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Imamoto, Nobuo; Koiso, Keiichi
JAEA-Technology 2012-016, 27 Pages, 2012/06
JAEA-Technology-2012-016.pdf:1.49MB
The shaking table tests have been employed to evaluate the seismic fragilities of the machine-electric equipments. Through the shaking table test, in ordinarily it is depending on resonance frequency, repetitive adjustments are needed to search a normal/malfunction boundary. However, a small relay used for the electric panel and the control system, can not be measured the resonance frequency because the acceleration sensor installation affects the vibration characteristic of the test body. And more, the moving parts leading to a relay malfunction is settled in the case, it can not be carried out direct measurement of the vibration. To improve the shaking table test methods, magnetization current perturbation method was invented and developed. Instead the mechanical shaking force, magnetization current perturbation method employs vibrating electromagnet force. Moreover, obtained impedance characteristic curve, the resonance frequency can be obtained by fitting to a theoretical curve. This paper deals with the principle of the magnetization current perturbation method, theoretical derivation of impedance, measurement electronics circuit, and system design and test results.
Sakaguchi, Shinobu; Tachibana, Ikuya; Koshino, Katsuhiko; Shirozu, Hidetomo; Shirai, Nobutoshi; Imamoto, Nobuo; Tomita, Tsuneo; Tobita, Hiroo; Yamanaka, Atsushi; Kobayashi, Daisuke; et al.
JAEA-Technology 2011-006, 24 Pages, 2011/03
JAEA-Technology-2011-006.pdf:3.07MB
In the Niigataken Chuetsu-oki Earthquake on 2007, observed earthquake motion exceeded design base at the Kashiwazaki Kariwa nuclear plant. However, there was no earthquake damage in safety important equipments to stop reactor, to cool reactor, and to contain radioactive materials. One of this reason is said that many safety margin are included in the design and the permissible value. To know more accurate safety margin, shearing force examinations for the base bolts were conducted. In examinations, delegate test-bolts were made; the test bolts were selected from heavier equipment in Tokai Reprocessing Plant. In this report, the shearing strength obtained from the examinations shows more accurate safety margin.
Imamoto, Nobuo
Gijutsushi, 21(6), p.12 - 15, 2009/06
Recently, interest in the nuclear power generation is becoming large globally. The nuclear fuel cycle facility is required to possess safety measures in the design and the operation. In addition, it is required to obtain the relief, the PE of Nuclear and Radiation is expected to play a role in risk communication.
Motohashi, Masahiro; Kyue, Tadashi; Imamoto, Nobuo; Ichinosawa, Hitoshi; Inanobe, Kazuhide*
Saikuru Kiko Giho, (27), p.96 - 97, 2005/06
The general-condition report of LWTF is carried to
Masahiro, Motohashi,; Tadashi, Kyue,; Imamoto, Nobuo; Ichinosawa, Hitoshi; Inanobe, Kazuhide*
Saikuru Kiko Giho, (26), p.131 - 132, 2005/00
The general-condition report of LWTF is carried to "JNC Technical Review No.26 2005.3"
Masahiro, Motohashi,; Tadashi, Kyue,; Imamoto, Nobuo; Ichinosawa, Hitoshi; Inanobe, Kazuhide*
Saikuru Kiko Giho, (24), p.82 - 83, 2004/00
The general-condition report of LWTF is carried to "JNC Technical Review No.24 2004.9"
Masahiro, Motohashi,; Tadashi, Kyue,; Imamoto, Nobuo; Ichinosawa, Hitoshi; Inanobe, Kazuhide*
Saikuru Kiko Giho, (25), 132- Pages, 2004/00
The general-condition report of LWTF is carried to "JNC Technical Review No.25 2004.12"
Sn cable-in-conduit conductorAndo, Toshinari; Takahashi, Yoshikazu; Nishi, Masataka; Shimamoto, Susumi; Aoki, Nobuo*; *
Teion Kogaku, 22(6), p.362 - 367, 1987/00
no abstracts in English
Imamoto, Nobuo; Koiso, Keiichi
no journal, ,
no abstracts in English
