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Watakabe, Tomoyoshi; Yamamoto, Tomohiko; Okamura, Shigeki; Miyazaki, Masashi; Miyagawa, Takayuki; Uchita, Masato*; Hirayama, Tomoyuki*; Somaki, Takahiro*; Yukawa, Masaki*; Fukasawa, Tsuyoshi*; et al.
Proceedings of ASME 2024 Pressure Vessels & Piping Conference (PVP 2024) (Internet), 10 Pages, 2024/07
To secure the seismic safety of the thin-walled mechanical components and piping under a severe design earthquake level, employing a three-dimensional (3D) seismic isolation system has been planned in a sodium-cooled fast reactor. The development results of the 3D isolation system have been reported in previous papers so far. Its update is reported in Part 7 to Part 9. Part 7 describes the overview of the development, the test plan of the isolation system in the assembled state of each element, and the performance of individual isolation elements. In part 8, the performance of the isolation device that each element was assembled into was investigated through loading tests. Part 9 reports analytical studies by an analysis model validated based on the insight of the test results.
Fukasawa, Tsuyoshi*; Hirayama, Tomoyuki*; Yokoi, Shinobu*; Hirota, Akihiko*; Somaki, Takahiro*; Yukawa, Masaki*; Miyagawa, Takayuki; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; et al.
Nihon Kikai Gakkai Rombunshu (Internet), 89(924), p.23-00023_1 - 23-00023_17, 2023/08
no abstracts in English
Morobishi, Ryota*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Nakamura, Misaki*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Yukawa, Masaki*; Somaki, Takahiro*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Somaki, Takahiro*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Endo, Naoki*; Adachi, Yoshihiko*; Hirayama, Tomoyuki*; Yukawa, Masaki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Nakamura, Misaki*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Yukawa, Masaki*; Somaki, Takahiro*; Hirayama, Tomoyuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Morobishi, Ryota*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Somaki, Takahiro*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Endo, Naoki*; Adachi, Yoshihiko*; Hirayama, Tomoyuki*; Yukawa, Masaki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Fukasawa, Tsuyoshi*; Hirayama, Tomoyuki*; Yokoi, Shinobu*; Hirota, Akihiko*; Somaki, Takahiro*; Yukawa, Masaki*; Miyagawa, Takayuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; et al.
no journal, ,
The seismic integrity of sodium-cooled fast reactor (SFR) designs in nuclear power plants is of paramount importance. Based on the static loading test, this study investigates the force-displacement relationship and load transference in a three-dimensional seismic isolation system that is envisaged for use in reactor buildings. In SFR designs, the necessity for thin-walled structures to maintain high-temperature structure integrity can unintentionally compromise the seismic design. Consequently, addressing horizontal and vertical seismic forces become vital for ensuring seismic resilience. Currently, there are no specific codes or standards governing the integration of Three-dimensional seismic isolation systems into nuclear reactor buildings. However, current guidelines for the design of horizontal seismic isolation systems emphasize the necessity to clarify the force-displacement relationship and load transfer under conditions of superimposed horizontal and vertical loads. This study involves static loading tests performed on a half-scale specimen, which is subjected to horizontal and vertical loads exceeding the design basis ground motions for the SFR. The findings affirm that the system's horizontal supporting function maintains the segregation of horizontal and vertical load transference, even under seismic loads that exceed the design basis ground motions.
Hirayama, Tomoyuki*; Yamamoto, Tomohiko; Morobishi, Ryota*; Yukawa, Masaki*; Nakamura, Misaki*
no journal, ,
Among the elements that make up the three-dimensional seismic isolation device, we report the results of element tests on the disc spring unit that provides the vertical seismic isolation effect, and the sliding element that enables vertical sliding motion while receiving a horizontal load.
Yukawa, Masaki*; Morobishi, Ryota*; Yamamoto, Tomohiko; Hirayama, Tomoyuki*; Yokoi, Shinobu*
no journal, ,
A half-scale combined test specimen was fabricated for a three-dimensional seismic isolation device in which thicker laminated rubber bearing and disc spring units are arranged in series, and a static loading test was carried out by simultaneous loading in both the horizontal and vertical directions. The test results demonstrated that this three-dimensional seismic isolation device maintained the specified design performance and smooth operation, and the device concept was established.
