NUMERICAL SIMULATION OF DIRECT CONTACT CONDENSATION IN CONTAINMENT SUPPRESSION POOL WITH MELCOR

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  • Liu Xinxing
    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University
  • Sun Zhongning
    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University
  • Wang Jianjun
    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University
  • Meng Zhaoming
    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University

抄録

The pressure suppression pool plays an important role in BWR reactor, which was designed to have the capability as a heat sink and condenser in concern of the LOCA (loss of coolant accident). The DCC (direct contact condensation) is the main process occurred in the suppression pool when large amount of steam was vent into the pool through the blow down pipes from the dry well. Many research works have confirmed that CFD (computational fluid dynamics) codes are suitable to reproduce the important phenomena in a suppression pool. However, the computational challenge is remarkable. Comparing to the accurate CFD methods, MELCOR allows to simulate a full containment accident with enough accuracy and affordable computational cost. This paper aims to assess the feasibility of MELCOR applying in the suppression pool analysis. The models and correlations used in MELCOR are first examined with the experimental data of PPOOLEX program of Lappeenranta University of Technology. The evolutions of pressure and temperature in the drywell and wet well are analyzed. The disagreement between the simulated and experimental results confirms the need of improvement of the condensation models in the MELCOR.

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