[en] The effect of radiative transfer on Rayleigh-Benard convection in a fluid-saturated porous layer is studied using Goody's approach. The Milne-Eddington approximation is employed in obtaining the initial static state and linear stability analysis is performed. An equivalent single-phase two-flux model is used in deriving the equation of heat transport for transparent and opaque media. The critical Rayleigh number is obtained by the Galerkin method and radiation is shown to stabilize the system for both the transparent and opaque media. It is found that the opaque media releases heat for convection more slowly than transparent media. Radiation is shown to affect the cell size in the case of transparent media only. The results of the problem have applications in heat engine containing fluid saturated-packed bed which works on the regenerative cycle. (author)