Sprays play an important role in cooling and decreasing pressure inside containment of nuclear reactor in emergency situations and excessive pressure of containment. When temperature and pressure exceed 120°C and 2 bars respectively, the sprays cool the inside of PWR containment. Containment spray system is designed to condense the steam to prevent the occurence of high pressure and temperature, which could lead to disintegrtion of containment and as result leakage of radioactive material to the environment. In this study a simulation of a concrete tank of reactor (containment) with 250 sprays is accomplished using Ansys Fluent software (18.2). Multiphase mixture model and k-ԑ realizable turbulence model is used to model the reactor. Associated equations are solved using finite volume method (SIMPLE algorithm with pressure and velocity coupling) in Ansys Fluent software. It is assumed that the flow regime is transient. Results of thermal-hydraulic function of spraying, which has decreased pressure and temperature, is presented.