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Radiative transfer during the reflooding step of a LOCA

Abstract : Within the evaluation of the heat transfer downstream a quench front during the reflood phase of a Loss of Coolant Accident (LOCA) in a nuclear power plant, a numerical study has been conducted on radiative transfer through a vapor–droplet medium. The non-grey behavior of the medium is obvious since it can be optically thin or thick depending on the wavelength. A six wide bands model has been tested, providing a satisfactory accuracy for the description of the radiative properties. Once the radiative properties of the medium computed, they have been introduced in a model solving the radiative heat transfer based on the Improved Differential Approximation. The fluxes and the flux divergence have been computed on a geometry characteristic of the reactor core showing that radiative transfer plays a relevant role, quite as important as convective heat transfer.
Keywords : Radiative transfer
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Submitted on : Tuesday, January 10, 2017 - 3:13:18 PM
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Jonathan Gerardin, N. Seiler, Pierre Ruyer, Pascal Boulet. Radiative transfer during the reflooding step of a LOCA. Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2013, 128, pp.43 - 51. ⟨10.1016/j.jqsrt.2012.07.007⟩. ⟨hal-01431061⟩



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