Computer models are now an important part of the environmental health and safety assessment. The study and improvement of techniques in atmospheric dispersion modeling of radioactive effluent in risk assessment and emergency response date back to half a century ago (Abdul Basit, 2010; Yao, 2011). The International Atomic Energy Agency (IAEA) has outlined its recommendations on modeling for the assessment of environmental impacts due to routine releases from NPP (IAEA, 1982). To achieve some of the regulatory recommendations, it is necessary to use robust environmental modeling techniques. The AERMOD model has been used for accurate dispersion calculation of radioactive fallouts from the incineration of urban solid wastes (Ronchin et al., 2011), and has also been considered a candidate for offsite doses calculations (Aliyu et al., 2013).