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Article Dans Une Revue Nuclear Engineering and Design Année : 2014

The challenge of modeling fuel-coolant interaction Part i - Premixing

S. Picchi
  • Fonction : Auteur
J. Lamome
  • Fonction : Auteur
B. Raverdy
G. Nicaise

Résumé

Fuel-coolant interaction is a complex mixing process that can occur during the course of a severe accident in a nuclear power plant involving core melting and relocation. Under certain circumstances, a steam explosion might develop during the mixing of the melt and the water and induce a loss of integrity of the containment. Even in the absence of an explosion, studying the mixing phenomenon is also of high interest due to its strong impact on the progression of the accident (debris bed formation, hydrogen production). This article is the first of two aiming at presenting both a status of research and understanding of fuel-coolant interaction and the main characteristics of the model developed in the 3-dimensional computer code MC3D. It is devoted to the premixing phase whereas the second is related to the explosion phase. A special attention is given to major difficulties, uncertainties and needs for further improvements in knowledge and modeling. We discuss more particularly the major phenomena that are melt fragmentation and film boiling heat transfer and the challenges related to modeling melt solidification and oxidation. Some highlights related to the code verification are finally given. © 2014 Elsevier B.V. All rights reserved.
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Dates et versions

hal-02641696 , version 1 (28-05-2020)

Identifiants

Citer

R. Meignen, S. Picchi, J. Lamome, B. Raverdy, S.C. Escobar, et al.. The challenge of modeling fuel-coolant interaction Part i - Premixing. Nuclear Engineering and Design, 2014, 280, pp.511-527. ⟨10.1016/j.nucengdes.2014.08.029⟩. ⟨hal-02641696⟩

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