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Journal Articles

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Nagata, Takemitsu

Saikuru Kiko Giho, (28), p.80 - 84, 2005/09

no abstracts in English

Journal Articles

None

Nagata, Takemitsu

Saikuru Kiko Giho, (28), p.70 - 72, 2005/09

no abstracts in English

Journal Articles

None

Ijima, Takashi; Irie, Tsutomu

Saikuru Kiko Giho, (28), p.67 - 69, 2005/09

ACROSS (Accurately Controlled Routinely Operated Signal System) is a method to investigate any change of physical state in the Earth's interior using accurately controlled seismic ans/or electromagnetic sources. We preliminary obtained Pg, Sg, and possible plate boundary reflected PxP phase using one-moth long stacking data up to nearly 70 km distance. The seismic reflection experiment across the central Japan revealed the strong PxP reflection phase from 30-40 km deep of the Philippine Sea Plate boundary around the Tokai Region, Japan (Iidaka et al., 2003). The same seismic exploration line crossed the area where many active faults distribute. One of the big issues for revealing the loading process for active faults is to examine the process in the lower crust around active faults. To examine the seismic exploration records obtained by Iidaka et al. (2003), we noticed the presence of strong phases, which can be explained as PxP reflection from the plane at 20 km deep around the Atera fault, which is one of the most active faults in Japan. The phases are identified by a number of explosions on the survey line from north to south of this region. One of high possibilities for the 20km reflector is the detachment in the lower crust. The high velocity contrast can explain such PxP reflection phase. We evaluated the possibility to observe such phase by the ACROSS transmission from the present source located in Toki city and may conclude to be able to observe such phase and its temporal change, if the seismometers are placed 50-100km distance north of this region. We also generated synthetic seismograms to confirm the detection. In addition to seismic ACROSS, electrometric ACROSS method may identify the strong-reflection source and its temporal change using resistively analysis around the Tokai Region, Japan. This approach can give high possibility to watch the change of physical state beneath the active faults and it may contribute for the earthquake forecasting.

Journal Articles

None

Irie, Tsutomu

Saikuru Kiko Giho, (28), p.89 - 92, 2005/09

ACROSS (Accurately Controlled Routinely Operated Signal System) is a method to investigate any change of physical state in the Earth's interior using accurately controlled seismic ans/or electromagnetic sources. We preliminary obtained Pg, Sg, and possible plate boundary reflected PxP phase using one-moth long stacking data up to nearly 70 km distance. The seismic reflection experiment across the central Japan revealed the strong PxP reflection phase from 30-40 km deep of the Philippine Sea Plate boundary around the Tokai Region, Japan (Iidaka et al., 2003). The same seismic exploration line crossed the area where many active faults distribute. One of the big issues for revealing the loading process for active faults is to examine the process in the lower crust around active faults. To examine the seismic exploration records obtained by Iidaka et al. (2003), we noticed the presence of strong phases, which can be explained as PxP reflection from the plane at 20 km deep around the Atera fault, which is one of the most active faults in Japan. The phases are identified by a number of explosions on the survey line from north to south of this region. One of high possibilities for the 20km reflector is the detachment in the lower crust. The high velocity contrast can explain such PxP reflection phase. We evaluated the possibility to observe such phase by the ACROSS transmission from the present source located in Toki city and may conclude to be able to observe such phase and its temporal change, if the seismometers are placed 50-100km distance north of this region. We also generated synthetic seismograms to confirm the detection. In addition to seismic ACROSS, electrometric ACROSS method may identify the strong-reflection source and its temporal change using resistively analysis around the Tokai Region, Japan. This approach can give high possibility to watch the change of physical state beneath the active faults and it may contribute for the earthquake forecasting.

Journal Articles

Current status of the Horonobe Underground Research Laboratory Project

Nakayama, Masashi

Saikuru Kiko Giho, (28), p.1 - 8, 2005/09

05-2005-0017.pdf:1.99MB

Horonobe Underground Research Center has been conducting the Horonobe URL project since 2000. The technical aims of the project are presenting concrete geological environment as an example of sedimentary formation in Japan and confirming reliability of technologies for geological disposal of high level radioactive waste by applying them to actual geological condition of sedimentary formation. Meanwhile, the social aim is providing opportunities for general public to experience the actual deep underground circumstance and research and development activities to conducted there. Research and development activities are planned over three phases that will span a total duration of about 20 years: the 1st surface-based investigation phase, the 2nd URL construction phase and the 3rd operation phase. This report presents the outline of the project and the results of the investigations of 1st phase from 2000 to 2004.

Journal Articles

Environmental research and development

Ishihara, kaoru

Saikuru Kiko Giho, (28), p.112 - 116, 2005/09

Decommissioning technology development (construction of abolition measures of smelting conversion facilities, abolition measures of uranium enrichment facilities, and dismantlement engineering system) and mine mark measures.

Journal Articles

Effluent monitoring of low level liquid wastes from Tokai Reprocessing Plant

Mizutani, Tomoko; Miyagawa. Naoto; Takeishi, Minoru

Saikuru Kiko Giho, (28), p.21 - 25, 2005/09

We carried out reflection seismic and multi-offset VSP surveys at JNC Shobasama-site to develop the investigation technique in the granite area, and evaluated the applicability of these geophysical methods.As the result of this study, we consider that a) It is possible to infer the existence of the lower angle fracture zone in the granite by reflection seismic survey and b) Multi-offset VSP supplements the result of reflection seismic survey and it is possible to infer the distribution of the fracture zone in deeper area in the granite.

Journal Articles

Current status of system development to provide the databases of nuclides migration

Sasamoto, Hiroshi; Yoshida, Yasushi*; Isogai, Takeshi*; Suyama, Tadahiro*; Jintoku, Takashi*; Shibata, Masahiro; Yui, Mikazu

Saikuru Kiko Giho, (28), p.27 - 33, 2005/09

JNC has developed the databases of nuclides migration for safety assessment of high-level radioactive waste (HLW), and the databases have been used in the second progress report to present the technical reliability of HLW geological disposal in Japan. The technical level and applicability of databases developed by JNC have been evaluated highly not only in Japan but also in overseas. Thus we have performed the followings in order to provide the databases broadly in the word and to promote the use of databases; 1) development of tools to convert the database format from geochemical code PHREEQE to PHREEQC, GWB and EQ3/6, 2) open the web site including the databases to the public. As a result, a down-load system of databases from web site has been applied and the database users have significantly increased. Additionally it has been performed that we consider the useful comments from database user for modification and/or update of databases.

Journal Articles

Study on evaluation method for potential effect of natural phenomena on a HLW disposal system

Kawamura, Makoto; Makino, Hitoshi; Umeda, Koji; Seo, Toshihiro; Ishimaru, Tsuneari; Osawa, Hideaki

Saikuru Kiko Giho, (28), p.53 - 64, 2005/09

Evaluation for potential effect of natural phenomena on a HLW disposal system is an important issue in safety assessment. A scenario construction method for the effects on a HLW disposal system condition and performance has been developed for two purposes, first one is effective elicitation and organization of information from investigators of natural phenomena and performance assessor, the other is maintenance of traceability of scenario construction processes with suitable records. In this method, a series of works to construct scenarios is divided into pieces to facilitate to elicit the features of potential effect of natural phenomena on a HLW disposal system and is organized to create reasonable scenarios with consistency, traceability and adequate conservativeness within realistic view.

Journal Articles

Developments of the vitrification technology at TVF

Kozaka, Tetsuo; Tominaga, Setsuo

Saikuru Kiko Giho, (28), p.35 - 39, 2005/09

The exchange project of the TVF improvement melter began in 2002, and ended in September, 2004. Operation of the TVF improvement melter began in October, 2004, and produced 60 vitrified wastes by May, 2005. It was confirmed that the operation method and vitrification performance of TVF improvement melter was good.

Journal Articles

Development of criticality accident detector measuring neutrons and gamma-rays

Tsujimura, Norio; Yoshida, tadayoshi; Ishii, Masato*

Saikuru Kiko Giho, (28), p.65 - 66, 2005/09

None

Journal Articles

Fabrication technology for MOX fuel containing AmO$$_{2}$$ by an in-cell remote process

Yoshimochi, Hiroshi; Ishi, Yohei; Seki, Takayuki*; Mondo, Kenji; Sekine, Shinichi*; Koyama, Shinichi

Saikuru Kiko Giho, (28), p.9 - 20, 2005/09

An in-cell remote fabrication technique has been developed for MOX fuel pellets containing 3 and 5% americium (Am-MOX) at the Alpha-gamma Facility (AGF) in O-arai Engineering Center. A series of fuel pellet and the pin fabrication apparatuses were systematically installed in hot cell to make fabrication flow easier. After cold run and some modifications, they were remotely controlled from a panel in the operation room outside the hot cell as much as possible. From a preliminary UO2 pellet test and consequently plutonium pellet fabrication run, actual range of ball milling time, pressing and sintering condition were focused for Am-MOX pellet fabrication. As the next step, moisturized atmosphere was found out to remove the heterogeneity structure of 5% Am-MOX pellet. Finally, we established an optimized fabrication condition of 5% Am-MOX pellet sintered at 1700$$^{circ}$$C for 3h in an atmosphere of 5% H2-95% Ar with total moisture of 2000 ppm. Moreover it is important that the atmosphere has to be changed to dry gas at 800$$^{circ}$$C during cool down.

Journal Articles

None

Nagata, Takemitsu

Saikuru Kiko Giho, (28), p.95 - 98, 2005/09

ACROSS (Accurately Controlled Routinely Operated Signal System) is a method to investigate any change of physical state in the Earth's interior using accurately controlled seismic ans/or electromagnetic sources. We preliminary obtained Pg, Sg, and possible plate boundary reflected PxP phase using one-moth long stacking data up to nearly 70 km distance. The seismic reflection experiment across the central Japan revealed the strong PxP reflection phase from 30-40 km deep of the Philippine Sea Plate boundary around the Tokai Region, Japan (Iidaka et al., 2003). The same seismic exploration line crossed the area where many active faults distribute. One of the big issues for revealing the loading process for active faults is to examine the process in the lower crust around active faults. To examine the seismic exploration records obtained by Iidaka et al. (2003), we noticed the presence of strong phases, which can be explained as PxP reflection from the plane at 20 km deep around the Atera fault, which is one of the most active faults in Japan. The phases are identified by a number of explosions on the survey line from north to south of this region. One of high possibilities for the 20km reflector is the detachment in the lower crust. The high velocity contrast can explain such PxP reflection phase. We evaluated the possibility to observe such phase by the ACROSS transmission from the present source located in Toki city and may conclude to be able to observe such phase and its temporal change, if the seismometers are placed 50-100km distance north of this region. We also generated synthetic seismograms to confirm the detection. In addition to seismic ACROSS, electrometric ACROSS method may identify the strong-reflection source and its temporal change using resistively analysis around the Tokai Region, Japan. This approach can give high possibility to watch the change of physical state beneath the active faults and it may contribute for the earthquake forecasting.

Journal Articles

None

Irie, Tsutomu

Saikuru Kiko Giho, (27), p.73 - 76, 2005/06

We carried out reflection seismic and multi-offset VSP surveys at JNC Shobasama-site to develop the investigation technique in the granite area, and evaluated the applicability of these geophysical methods.As the result of this study, we consider that a) It is possible to infer the existence of the lower angle fracture zone in the granite by reflection seismic survey and b) Multi-offset VSP supplements the result of reflection seismic survey and it is possible to infer the distribution of the fracture zone in deeper area in he granite.

Journal Articles

Design and manufacture of "Resolution device of organic solution by super critical water (ROSE)", and preliminary examination

Hinoshita, Kenichi; Odakura, Makoto; Ouchi, Yuji*

Saikuru Kiko Giho, (27), p.17 - 22, 2005/06

Resolution device of Organic solution by Super critical water, given a name of ROSE, has been manufactured and installed in the QUALITY facility in JNC Tokai Works. This device can convert organic solutions containing radioactive nuclides, such as spent liquid scintillators, to inorganic ones. The results of preliminary examination suggest that more than 99.9% of organic carbons in a liquid scintillators can be converted to inorganic ones. Besides, recovered solutions contain less than 10 mg/l as COD or TOC. This report outlines the feature of ROSE set up in a glove box and the examination results of resolving simulated liquid scintillator

Journal Articles

None

Motohashi, Masahiro; Kyue, Tadashi; Imamoto, Nobuo; Ichinosawa, Hitoshi; Inanobe, Kazuhide*

Saikuru Kiko Giho, (27), p.96 - 97, 2005/06

The general-condition report of LWTF is carried to

Journal Articles

Development of neutron fields for performance testing of neutron dose equivalent rate meters

Tsujimura, Norio; Yoshida, Tadayoshi; Takada, Chie

Saikuru Kiko Giho, (27), p.55 - 57, 2005/06

None

Journal Articles

Experimental study on thermal hydraulics in high cycle thermal fatigue; Temperature fluctuation in mixing tee and parallel triple jets along wall

Kamide, Hideki; Igarashi, Minoru; Kimura, Nobuyuki; Hayashi, Kenji

Saikuru Kiko Giho, (27), p.41 - 53, 2005/06

When temperature fluctuation in fluid is transferred to the structure, it induces thermal load via thermal expansion of the structure. If the fluid temperature fluctuation amplitude and then thermal stress are large, structural integrity might be lost due to high cycle thermal fatigue, i.e., thermal striping. Water experiments were carried out for thermal hydraulic aspects of the thermal striping. A mixing tee and a triple-parallel jet along wall were selected as the test geometry. Detailed temperature and velocity fields were measured by movable thermocouple trees and particle image velocimetry. The power spectrum density (PSD) of temperature fluctuation could be estimated by a universal line, which is normalized by St number, when the flow velocity ratio and flow pattern was identical. Comparison of frequency characteristics between the temperature and velocity showed that the temperature fluctuation in the mixing tee was caused by Karman vortex behind the jet exiting from the branch pipe in case of wall jet condition.

Journal Articles

None

Kawada, Koji

Saikuru Kiko Giho, (27), p.80 - 83, 2005/06

We carried out reflection seismic and multi-offset VSP surveys at JNC Shobasama-site to develop the investigation technique in the granite area, and evaluated the applicability of these geophysical methods. As the result of this study, we consider that a) It is possible to infer the existence of the lower angle fracture zone in the granite by reflection seismic survey and b) Multi-offset VSP supplements the result of reflection seismic survey and it is possible to infer the distribution of the fracture zone in deeper area in the granite.

Journal Articles

Rock mechanical investigations in the Mizunami Underground Research Laboratory Project (Phase I)

Nakama, Shigeo; Yamada, Atsuo; Aoki, Toshiro; Sato, Toshinori

Saikuru Kiko Giho, (26), p.77 - 86, 2005/03

Focusing on the cover layer materials (as the Radon Barrier Materials), which could have the effect to restrain the radon from scattering into the air and the effect of the radiation shielding, we produced the radon barrier materials with crude bentonite on an experimental basis, using the rotary type comprehensive unit for grinding and mixing, through which we carried out the evaluation of the characteristics thereof.

498 (Records 1-20 displayed on this page)