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The long-term effects on solidification/stabilization (s/s) of the secondary wastes, resulting from the oxidative degradation of some solid cellulosic-based wastes, in Portland Cement (CEM I) have been investigated by X-ray diffraction (X-RD) and Fourier transform infrared spectroscopy (FT-IR) techniques. The effect of seven years leaching of the cemented waste forms obtained was carried out to assess the long-term immobilization behavior of the radionuclide in the solidified/stabilized waste that maybe exposed to fresh, ground or sea water.The results of this study confirm our previously published work that the oxidative degradation treatment of some cellulosic-based wastes is essential before incorporating into the cementitious inert matrix. In addition, the release of radionuclides from the cemented waste form is a diffusion controlling process, after the first washing out period lasting for nearly thirty days.Based on the results so far obtained it is concluded that Portland Cement could be considered as a potential inert matrix to immobilize the degraded cellulosic-based wastes for a short or long time of storage or a final disposal.