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Journal Articles

Estimation of vibration characteristics of nuclear facilities based on seismic observation records

Yamakawa, Koki*; Saruta, Masaaki*; Moritani, Hiroshi*; Yamazaki, Hiroaki*; Nishida, Akemi; Kawata, Manabu; Iigaki, Kazuhiko

Proceedings of 28th International Conference on Nuclear Engineering; Nuclear Energy the Future Zero Carbon Power (ICONE 28) (Internet), 6 Pages, 2021/08

Several large-scale earthquakes have occurred, such as the Niigataken Chuetsu-oki Earthquake in 2007 and the 2011 off-the-Pacific coast of Tohoku Earthquake. Therefore, a three-dimensional (3D) finite element model to evaluate the local response of the reactor building is currently being developed for seismic response analysis. In order to refine the 3D finite element model, it is important to verify the correspondence to the seismic observation behaviors. In this study, the authors analyze the basic response characteristics, such as the natural frequencies and modes of the reactor building, and evaluate the effects of the amplitude of the seismic excitation on the response characteristics based on seismic observation records. This is done to clarify the behavior of a reactor building during earthquakes. These analyses will assist in quantitatively evaluating the correlation between the natural frequency of the building and the amplitude of the seismic excitation. Furthermore, the ratios of rotational displacement and displacement caused by building deformation for natural modes are discussed.

Journal Articles

Thick target neutron yield at 0 degree by 250 and 350 MeV protons

Iwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Nakamura, Takashi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Satoh, Daiki; Yashima, Hiroshi*; Yamakawa, Hiroshi*; et al.

Proceedings of 8th Specialists' Meeting on Shielding Aspects of Accelerators, Targets and Irradiation Facilities (SATIF-8), p.195 - 203, 2010/03

Neutron energy spectra at 0 degree produced from stopping-length thick graphite, aluminum, iron and lead targets bombarded by 250 MeV and 350 MeV protons were measured at the neutron TOF course at RCNP of Osaka University. The neutron energy spectra were obtained by using the time-of-flight technique in the energy range from 10 MeV to incident proton energy. To compare the experimental results, Monte Carlo calculations by the PHITS and MCNPX codes using the JENDL-HE and the LA150 evaluated nuclear data files were performed. It was found that these calculated results at 0-degree generally underestimated the experimental results for all targets in the energy range above 20 MeV.

JAEA Reports

Subsurface temperature in non-Quaternary volcanic regions in Japan

Yamakawa, Tadashi; Takeda, Seiji; Kimura, Hideo; Hyodo, Hiroshi*

JAEA-Research 2007-040, 21 Pages, 2007/03

JAEA-Research-2007-040.pdf:2.95MB

Radionuclide migration toward human society through geologic processes is to be assessed as part of safety assessments of geologic disposal for radioactive waste. A subsurface temperature in non-Quaternary volcanic regions was focused as one of the changes in this study. The study was conducted to extract features of subsurface temperature in non-Quaternary volcanic regions throughout Japan. After delineating Quaternary volcanic regions, features in non-Quaternary volcanic regions were studied in various aspects. The present study clarified that a relationship between subsurface temperature and its depth was expressed by an equation in non-Quaternary volcanic regions far from about 24 km of Quaternary volcanic centers. This led to about 16$$^{circ}$$C/km in general geothermal gradient in non-Quaternary volcanic areas, which was lower than 20$$^{circ}$$C/km of the previous study.

JAEA Reports

Boundary delineation for regional groundwater flow through Geographic Information System (Contract research)

Yamakawa, Tadashi; Munakata, Masahiro; Kimura, Hideo; Hyodo, Hiroshi*

JAEA-Research 2007-039, 26 Pages, 2007/03

JAEA-Research-2007-039.pdf:4.68MB

Radionuclide migration toward human society through geologic processes is to be assessed as part of long-term safety assessments of geologic disposal for radioactive waste. This study was conducted to develop methodologies of boundary delineation for regional groundwater flow system. Geographic Information System, GIS, was applied to Miyakoji in the Abukuma as an area of interest. The present study revealed that, taking the groundwater flows and fracture characteristics of the area into consideration, the groundwater flow system in Miyakoji drainage basin should be bounded by the Otakine mountain area and the northern part of Tokoha drainage basin, which occupies a larger area than understood before.

Journal Articles

Measurement of neutron production spectra at the forward direction from thick graphite, aluminum, iron and lead targets bombarded by 250 MeV protons

Iwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Nakamura, Takashi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Satoh, Daiki; Yashima, Hiroshi*; Yamakawa, Hiroshi*; et al.

JAEA-Conf 2006-009, p.118 - 123, 2006/11

Neutron energy spectra produced at the forward direction from thick graphite, aluminum, iron and lead targets bombarded by 250 MeV protons were measured by the TOF method at RCNP of Osaka University. The experimental data were compared with the calculated results of the PHITS, MCNPX codes. All calculations give lower neutron energy spectra than the experimental ones for all targets above 20 MeV and must be improved for neutron production at 0-degree. These experimental data will be useful as benchmark data for investigating the accuracy of the Monte Carlo simulation and for the shielding design of accelerator facilities.

Journal Articles

Measurement of neutron spectra produced in the forward direction from thick graphite, Al, Fe and Pb targets bombarded by 350 MeV protons

Iwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Nakamura, Takashi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Satoh, Daiki; Yashima, Hiroshi*; Yamakawa, Hiroshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 562(2), p.789 - 792, 2006/06

 Times Cited Count:6 Percentile:45.27(Instruments & Instrumentation)

Neutron energy spectra produced from thick targets play an important role in validation of calculation codes that are employed in the design of spallation neutron sources and the shielding design of accelerator facilities. However, appropriate experimental data were scarce in the forward direction for the incident energy higher than 100 MeV. In this study, neutron spectra at 0 degree from thick targets bombarded with 350 MeV protons were measured by the time-of-flight technique using an NE213. The targets used were graphite, Al, Fe and Pb and their thicknesses were chosen to be a little thicker than the stopping lengths. The experiment was carried out at the TOF course of the RCNP (Research Center of Nuclear Physics) ring cyclotron, Osaka University. The flight path length between center of the target and of an NE213 were 11.4 m for the measurement of low energy neutrons and 95 m for high energy neutrons. The experimental data are compared with the calculated results by using the Monte Carlo transport codes, such as MCNPX and PHITS codes.

Journal Articles

Comprehensive study on layout dependence of soft errors in CMOS latch circuits and its scaling trend for 65 nm technology node and beyond

Fukui, Hironobu*; Hamaguchi, Masafumi*; Yoshimura, Hisao*; Oyamatsu, Hisato*; Matsuoka, Fumitomo*; Noguchi, Tatsuo*; Hirao, Toshio; Abe, Hiroshi; Onoda, Shinobu; Yamakawa, Takeshi; et al.

Proceedings of 2005 Symposia on VLSI Technology and Circuits, p.222 - 223, 2005/00

no abstracts in English

Journal Articles

Charge collected in Si MOS capacitors and SOI devices p$$^{+}$$n diodes due to heavy ion irradiation

Hirao, Toshio; Laird, J. S.; Onoda, Shinobu; Shibata, Toshihiko*; Wakasa, Takeshi; Yamakawa, Takeshi; Abe, Hiroshi; Takahashi, Yoshihiro*; Onishi, Kazunori*; Ito, Hisayoshi

Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.105 - 109, 2004/10

no abstracts in English

Journal Articles

Time-resolved laser and ion microbeam studies of single event transients in high-speed optoelectronic devices

Laird, J. S.; Hirao, Toshio; Onoda, Shinobu; Wakasa, Takeshi; Yamakawa, Takeshi; Abe, Hiroshi; Kamiya, Tomihiro; Ito, Hisayoshi

Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.125 - 129, 2004/10

no abstracts in English

Journal Articles

Study on proton-induced single event upset in Sub-0.1$$mu$$m CMOS LSIs

Fukui, Hironobu*; Hamaguchi, Masafumi*; Yoshimura, Hisao*; Oyamatsu, Hisato*; Matsuoka, Fumitomo*; Noguchi, Tatsuo*; Hirao, Toshio; Abe, Hiroshi; Onoda, Shinobu; Yamakawa, Takeshi; et al.

Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.169 - 172, 2004/10

no abstracts in English

Journal Articles

Single event research at JAERI

Hirao, Toshio; Laird, J. S.; Mori, Hidenobu; Onoda, Shinobu; Wakasa, Takeshi; Yamakawa, Takeshi; Abe, Hiroshi; Ito, Hisayoshi

Proceedings of 5th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications, p.161 - 166, 2002/10

no abstracts in English

Journal Articles

X-ray diffuse scattering of quenched copper single crystals

Maeta, Hiroshi; Yamakawa, Koiji*; *; Haruna, K.*; Kato, Teruo; Ono, Fumihisa*

Nuclear Instruments and Methods in Physics Research B, 97, p.491 - 494, 1995/00

 Times Cited Count:0 Percentile:0.01(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Hydrogen migration in cold worked Pd around 50K

Yamakawa, Koiji*; Maeta, Hiroshi

Scr. Metall. Mater., 32(7), p.967 - 970, 1995/00

no abstracts in English

Journal Articles

Migration of hydrogen isotopes in Pd-Ni dilute alloys around 50K

Yamakawa, Koiji*; Maeta, Hiroshi

Scr. Metall. Mater., 31(7), p.803 - 808, 1994/00

no abstracts in English

Journal Articles

Hydrogen migration in Pd-H alloys at low temperatures

Maeta, Hiroshi; Yamakawa, Koiji*

Defect Diffus. Forum, 95-98, p.305 - 310, 1993/00

no abstracts in English

Oral presentation

Thick target neutron yield at 0 degree by 250 and 350 MeV protons

Iwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Nakamura, Takashi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Satoh, Daiki; Yashima, Hiroshi*; Yamakawa, Hiroshi*; et al.

no journal, , 

Neutron energy spectra at 0 degree produced from stopping-length thick graphite, aluminum, iron and lead targets bombarded by 250 MeV and 350 MeV protons were measured at the neutron TOF course at RCNP of Osaka University. The neutron energy spectra were obtained by using the time-of-flight technique in the energy range from 10 MeV to incident proton energy. To compare the experimental data, Monte Carlo calculations by PHITS and MCNPX codes using the JENDL-HE and the LA150 evaluated files were performed. It was found that these calculation results at 0-degree generally underestimated the experimental data for all targets in the energy range above 20 MeV.

Oral presentation

Structures of cluster plasmas and generations of energetic ions and X-rays

Fukuda, Yuji; Yamakawa, Koichi; Nishiyama, Hiroshi*; Masaki, Tomohiro*; Moribayashi, Kengo; Kishimoto, Yasuaki*

no journal, , 

no abstracts in English

Oral presentation

Spin nematic susceptibility studied by inelastic neutron scattering in FeSe

Shamoto, Shinichi; Kajimoto, Ryoichi; Ishikado, Motoyuki*; Yamakawa, Yoichi*; Watashige, Tatsuya*; Kasahara, Shigeru*; Nakamura, Mitsutaka; Kontani, Hiroshi*; Shibauchi, Takasada*; Matsuda, Yuji*

no journal, , 

no abstracts in English

Oral presentation

Estimation of vibration characteristics of nuclear facilities by analyzing earthquake observation records, 1; Analysis method

Nishida, Akemi; Kawata, Manabu; Iigaki, Kazuhiko; Yamakawa, Koki*; Saruta, Masaaki*; Moritani, Hiroshi*; Yamazaki, Hiroaki*

no journal, , 

no abstracts in English

Oral presentation

Estimation of vibration characteristics of nuclear facilities by analyzing earthquake observation records, 2; Analysis results

Yamakawa, Koki*; Saruta, Masaaki*; Moritani, Hiroshi*; Yamazaki, Hiroaki*; Nishida, Akemi; Kawata, Manabu; Iigaki, Kazuhiko

no journal, , 

no abstracts in English

20 (Records 1-20 displayed on this page)
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