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Cable insulation similar to that actually installed inside NUR research reactor tank, Algiers, Algeria was irradiated at NUR research reactor in two different positions: thermal colonne (thermal neutron fluence, φth= 1.7×1015 n.cm2, fast neutron fluence φf= (En> 2.8 MeV) 4.8×1012 n.cm², γ-ray dose = 2 kGy) and at the end of neutronography channel (φth=7.8×109 n.cm², φf=(En> 1.2 MeV) 2.9×1010 n.cm², γ-ray dose= 12 Gy). After irradiation thermal stability behaviour of the cable insulation components (polyethylene PE and Poly vinyl chloride PVC) were investigated using differential scanning calorimetry (DSC) and thermogravimetry (ATG-DTG) techniques. It is found that the melting temperature of PE insulator and the initial degradation temperature of PVC irradiated in thermal colonne position are shifted a little bit towards lower temperature. Whereas, no modification was observe for both PE and PVC components irradiated at the end of neutronography channel. Oxidation induced time (OIT) value of PE insulator remains approximately constant after irradiation to γ-ray up to a dose of 1000 kGy and fast reactor neutron fluence of 2.9×1010 n.cm². Taking into account Izerrouken et al. results (M. Izerrouken, A. Sari, D. Tahtat, O. Menchi, S. Berkani, R. Zamoun, A. Ameur, IAEA-CN-231-D.16, 2015), it is concluded that PE insulator present a successful thermal stability under neutron and γ-ray irradiations compared to PVC jacket which is very sensitive even at low dose. [ABSTRACT FROM AUTHOR]