This presentation is dedicated to the development of simple models to investigate the effects of water spray system on the premixed hydrogen-air combustion in large-scale industrial applications, such as accidental explosions in the nuclear power plants or offshore platforms. The interactions between the water spray, hydrogen-air flame and explosion-induced shock waves are investigated separately. Specific simple models are developed to describe the water droplet evaporation in the flame, particle cloud dispersion after the shock wave passage, and turbulence length scale evolution with the presence of a water spray. These developed numerical models can be implemented in the large-scale numerical simulations to evaluate the spray effects on the accidental hydrogen explosions.