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Structural Engineering and Mechanics
  Volume 43, Number 4, August25 2012, pages 475-502

Seismic modeling and analysis for sodium-cooled fast reactor
Gyeong-Hoi Koo, Suk-Hoon Kim and Jong-Bum Kim

    In this paper, the seismic analysis modeling technologies for sodium-cooled fast reactor (SFR) are presented with detailed descriptions for each structure, system and component (SSC) model. The complicated reactor system of pool type SFR, which is composed of the reactor vessel, internal structures, intermediate heat exchangers, primary pumps, core assemblies, and core support structures, is mathematically described with simple stick models which can represent fundamental frequencies of SSC. To do this, detailed finite element analyses were carried out to identify fundamental beam frequencies with consideration of fluid added mass effects caused by primary sodium coolant contained in the reactor vessel. The calculation of fluid added masses is performed by detailed finite element analyses using FAMD computer program and the results are discussed in terms of the ways to be considered in a seismic modeling. Based on the results of seismic time history analyses for both seismic isolation and nonisolation design, the functional requirements for relative deflections are discussed, and the design floor response spectra are proposed that can be used for subsystem seismic design.
Key Words
    sodium-cooled fast reactor; seismic analysis; fluid added mass; seismic isolation
Gyeong-Hoi Koo, Suk-Hoon Kim and Jong-Bum Kim: Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Daejeon 305-353, Korea

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