Seismic design and applications using 3-dimensional seismic isolation system

Yamamoto, Tomohiko; Okamura, Shigeki; Hirayama, Tomoyuki*; Somaki, Takahiro*

Haikan Gijutsu, 65(13), p.1 - 4, 2023/11

The authors are conducting research and development on three-dimensional seismic isolation devices to improve the earthquake resistance of future sodium-cooled fast reactors. This paper introduces an overview of the device and how to use it.

Progress in conceptual design of a pool-type sodium-cooled fast reactor in Japan

Kato, Atsushi; Kubo, Shigenobu; Chikazawa, Yoshitaka; Miyagawa, Takayuki*; Uchita, Masato*; Suzuno, Tetsuji*; Endo, Junji*; Kubo, Koji*; Murakami, Hisatomo*; Uzawa, Masayuki*; et al.

Proceedings of International Conference on Fast Reactors and Related Fuel Cycles; Sustainable Clean Energy for the Future (FR22) (Internet), 11 Pages, 2022/04

The authors are carrying out conceptual design studies for a pool-type sodium-cooled fast reactor. There are main challenges such as measures against severe earthquake in Japan, thermal hydraulic in a reactor vessel (RV), a decay heat removal system design. When the JP-pool SFR of 650 MWe is installed in Japan, it shall be designed against the severe seismic conditions. Additionally, a newly three-dimensional seismic isolation system is under development.

Study on optimaI vertical isolation characteristics

;

JNC TN9400 2000-060, 168 Pages, 2000/05

JNC-TN9400-2000-060.pdf:4.09MB

Optimal vertical isolation characteristics were studied for the structural concept of vertical seismic isolation system, which uses a common deck and a set of large coned dish springs. Four kinds of earthquake wave and three kinds of artificial seismic wave were used. The earthquake response analysis of a base isolated building was carried out considering some ground conditions and some vertical vibration characteristics of the building isolator. Floor response and acceleration time history at the vertical isolation level were arranged. Using the acceleration time history as a seismic input, the earthquake response analysis of the vertical isolation system according to single degree of freedom model was carried out. Linear analysis and non-linear analysis were made. ln the linear analysis, vertical isolation frequency was examined within 0.8 to 2.5 Hz, and damping ratio was examined within 2 to 60%. ln the non-linear analysis, it was examined within vertical isolation frequency 0.5 to 5Hz, which depended only on the rigidity of the coned disk spring, rigidity ratio of the damping devise 1 to 20 and yield seismic intensity of the damping devise 0.01 to 0.2. As the optimal vertical isolation characteristics of the system, the criterion of largest relative displacement, maximum acceleration and maximum value of the floor response acceleration between 5 to 12Hz was set, the combination region of the appropriate parameter were examined. ln case of largest relative displacement 50mm, acceleration response magnification of 0.75, floor response magnification of 0.33 were used as a criterion, from the result of the linear analysis, vertical frequency was set at 0.8 to l.2 Hz, and by combining the damping ratio over 20 %, it was proven that appropriate vertical isolation characteristics were obtained. The result of the non-linear analysis showed that the combination of the coned disk spring of vertical frequency 0.8 to 1.0 Hz and the damping element of rigidity ...

R&D of seismic isolation system; R&D for fusion

Okawa, Yoshinao; Akutsu, Yoichi; Suzuki, Hideyuki; ; ; ;

Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1047 - 1048, 1995/00

no abstracts in English

Research and development of three-dimensional seismic isolation system, 29; Test results of sine wave excitation and pseudo seismic wave excitation for excitation for damper with high-allowable velocity

Adachi, Yoshihiko*; Endo, Naoki*; Fukasawa, Tsuyoshi*; Somaki, Takahiro*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Okamura, Shigeki*

no journal, , 

no abstracts in English

Research and development of three-dimensional seismic isolation system, 31; Outline of seismic response analysis for reactor building

Somaki, Takahiro*; Morobishi, Ryota*; Fukasawa, Tsuyoshi*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Okamura, Shigeki*

no journal, , 

no abstracts in English

A Study on structures of reactor vessel of pool-type sodium-cooled fast reactor in case of adopted three-dimensional seismic isolation system

Uchita, Masato*; Miyagawa, Takayuki*; Murakami, Hisatomo*; Suzuno, Tetsuji*; Yamamoto, Tomohiko

no journal, , 

no abstracts in English

Research and development of three-dimensional seismic isolation system, 35; Study summary of three-dimensional isolation system and horizontal oil damper

Okamura, Shigeki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Hirayama, Tomoyuki*; Fukasawa, Tsuyoshi*; Fujita, Satoshi*; Somaki, Takahiro*; Endo, Naoki*

no journal, , 

no abstracts in English

Research and development of three-dimensional seismic isolation system, 37; Load-displacement test results of disc-spring and sliding elements

Morobishi, Ryota*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*

no journal, , 

no abstracts in English

Research and development of three-dimensional seismic isolation system, 39; Integrated test results of three-dimensional seismic isolation system (1)

Yukawa, Masaki*; Somaki, Takahiro*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*

no journal, , 

no abstracts in English