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Communication Dans Un Congrès Année : 2019

Development and validation of agglomeration model for CFD simulations of aerosol dispersion during Fukushima fuel debris retrieval

Christophe Chagnot
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Christophe Journeau
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Damien Roulet
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Résumé

The general context of this article is related to demonstrate the feasibility of the use of the laser cutting technique for the fuel debris retrieval on the damaged reactors of Fukushima Dai-ichi. IRSN is involved in a project led by ONET, in collaboration with CEA, to bring relevant elements to analyze the risk occurred by the dispersion of aerosols emitted by the dismantling operations. During the laser cutting operations for retrieving the fuel debris in air condition, particles will be produced, inducing a potential risk of dispersion into the environment. Hence, evaluating the amount of aerosols able to deposit on the walls and those able to be released into the environment is one of the safety key issues in the dismantling actions of reactors of Fukushima Dai-ichi. For that, IRSN performed computational fluid dynamics (CFD) simulations of dispersion, agglomeration and deposition of particles whose size distribution was measured during laser cutting operations of inactive fuel simulants (Chagnot et al., 2018, Porcheron et al., 2018). These simulations were conducted with the ANSYS CFX CFD code into which a moment method called DQMOM and a deposition model previously developed by IRSN (Nerisson et al., 2011) were implemented. The first numerical results (Gelain et al., 2018) showed a quite good agreement with the experimental ones for a standard particle size distribution (lognormal with one mode), but some improvements are needed for less classical distributions such bimodal ones. The work presented here proposes an alternative method to the previous one allowing taking into account different kinds of particle size distribution in the CFD simulations of particle agglomeration. This method uses the real experimental distribution to calculate the distribution moments which are then directly implemented in the simulation instead of using a lognormal fit. The previous CFD simulations were calculated again by using this method and showed a better agreement with the experimental results issued from aerosol source term characterization for both absolute values and time evolutions.
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hal-02478477 , version 1 (13-02-2020)

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  • HAL Id : hal-02478477 , version 1

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Thomas Gelain, Emmanuel Porcheron, Christophe Chagnot, Christophe Journeau, Damien Roulet. Development and validation of agglomeration model for CFD simulations of aerosol dispersion during Fukushima fuel debris retrieval. International Topical Workshop on Fukushima Decommissioning Research - FDR2019 FDR, May 2019, Naraha, Japan. ⟨hal-02478477⟩
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