Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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EVALUATION OF METHODOLOGY FOR AXISYMMETRIC SIMULATION OF RCCS IN VHTR

초고온가스로의 RCCS 해석을 위한 축대칭 모사 방법론 평가

  • 김성훈 (한국원자력연구원, 스마트개발본부) ;
  • 조봉현 (한국원자력연구원, 수소생산원자로기술개발부) ;
  • 탁남일 (한국원자력연구원, 수소생산원자로기술개발부) ;
  • 김민환 (한국원자력연구원, 수소생산원자로기술개발부)
  • Received : 2009.06.03
  • Accepted : 2010.03.12
  • Published : 2010.03.31
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Abstract

RCCS is a passive safety-related system that removes the decay heat of VHTR when normal decay heat removal systems are in failure. Understanding thermo-hydraulics of RCCS is important to design a safer VHTR. RCCS consists of 292 cooling panels, which are placed in the reactor cavity. The layout of RCCS gives an idea that, for CFD simulations, cooling panels can be assumed to be one annulus tube. This assumption can reduce significantly the computational time, especially for the unsteady simulation. To simulate RCCS in an axisymmetric manner, three models were suggested and compared. Each model has (1) the same outer radius, (2) the same cross-sectional area (3) the same pressure drop, respectively, as the RCCS cooling panels. The steady-state simulation was conducted with these three models and the DO radiation model. It is found that over 90% of the heat from the outer wall of the reactor pressure vessel is transported to the RCCS by radiative heat transfer. The simulation with the third model, which has the same pressure drop as the design, estimates the closest wall temperature profiles to a thermo-hydraulic code, GAMMA+, result.

Keywords

References

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