Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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.
Fukasawa, Tsuyoshi*; Miyagawa, Takayuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Okamura, Shigeki*; Fujita, Satoshi*
Nihon Kikai Gakkai Rombunshu (Internet), 87(898), p.21-00007_1 - 21-00007_17, 2021/06
This paper describes a fundamental study on the seismic safety margin for the isolated structure using laminated rubber bearings. The variation of the seismic response assumed in the isolated structure will occur under the superposition of "Variations in seismic response due to input ground motions" and "Error with design value accompanying manufacture of the isolation devices ". The seismic response analysis which allows to their conditions is important to assess the seismic safety margin for the isolated structure. This paper clarifies that the seismic safety margin of the isolated structure, which consists of rubber bearings, for Sodium-cooled Fast Reactor (SFR) is ensured against the basis ground motions of Japan Electric Association Guide 4601 (JEAG4601) and SFR through the seismic response analysis considering the variation factors of seismic response. In addition, a relationship between the seismic safety margin and the excess probability of linearity limits is discussed using the results of seismic response analysis.
; ; Yamazaki, Toshihiko; ; ; Kondo, Toshinari*; *
JNC TN8400 2001-030, 99 Pages, 2002/01
JNC-TN8400-2001-030.pdf:13.24MB
There is a great deal of that we build a Base-Isolated building with the quaternary deposit ground. In an atomic energy institution, a study request is strong. When we build a Base-Isolated building with the quaternary deposit ground, evaluation of earthquake vibration of a vertical direction is an important problem. In an atomic energy institution, we design it by big earthquake load, and therefore examination is necessary. And, in this study, we do examination to build a Base-Isolated building with the quaternary deposit ground, we report it about an evaluation method of a design. Furthermore, we report that we estimated pipe laying and machinery to put in a building of Base-lsolated.
;
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 ...
Okawa, Yoshinao; Yagenji, Akira; Wakui, Toshiaki*; Murano, Yoshihiro*; Kawakami, Kunio*; Yamakura, Hideki*
Heisei 10-Nendo (Dai-16-Kai) Denki Setsubi Gakkai Zenkoku Taikai Koen Rombunshu, p.175 - 176, 1998/00
no abstracts in English
; *; Shibata, Katsuyuki; *; *; *; *; *
Dai-24-Kai Jishin Kogaku Kenkyu Happyokai Koen Rombunshu, 1, p.309 - 312, 1997/07
no abstracts in English
; *; Shibata, Katsuyuki; *; *; *; *
Dai-1-Kai Menshin, Seishin Korokiumu Koen Rombunshu, 0, p.447 - 454, 1996/11
no abstracts in English
Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1147 - 1148, 1996/00
no abstracts in English
Takeda, M.*; Okawa, Yoshinao; *; Akutsu, Yoichi; *
Seismic,Shock,and Vibration Isolation 1995 (PVP-Vol. 319), 0, p.317 - 322, 1995/00
no abstracts in English
; *; *; *
Dai-9-Kai Nihon Jishin Kogaku Shimpojiumu (1994) Rombunshu, Dai-1-Bunsatsu, 0, p.1771 - 1776, 1994/00
no abstracts in English
Okawa, Yoshinao; Akutsu, Yoichi; Suzuki, Hideyuki; *; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1725 - 1726, 1994/00
no abstracts in English
; *
Dai-22-Kai Jishin Kogaku Kenkyu Happyokai Rombunshu, p.815 - 818, 1993/00
no abstracts in English
;
Nucl. Eng. Des., 142, p.319 - 326, 1993/00
Times Cited Count：4 Percentile：44.87(Nuclear Science & Technology)no abstracts in English
Yamamoto, Tomohiko; Watakabe, Tomoyoshi; Okamura, Shigeki*; Fukasawa, Tsuyoshi*
no journal, ,
This paper summarizes the results of each experiment for thicker laminated rubber bearingand shows that the thicker laminated rubber bearing is useful for seismic isolation system for SFR.
Yamamoto, Tomohiko; Fukasawa, Tsuyoshi*; Somaki, Takahiro*; Hirokawa, Atsushi*; Miyagawa, Takayuki*; Okamura, Shigeki*
no journal, ,
High speed type horizontal oil damper is developed for three dimensional seismic isolation system for SFR. This paper describes the experimental plan of this oil damper.
Okamura, Shigeki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Fukasawa, Tsuyoshi*; Fujita, Satoshi*
no journal, ,
no abstracts in English
