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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

Development of advanced reprocessing system based on precipitation method using pyrrolidone derivatives as precipitants; Overall evaluation of system

Ikeda, Yasuhisa*; Kawasaki, Takeshi*; Harada, Masayuki*; Nogami, Masanobu*; Kawata, Yoshihisa*; Kim, S.-Y.*; Morita, Yasuji; Chikazawa, Takahiro*; Someya, Hiroshi*; Kikuchi, Toshiaki*

Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 5 Pages, 2011/12

An advanced reprocessing system for spent FBR fuels based on two precipitation processes using pyrrolidone derivatives as precipitants has been developed. Experimental results of precipitation behavior of U, Pu and other elements, the heat- and radiation-resistance of precipitants, the thermal decomposition properties of precipitates showed that N-n-butyl-2-pyrrolidone and N-neopentyl-2-pyrrolidone are the appropriate precipitants for the first and second precipitation steps, respectively. From the engineering investigation, We confirmed that the precipitation and the filtration can be done efficiently using the engineering scale equipment and that the fuel pellets are directly prepared by the calcination of the precipitates. On the basis of these results, we evaluated that the proposed system is expected to be one of candidates of the future reprocessing systems for spent FBR fuels.

Journal Articles

Application of magnetic Compton scattering for spin-specific magnetic hysteresis measurement

Agui, Akane; Sakurai, Hiroshi*; Tamura, Takuro*; Kurachi, Toshitaka*; Tanaka, Masahito*; Adachi, Hiromichi*; Kawata, Hiroshi*

Journal of Synchrotron Radiation, 17(3), p.321 - 324, 2010/05

 Times Cited Count:16 Percentile:62.86(Instruments & Instrumentation)

An application of magnetic Compton scattering as a new tool to measure a spin-specific magnetic hysteresis loop was introduced and demonstrated its validity. The applied magnetic field dependence of the integrated intensity of magnetic Compton scattering spectra was interpreted as the spin-specific hysteresis in this study.

Journal Articles

Recent progress in the energy recovery linac project in Japan

Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05

Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.

Journal Articles

Design of a 500kV electron gun for ERL light source at KEK

Yamamoto, Masahiro*; Honda, Yosuke*; Miyajima, Tsukasa*; Uchiyama, Takashi*; Kobayashi, Masanori*; Muto, Toshiya*; Matsuba, Shunya*; Sakanaka, Shogo*; Sato, Kotaro*; Saito, Yoshio*; et al.

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.860 - 862, 2009/08

A newly 500 kV electron gun (2nd - 500 kV gun) for an ERL light source is designed at KEK. A new concept and state of-the-art technologies of vacuum system, ceramic insulators, high voltage power supply, photocathode and preparation system will be employed. The details are described in this report.

Journal Articles

Recent progress of construction for compact Energy Recover Linac

Kobayashi, Yukinori*; Sakanaka, Shogo*; Sato, Kotaro*; Kasuga, Toshio*; Kawata, Hiroshi*; Hajima, Ryoichi; Nakamura, Norio*

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.66 - 69, 2009/08

Future synchrotron light source based on the Energy Recovery Linac (ERL) is expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation with a potential of the oscillating type for X-ray free electron laser. We are constructing the R&D machine which is called the compact ERL including the developments of an ultra-low emittance electron gun and superconducting cavities for both the injector and the main linacs under the collaboration between KEK, JAEA, ISSP, and other institutes. In this paper, we report recent progress of the construction for the compact ERL with a repair of a KEK east counter hall.

Journal Articles

Progress in R&D efforts on the energy recovery linac in Japan

Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.

Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06

Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.

Journal Articles

Status of R&D efforts toward the ERL-based light source

Sakanaka, Shogo*; Kobayashi, Yukinori*; Sato, Kotaro*; Kasuga, Toshio*; Kawata, Hiroshi*; Hajima, Ryoichi; Nakamura, Norio*

Proceedings of 5th Annual Meeting of Particle Accelerator Society of Japan and 33rd Linear Accelerator Meeting in Japan (CD-ROM), p.225 - 227, 2008/00

Collaborative research efforts towards future ERL-based light sources are carried out. We present the R&D status of an electron gun and superconducting cavities, updated design study on the test facility (Compact ERL).

JAEA Reports

Research on the geochemical behaviors of TRU nuclides

Tsaka, Hiroshi*; Kawata, Yousuke*

PNC TJ121 85-04VOL1, 27 Pages, 1985/06

PNC-TJ121-85-04VOL1.pdf:0.98MB

None

Oral presentation

Three decades of forward steps and prospects in Tokai Reprocessing Plant, 7; Experience and equation of radioactive waste

Kawata, Tsuyoshi; Kojima, Hiroshi; Kanamaru, Yoshiyuki; Wakayama, Yoshinori

no journal, , 

no abstracts in English

Oral presentation

Future light source based on energy recovery linac at Japan

Hajima, Ryoichi; Kawata, Hiroshi*; Kasuga, Toshio*; Sato, Kotaro*; Nakamura, Norio*

no journal, , 

no abstracts in English

Oral presentation

Spin hysteresis of rare-earth trasition metal amolphous film

Agui, Akane; Kurachi, Toshitaka*; Sakurai, Hiroshi*; Tamura, Takuro*; Tanaka, Masahito*; Koizumi, Akihisa*; Kawata, Hiroshi*; Adachi, Hiromichi*

no journal, , 

no abstracts in English

Oral presentation

Next generation light sources based on energy recovery linacs

Hajima, Ryoichi; Kawata, Hiroshi*; Sato, Kotaro*; Kasuga, Toshio*; Nakamura, Norio*

no journal, , 

no abstracts in English

Oral presentation

Hysteresis measurement of TbCo by Compton scattring

Agui, Akane; Kurachi, Toshitaka*; Sakurai, Hiroshi*; Tamura, Takuro*; Tanaka, Masahito*; Koizumi, Akihisa*; Kawata, Hiroshi*; Adachi, Hiromichi*

no journal, , 

no abstracts in English

Oral presentation

Electroic states at the interface of Fe/MgO magnetic tunneling junction

Sakurai, Hiroshi*; Tamura, Takuro*; Kurachi, Toshitaka*; Homma, Satoshi*; Oike, Hiromi*; Agui, Akane; Sakurai, Yoshiharu*; Ito, Masayoshi*; Adachi, Hiromichi*; Kawata, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Stsatus of the ERL light source project

Hajima, Ryoichi; Kawata, Hiroshi*; Kasuga, Toshio*; Sato, Kotaro*; Nakamura, Norio*; Sakanaka, Shogo*; Kobayashi, Yukinori*

no journal, , 

no abstracts in English

Oral presentation

Development status of the ERL light source

Hajima, Ryoichi; Sakanaka, Shogo*; Kobayashi, Yukinori*; Kasuga, Toshio*; Sato, Kotaro*; Kawata, Hiroshi*; Nakamura, Norio*

no journal, , 

no abstracts in English

Oral presentation

Proposal of a $$gamma$$-ray NDA experiment at the Compact ERL

Hajima, Ryoichi; Hayakawa, Takehito; Seya, Michio; Kawata, Hiroshi*; Kobayashi, Yukinori*; Urakawa, Junji*

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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