A Nuclear bomb explosion within or immediately nearby a City or town can cause catastrophic damage on the building's, infrastructures, basic amenities, and shutting down of critical life-safety systems. Nuclear explosions produce immediate effects such as Blast, thermal radiation, prompt ionizing radiations and delayed destructive effects such as radioactive fallout and other possible environmental effects, cause damage over an extended period ranging from hours to years. In this present study a Simulated City with all basic amenities with an area of 125 Square Kilometers is developed using Satellite Data of different Cities and GIS. Data for existing City is not used in this study because of security reasons. Any how the City is planned and modeled as per second Master plan of Chennai Metropolitan Area. The Model City is detonated with a yield of 10 Kiloton of Nuclear explosions using openly available source Hotspot 2.07 as the surface blast at various locations. The ill effects are predicted and modeled using Arc GIS.