This study deals with the consequence analysis of an accidental release of chlorine from a storage tank in a chlor-alkali plant. Chlorine is a liquefied gas and is stored in tanks for various uses like the production of textiles, paper products, and so forth. Chlorine is highly toxic and if released accidentally has the potential to kill or injure people in the vicinity of the storage tank. Calculations are used to determine the discharge rate of chlorine in liquid phase, liquid-gas phase, and gas phase. Subsequently, dispersion calculations are used to determine the downwind concentrations in the vicinity of the tank. The probit equation is used to estimate fatalities for the various accident scenarios. These results are used to develop improvement needs and an emergency response plan. (c) 2012 American Institute of Chemical Engineers Process Saf Prog 31: 145-147, 2012