Selama terjadi LOCA, proses oksidasi zircaloy sebagai kelongsong bahan bakar nuklir oleh uap akan membentuk lapisan oksida pada permukaan kelongsong dan menghasilkan hidrogen. Sebagian hidrogen yang terbentuk akan memiliki potensi untuk During a LOCA accident at high temperature the oxidation process of zirconium alloycladdings in steam creates an external oxide layer on the tube surface and produces hydrogen.A part of the hydrogen can be absorbed by the metal [1]. The oxide layer, the oxygen andhydrogen content degrades the mechanical properties of the cladding it mostly results in theembrittlement of the alloys. The embrittlement can lead to the failure of the fuel rods underaccidental conditions, especially during the reflooding of the hot nuclear core.