Seismic response of isolated nuclear power plant considering nonlinearity of rubber bearings

Oguro, Masato*; Fujita, Satoshi*; Minagawa, Keisuke*; Yamaguchi, Akira*; Takata, Takashi*; Kurisaka, Kenichi

no journal, , 

The concept of "Residual Risk" was introduced in "Regulatory Guide for Reviewing Seismic Design of Nuclear Power Reactor Facilities" that had been revised in 2006. As for the assessment of "Residual risk", it is necessary to consider the response to unexpected input wave. The other side, the application of an isolation system is examined as a technique to decrease the input to the nuclear power plant. Rubber bearings used as the isolation system cause nonlinearity in the restoring force when unexpected earthquake and has a bad influence for the response. Therefore, in this study, isolated building model considering nonlinearity of the rubber bearing was used, the effect of the isolation system is examined from the response of the building. In this paper, the observed wave of "The 2011 off the Pacific coast of Tohoku Earthquake" was used and seismic response analysis was carried out. As a result, it was confirmed to be able to decrease the response acceleration to 1/10 by the isolation system and the nonlinearity of the rubber bearing was generated by 5.2 times this earthquake wave.

Evaluation for flow-induced vibration of a primary circuit hot-leg piping in a sodium-cooled fast reactor, 2; Flow pattern and pressure fluctuation characteristics on the 1/3 scale hot-leg piping experiments

Sago, Hiromi*; Shiraishi, Tadashi*; Watakabe, Hisato*; Xu, Y.*; Aizawa, Kosuke; Yamano, Hidemasa

no journal, , 

no abstracts in English

Evaluation of flow-induced vibration of a primary circuit hot-leg piping in a sodium-cooled fast reactor, 4; LDV flow measurement in a 1/10-scale hot-log piping test facility

Iwamoto, Yukiharu*; Ogawa, Shota*; Yasuda, Kazunori*; Sogo, Motosuke*; Tanaka, Masaaki; Yamano, Hidemasa

no journal, , 

Numerical simulation for phenomenological evaluation of laser welding processes

Yamashita, Susumu; Yamada, Tomonori; Kunugi, Tomoaki*; Muramatsu, Toshiharu

no journal, , 

Toward the phenomenological understanding of laser welding repair processes for various reactor components by numerical simulation, we constructed laser welding simulation code which can treat combined physical phenomena including interfaces, a phase change and stress evaluation in solid materials using several advanced numerical models. In the calculations of low-power density laser welding, we obtained particular results in the welding, e.g., thermal-shaped molten pool, a welding bead and a stress distribution around the molten pool. Therefore, our numerical code will be appropriate tool for elucidating laser welding phenomena in the near future.

Microstructures of membrane electrode assembly investigated by polarization analysis neutron small-angle scattering; Water distribution in ion cluster

Koizumi, Satoshi; Kawakatsu, Toshihiro*; Tokumasu, Takashi*

no journal, , 

no abstracts in English