yamamoto, Yukio*; Arakawa, Masakazu*; Maruyama, Akio*; Yoshigoe, Akitaka
Sangyo Oyo Kogakukai Rombunshi, 11(2), p.109 - 114, 2023/09
Surface chemistry experimental end-station at BL23SU in SPring-8 is widely used to study various surfaces and interfaces of functional materials by means of soft X-rays synchrotron radiation. To analyze surface chemical reactions between gas and solid surfaces, an accurate control of flow-rates of gases is essential. This paper describes a computerized automatic gas flow control system to improve the accuracy and reproducibility of gas-surface reaction experiments in the pressure range of ultra-high vacuum (molecular flow) conditions. The system uses feedback control to operate the slow-leak valve to control the gas-pressure. As a result, the system achieved results equivalent to those of a skilled experimenter.
Hama, Katsuhiro; Sasao, Eiji; Iwatsuki, Teruki; Onoe, Hironori; Sato, Toshinori; Fujita, Tomoo; Sasamoto, Hiroshi; Matsuoka, Toshiyuki; Takeda, Masaki; Aoyagi, Kazuhei; et al.
JAEA-Review 2016-014, 274 Pages, 2016/08
JAEA-Review-2016-014.pdf:44.45MB
We synthesized the research results from the Mizunami/Horonobe Underground Research Laboratories (URLs) and geo-stability projects in the second midterm research phase. This report can be used as a technical basis for the Nuclear Waste Management Organization of Japan/Regulator at each decision point from siting to beginning of disposal (Principal Investigation to Detailed Investigation Phase).
Niwa, Masakazu; Takeuchi, Ryuji; Onoe, Hironori; Tsuyuguchi, Koji; Asamori, Koichi; Umeda, Koji; Sugihara, Kozo
Geochemistry, Geophysics, Geosystems (Internet), 13(5), p.Q05020_1 - Q05020_15, 2012/05
Times Cited Count：14 Percentile：39.4(Geochemistry & Geophysics)In the 2011 off the Pacific coast of Tohoku Earthquake, groundwater pressure changes were observed in and around the Mizunami Underground Research Laboratory (MIU). Coseismic changes of groundwater pressure are believed to correspond to crustal dilation/contraction induced by earthquakes. In this study we calculated volumetric strain changes due to the Tohoku Earthquake. The calculation indicates 2
10
of dilational strain around the MIU. The dilation corresponds to drawdowns of several tens of centimeters or more, and is almost the same as the drawdown observed in the boreholes at distances greater than 1 km from the MIU. In contrast, rapid elevation of groundwater pressures was observed in the boreholes within the 500 m vicinity of the MIU. The anomalous elevation is explained by a temporary recovery of the drawdown due to excavation of the shafts and a unique permeability increase induced by the coseismic dilation of impervious faults.
Sakai, Kenji; Sakamoto, Shinichi; Kinoshita, Hidetaka; Seki, Masakazu; Haga, Katsuhiro; Kogawa, Hiroyuki; Wakui, Takashi; Naoe, Takashi; Kasugai, Yoshimi; Tatsumoto, Hideki; et al.
JAEA-Technology 2011-039, 121 Pages, 2012/03
JAEA-Technology-2011-039.pdf:10.87MB
This report investigates the behavior, damage and restoration of a neutron source station of the MLF at the Great East Japan Earthquake and verified the safety design for emergency accidents in the neutron source station. In the MLF, after an occurrence of the Earthquake, strong quakes were detected at the instruments, the external power supply was lost, all of the circulators shut down automatically, and the hydrogen gas was released. The leakages of mercury, hydrogen and radio-activation gases did not occur. While, the quakes made gaps between the shield blocks and ruptured external pipe lines by subsidence around the building. But significant damages to the components were not found though the pressure drop of compressed air lines influenced on a target trolley lock system and so on. These results substantiated the validity of the safety design for emergency accidents in the source station, and suggested several points of improvement.
Sakai, Kenji; Futakawa, Masatoshi; Takada, Hiroshi; Sakamoto, Shinichi; Maekawa, Fujio; Kinoshita, Hidetaka; Seki, Masakazu; Haga, Katsuhiro; Kogawa, Hiroyuki; Wakui, Takashi; et al.
Proceedings of 20th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-20) (USB Flash Drive), 6 Pages, 2012/03
This report investigates behaviors and damages of each component in a neutron target station of the MLF at the J-PARC at the time of the Great East Japan Earthquake (GEJE). At the date of the GEJE, in the MLF, strong quakes were detected at several instruments, an external power supply were lost, all of the circulation systems were shut down automatically, and a hydrogen gas was released as planned. Leakage of activation liquids and gases did not occur. While, the quakes made gaps between shield blocks and ruptured external pipe lines for air and water by subsidence. But significant damages on the components of the target station were not found though a loss of compressed air supply affected lock systems with air cylinders and pneumatic operation values. These results substantiated a validity of safety design on the target station for emergency accidents.
Takenoshita, Yoshihisa*; Nagai, Junichi*; Nagatani, Takeshi*; Oe, Masakazu*; Hase, Yoshihiro; Tanaka, Atsushi; Narumi, Issei
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 69, 2011/01
no abstracts in English
Takenoshita, Yoshihisa*; Tojima, Futoshi*; Nishi, Hiroyuki*; Shirao, Tsukasa*; Nagatani, Takeshi*; Oe, Masakazu*; Hase, Yoshihiro; Narumi, Issei
JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 66, 2008/11
no abstracts in English
Tojima, Futoshi*; Takenoshita, Yoshihisa*; Shirao, Tsukasa*; Nagatani, Takeshi*; Oe, Masakazu*; Ueno, Keiichiro*; Hase, Yoshihiro; Tanaka, Atsushi
JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 73, 2008/03
no abstracts in English
Tojima, Futoshi*; Shirao, Tsukasa*; Ueno, Keiichiro*; Oe, Masakazu*; Yasuniwa, Makoto*; Hase, Yoshihiro; Tanaka, Atsushi
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 83, 2007/02
no abstracts in English
Tojima, Futoshi*; Yasuniwa, Makoto*; Shirao, Tsukasa*; Oe, Masakazu*; Ueno, Keiichiro*; Tanaka, Atsushi; Hase, Yoshihiro
no journal, ,
no abstracts in English
Tojima, Futoshi*; Takenoshita, Yoshihisa*; Nagatani, Takeshi*; Shirao, Tsukasa*; Oe, Masakazu*; Ueno, Keiichiro*; Tanaka, Atsushi; Hase, Yoshihiro
no journal, ,
no abstracts in English
Takenoshita, Yoshihisa*; Tojima, Futoshi*; Nishi, Hiroyuki*; Yoshihara, Ryohei; Hase, Yoshihiro; Shirao, Tsukasa*; Nagatani, Takeshi*; Oe, Masakazu*
no journal, ,
no abstracts in English
Takenoshita, Yoshihisa*; Nagatani, Takeshi*; Oe, Masakazu*; Nagai, Junichi*; Nishi, Hiroyuki*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei
no journal, ,
no abstracts in English
Niwa, Masakazu; Takeuchi, Ryuji; Onoe, Hironori; Asamori, Koichi; Umeda, Koji; Sugihara, Kozo
no journal, ,
Groundwater level changes associated with the 2011 off the Pacific coast of Tohoku Earthquake are observed in the almost boreholes in and around the MIU site. All boreholes arranged away from the MIU showed drawdown ranging from 1 to 5 m. It is consistent with the volumetric strain changes calculated from the fault models associated with the Tohoku earthquake. In contrast, groundwater levels were elevated up to 15 m in the boreholes localized in the vicinity of the MIU. Dilatation caused by an earthquake is possible to induce crack opening and subsequent permeability increase. This mechanism could cause the anomalous elevation of groundwater level within the MIU site, as a temporal recovery of continuously artificial drawdowned groundwater level.
Haga, Katsuhiro; Wakui, Takashi; Naoe, Takashi; Kogawa, Hiroyuki; Kinoshita, Hidetaka; Teshigawara, Makoto; Kasugai, Yoshimi; Seki, Masakazu; Hanano, Kohei; Suzuki, Toru; et al.
no journal, ,
Pitting damage of the target vessel wall is the crucial issue for the development of the high power mercury target. The damage is affected by the target vessel structure and the proton beam condition. In order to improve the evaluation accuracy of the pitting depth, the data of the pitting damage in the J-PARC mercury target was indispensable. Because the first target vessel of J-PARC was damaged by the earthquake, the preparations for cutting out specimens were carried out in advance. The surface dose rate is more than 10micro Sv/h. Then, we developed the cutting machine using hole saw, and we succeeded in cutting out specimens of the outer diameter of 50 mm. A spot which seems the cavitation damage was found by visual observation. The target replacement was also successfully finished. The radioactive gas release was more than the expectation, and it roused the necessity of reconsider the off-gas treatment system.
Tsuyuguchi, Koji; Onoe, Hironori; Niwa, Masakazu; Takeuchi, Ryuji; Karino, Tomoyuki
no journal, ,
In the 2011 off the Pacific coast of Tohoku Earthquake, groundwater pressure changes were observed around the Mizunami Underground Research Laboratory (MIU) in Tono area. It was confirmed that the tendency of the pressure change due to the earthquake is different according to relationship with the location of borehole and geological feature structure. This report shows the water pressure change observed in boreholes after the earthquake.
Kai, Tetsuya; Uchida, Toshitsugu; Kinoshita, Hidetaka; Seki, Masakazu; Ueno, Hideki; Haga, Katsuhiro; Kogawa, Hiroyuki; Wakui, Takashi; Naoe, Takashi; Takada, Hiroshi
no journal, ,
no abstracts in English
Niwa, Masakazu; Sanga, Tomoji*; Komatsu, Tetsuya; Onoe, Hironori; Matsuoka, Toshiyuki
no journal, ,
Numerical simulation of landform changes were performed for the reconstructed paleotopography at 450 ka. In this simulation, landform changes are described based on the algorism concerning sediment transport and deposition in rivers. Simulated topography showed a good agreement with present real topography. This suggests that the numerical simulation is usable to examine the validity of reconstructed paleotopography.
Onoe, Hironori; Matsuoka, Toshiyuki; Niwa, Masakazu; Takeda, Takaaki*
no journal, ,
no abstracts in English
