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Journal Articles

A Study on improvement of three-dimensional seismic analysis method of nuclear building using a large-scale observation system, 1; Analysis of entire response of the reactor building based on seismic observation records

Yamakawa, Koki*; Moritani, Hiroshi*; Saruta, Masaaki*; Iiba, Masanori*; Nishida, Akemi; Kawata, Manabu; Iigaki, Kazuhiko

Transactions of 27th International Conference on Structural Mechanics in Reactor Technology (SMiRT 27) (Internet), 10 Pages, 2024/03

no abstracts in English

Journal Articles

A Study on improvement of three-dimensional seismic analysis method of nuclear building using a large-scale observation system, 2; Analysis of local response of the reactor building based on artificial waves

Nishida, Akemi; Kawata, Manabu; Choi, B.; Kunitomo, Takahiro; Shiomi, Tadahiko; Iigaki, Kazuhiko; Yamakawa, Koki*

Transactions of 27th International Conference on Structural Mechanics in Reactor Technology (SMiRT 27) (Internet), 10 Pages, 2024/03

no abstracts in English

Journal Articles

A Study on improvement of three-dimensional seismic analysis method of nuclear building using a large-scale observation system, 3; Improvement and validation of three-dimensional seismic analysis method

Choi, B.; Nishida, Akemi; Shiomi, Tadahiko; Kawata, Manabu; Iigaki, Kazuhiko; Yamakawa, Koki*

Transactions of 27th International Conference on Structural Mechanics in Reactor Technology (SMiRT 27) (Internet), 8 Pages, 2024/03

no abstracts in English

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 (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

Activation in injection area of J-PARC 3-GeV rapid cycling synchrotron and its countermeasures

Yamamoto, Kazami; Yamakawa, Emi*; Takayanagi, Tomohiro; Miki, Nobuharu*; Kamiya, Junichiro; Saha, P. K.; Yoshimoto, Masahiro; Yanagibashi, Toru*; Horino, Koki*; Nakanoya, Takamitsu; et al.

ANS RPSD 2018; 20th Topical Meeting of the Radiation Protection and Shielding Division of ANS (CD-ROM), 9 Pages, 2018/08

The existing beam power of the J-PARC Rapid Cycling Synchrotron is up to 500 kW, and higher radiation doses are concentrated in the injection area. These activations are caused by the interaction between the foil and the beam. To reduce dose exposure to workers near the injection point, we study a new design of the injection scheme. Experience has shown that eddy currents are generated in the metal flange near the magnet owing to the pulsed magnetic field, and the temperature exceeds 100 degrees C. The shield installed in the new injection system needs to have a layer structure, in which an insulator is inserted between iron shields to reduce the eddy current. From the results of the shielding calculation, even if 1 mm of polyethylene was inserted between two 9-mm-thick SUS 316 plates, which serve as shielding material, the shielding performance was reduced only about 5%, and we confirmed that it would function well.

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

Oral presentation

A Study on improvement of three-dimensional seismic analysis methods of reactor building, 1; Development of large-scale observation system

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

no journal, , 

no abstracts in English

Oral presentation

A Study on improvement of three-dimensional seismic analysis methods of reactor building, 2; Analysis of the global response of the reactor building based on seismic observation records

Yamakawa, Koki*; Saruta, Masaaki*; Moritani, Hiroshi*; Iiba, Masanori*; Nishida, Akemi; Kawata, Manabu; Iigaki, Kazuhiko

no journal, , 

no abstracts in English

Oral presentation

A Study on improvement of three-dimensional seismic analysis methods of reactor building, 3; Analysis of local response of the reactor building based on artificial waves

Kawata, Manabu; Nishida, Akemi; Choi, B.; Iigaki, Kazuhiko; Yamakawa, Koki*

no journal, , 

no abstracts in English

Oral presentation

A Study on improvement of three-dimensional seismic analysis methods of reactor building, 4; Analysis by three-dimensional finite element model

Nishida, Akemi; Kawata, Manabu; Choi, B.; Iigaki, Kazuhiko; Yamakawa, Koki*

no journal, , 

no abstracts in English

Oral presentation

A Study on improvement of three-dimensional seismic analysis methods of reactor building, 5; Analysis of ground vibration characteristics based on observation records

Tsuchiya, Takashi*; Yamakawa, Koki*; Saruta, Masaaki*; Iiba, Masanori*; Hiramatsu, Masako*; Nishida, Akemi; Iigaki, Kazuhiko

no journal, , 

no abstracts in English

Oral presentation

A Study on improvement of three-dimensional seismic analysis methods of reactor building, 6; Analysis of vibration modes considering phase differences

Yamakawa, Koki*; Tsuchiya, Takashi*; Hiramatsu, Masako*; Moritani, Hiroshi*; Saruta, Masaaki*; Iiba, Masanori*; Nishida, Akemi; Kawata, Manabu; Iigaki, Kazuhiko

no journal, , 

no abstracts in English

Oral presentation

A Study on improvement of three-dimensional seismic analysis method of reactor building, 7; Vibration characteristics and modeling concept of three-dimensional finite element model of a reactor building

Shiomi, Tadahiko; Nishida, Akemi; Choi, B.; Kawata, Manabu; Iigaki, Kazuhiko; Yamakawa, Koki*

no journal, , 

no abstracts in English

14 (Records 1-14 displayed on this page)
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