著者

深沢 剛司 下地 邦幸 河村 雅也 岡村 茂樹 木曽原 直之 江沼 康弘

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会 年会・大会予稿集

巻号頁・発行日

vol.2012, 2012

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近年に生じた地震と同規模の地震動がナトリウム冷却炉(JSFR)に作用した場合を想定し、主要機器を対象に耐震性を評価した。本報ではその結果について述べる。

著者

深沢 剛司 岡村 茂樹 山本 智彦 川崎 信史 稲葉 学 杣木 孝裕 鮫島 祐介 正木 信男

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.852, pp.17-00050-17-00050, 2017 (Released:2017-08-25)

参考文献数

17

被引用文献数

2

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This paper describes design formulas and creep characteristics for thick rubber bearing applied to the Sodium-cooled Fast Reactor, which are based on the static loading test and creep test using scale models. The thick rubber bearing, which has a rubber layer roughly two times thicker in comparison with conventional rubber bearings, has been developed by the authors to ensure seismic safety margins for components by reducing the seismic response for the reactor building in the horizontal direction and vertical direction. The static loading tests using a scale model with parameter of first shape factor were conducted to investigate the applicability of proposed design formulas. Moreover, an estimation of creep characteristics due to aging is important issue because the rubber layer of thick rubber bearing which satisfies the design requirement for SFR is larger than conventional rubber layer. The creep test was preformed to estimate the creep characteristics using a scale model. From the above results, the thick rubber bearing is sufficiently rational for use as isolation system for SFR.

著者

渡壁 智祥 山本 智彦 深沢 剛司 岡村 茂樹 杣木 孝裕 諸菱 亮太 櫻井 祐 加藤 亨二

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00444-16-00444, 2017 (Released:2017-06-25)

参考文献数

9

被引用文献数

1

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A seismic isolation system composed of a thick rubber bearing and an oil damper has been developed for Sodium-Cooled Fast Reactor. One of the advantages of the isolation system is the use of thick rubber bearings to ensure the longer vertical natural period of a plant, thereby mitigating seismic loads to mechanical components. Characteristics of thick rubber bearings have been confirmed through a series of tests. This paper focused on the aging properties of thick rubber bearings, such as basic mechanical properties and ultimate strength. An aging test of thick rubber bearings was conducted using 1/2-scale (800 mm diameter) and 1/8-scale (200 mm diameter) rubber bearings. Aging of the rubber bearings was reproduced using thermal degradation based on Arrhenius law, in which the target of aging periods was 60 years, plant life time. The hysteresis loops of the thick rubber bearings after aging were obtained through horizontal and vertical static loading tests, and the effects of aging were evaluated by comparison with the initial mechanical properties. In addition, for the purpose of further research, the effect of scale by aging was clarified to compare the mechanical properties between the 1/2-scale and 1/8-scale rubber bearings.