DEVELOPMENT OF EVALUATION METHOD FOR AEROSOL PARTICLE DEPOSITION IN A REACTOR BUILDING BASED ON CFD

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  • Horiguchi Naoki
    Development Group for LWR Advanced Technology LWR Key Technology Development Division Nuclear Science and Engineering Center Japan Atomic Energy Agency
  • Miyahara Naoya
    Development Group for LWR Advanced Technology LWR Key Technology Development Division Nuclear Science and Engineering Center Japan Atomic Energy Agency
  • Uesawa Shin-ichiro
    Development Group for LWR Advanced Technology LWR Key Technology Development Division Nuclear Science and Engineering Center Japan Atomic Energy Agency
  • Yoshida Hiroyuki
    Development Group for LWR Advanced Technology LWR Key Technology Development Division Nuclear Science and Engineering Center Japan Atomic Energy Agency
  • Osaka Masahiko
    Development Group for LWR Advanced Technology LWR Key Technology Development Division Nuclear Science and Engineering Center Japan Atomic Energy Agency

抄録

For source term evaluation from reactor buildings (RBs) in LWR severe accidents (SAs), we have launched to develop an evaluation method of FP aerosol particle deposition onto surfaces of internal structures in an RB based on computational fluid dynamics (CFD). This paper describes development of a CFD simulation tool as the base part of the evaluation method. A commercial CFD code ANSYS-FLUENT was used with simplified rebound model. A preliminary simulation for a representative RB under a representative flow condition was conducted to confirm the tool performance by roughly grasping the deposition behaviors of FP aerosol particle and decontamination factor (DF) in the RB. The modelled RB contains five floors, internal structures and the containment vessel. Number and size of cells in the numerical domain were optimized considering both the accuracy and calculation cost. The behaviors of aerosol particles and surrounding gas field were assumed as steady state and calculated by EulerLagrange method. Calculation results showed that most of aerosol particles were deposited along with gas flow formed by the internal structures in the RB, demonstrating the advantageous feature of the present CFD tool. The DFs from 4 to 14 were obtained with increase of the particle diameters from 0.1 to 10 m as expected in terms of the particle movement equation. Besides, it was shown that the necessity of the appropriate deposition models for the decontamination by RBs, e.g. particle rebound on walls. Thus, it can be concluded that the CFD tool equipped with several basic models have successfully been developed, showing a good performance for aerosol particle deposition in RBs.

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