Nuclear power plants are considered as a vital structure in these days. Heavy weight concrete is used in radiation shielding for nuclear power plants which is characterized by high density of aggregate. Moreover, type of aggregate used in the concrete mix play an important role in obtaining heavy weight concrete. The coarse aggregate which is used in this research is hematite coarse aggregate. Small prisms were manufactured in the laboratory in order to measure the variation in electrical resistivity for heavy weight concrete prisms, one prism is uncracked and the other prism is manufactured with a vertical crack. The objective for this research paper is to detect the cracks using inner electrical resistivity for heavy weight concrete which contains hematite coarse aggregate. The two parameters which are used in detecting cracks are the percentage change in electrical resistivity and the second parameter is Decimal Logarithm Resistivity Anisotropy (DLRA). The inner electrical resistivity measurements were measured two concrete prisms by two methods, the first is linear inner electrical resistivity measurement (LIERM) and the other accurate one is the square inner electrical resistivity measurement (LIERM). This paper is concerned in detecting cracks especially the inner cracks which can’t be observed by naked eyes using non-destructive testing method such as inner electrical resistivity method. It was concluded that the inner electrical resistivity can be used efficiently for detecting inner cracks using the percentage change in electrical resistivity and DLRA which detect the presence of crack inside the small laboratory prisms efficiently.