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RESEARCH AND DEVELOPMENT OF RUBBER BEARINGS FOR SODIUM-COOLED FAST REACTOR: ULTIMATE PROPERTIES OF A HALF SCALE THICK RUBBER BEARINGS

[+] Author and Article Information
Tsuyoshi Fukasawa

Mitsubishi FBR Systems, 2-34-17, Jingumae, Shibuya-ku, Tokyo, 150-0001, JAPAN
tsuyoshi_fukasawa@mfbr.mhi.co.jp

Shigeki Okamura

Mitsubishi FBR Systems, 2-34-17, Jingumae, Shibuya-ku, Tokyo, 150-0001, JAPAN
shigeki_okamura@mfbr.mhi.co.jp

Tomohiko Yamamoto

Japan Atomic Energy Agency, 4002, Narita-cho, Oarai-machi, Ibaraki, JAPAN
yamamoto.tomohiko@jaea.go.jp

Nobuchika Kawasaki

Japan Atomic Energy Agency, 4002, Narita-cho, Oarai-machi, Ibaraki, JAPAN
kawasaki.nobuchika@jaea.go.jp

Tsutomu Hirotani

Shimizu Corporation, 2-16-1, Kyobashi, Chuo-ku, Tokyo, JAPAN
hirotani@shimz.co.jp

Eriko Moriizumi

Shimizu Corporation, 2-16-1, Kyobashi, Chuo-ku, Tokyo, JAPAN
eriko.moriizumi@shimz.co.jp

Yu Sakurai

Bridgestone Corporation, 1, Kashio-cho, Totsuka-ku, Yokohama, Kanagawa, JAPAN
yu.sakurai@bridgestone.com

Nobuo Masaki

Bridgestone Corporation, 1, Kashio-cho, Totsuka-ku, Yokohama, Kanagawa, JAPAN
nobuo.masaki@bridgestone.com

1Corresponding author.

ASME doi:10.1115/1.4038435 History: Received September 02, 2016; Revised November 06, 2017

Abstract

This paper describes the results of static loading tests using a half-scale thick rubber bearing to investigate ultimate properties application for a Sodium-cooled-Fast-Reactor (SFR). 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 installed in the reactor building, and to reduce seismic response in the vertical direction as well as horizontal direction. The thick rubber bearings, 1600 mm in diameter at full scale, have been designed to provide a rated load of about 10000 kN, corresponding to the compressive stress of 5.0 MPa, with a horizontal natural period of 3.4 s and a vertical natural period of about 0.133 s. The restoring-force characteristics including variations and breaking points regarding the thick rubber bearings have not been cleared yet. These validations are essential from the point of view of Probabilistic Risk Assessment (PRA) for a base isolated nuclear plant as well as to verify the structural integrity of the thick rubber bearing. The purpose of this paper is to indicate the variation of the stiffness and damping ratio concerning restoring force characteristics and the breaking strain or stress as ultimate properties through static loading tests using the half-scale thick rubber bearings. In addition, an analytical model for the thick rubber bearing which is able to express the non-linear restoring force including the breaking points is presented.

Copyright (c) 2017 by ASME
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