The physical and mathematical model of the shock wave formation and evolution in the outflow of a boiling coolant from a vessel filled with the high pressure water after depressurization was investigated. For mathematical description of the pressure waves formation processes the half-empirical relaxation model and the model of maximum superheating was used that is correspond to the description of the boiling processes as vaporization initiated by fluctuation nucleation. The amplitudes of the shock waves and the time dependencies of the pressure acting on the obstacles situated on different distances from the tube rupture were calculated. The influence of the initial coolant pressure and temperature, time of disruption and diameter on the intensity of shock wave were revealed by a series of calculations. It was found that the pressure on obstacle after the normal shock wave falling is dramatically increasing and then decreasing. Relative growth of amplitude of the reflection shock wave is increasing with a growth of initial temperature of the coolant in vessel.

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