The Effect of Fluid-Structure Interaction on the Dynamic Response of Reactor Internals

유체-구조물 상호작용이 원자로내부구조물의 동적응답에 미치는 영향

  • 정명조 (한국원자력연구소 원자로기계설계실) ;
  • 박찬국 (전남대학교 기계공학과) ;
  • 황원걸 (전남대학교 기계설계학과)
  • Published : 1993.12.01

Abstract

Investigated in this paper is the effect of fluid-structure interaction between reactor internal components due to their immersion in a confining fluid on the dynamic responses. A non-linear mathematical model is developed for the dynamic analysis of the reactor internals, which includes lumped masses, stiffnesses and hydrodynamic couplings. The hydrodynamic mass matrix which characterizes the fluid-structure interaction is calculated. Also, the equations of motion containing hydrodynamic mass matrix are presented. The responses of the reactor internals due to seismic and pipe break excitations are obtained for the case of with- and without-hydrodynamic couplings and the different response characteristics are investigated.

원자로내부구조물은 유체속에 잠겨있기 때문에 동적해석시 이의 영향을 고려해야한다. 본 논문에서는 지진 및 배관파단에 대한 원자로내부구조물의 동적해석을 위한 비선형해석모델을 제시하였고 유체-구조물 상호작용의 효과를 고려하는 방법에 대하여 설명하였다. 실제 해석을 통하여 유체-구조물 상호작용이 원자로내부구조물의 응답에 미치는 영향을 조사한 결과 지진해석시에는 유체-구조물 상호작용을 나타내는 hydrodynamic coupling항이 첨가됨으로써 높은 응답이 나왔으나, 배관파단시에는 이와 반대의 결과가 나왔다.

Keywords

References

  1. ASME PVP v.253 The Effect of Fluid/Structure Interaction on the Reactor Internals Responses for Seismic and Pipe Break Excitations M.J.Jhung(et al.)
  2. Technical Report SCL-DR-65-34 SHOCK, A Computer Code for Solving Lumped-Mass Dynamic Systems V.K.Gabrielson
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