Spraying apparatus applied for pressurized water reactor nuclear power plant pressurizer pressure-relief box

The present invention relates to a spraying apparatus applied for a pressurized water reactor nuclear power plant pressurizer pressure-relief box. The spraying apparatus is arranged on the top region in a sealed tank-like pressure-relief box, and comprises a spraying main pipe, two spraying branch pipes and a connection pipe, wherein the spraying main pipe extends into the internal of the pressure-relief box from the top of the pressure-relief box, the two spraying branch pipes are arranged in a parallel manner, the axial direction center positions of the two spraying branch pipes are communicated through the connection pipe, the one spraying main pipe end positioned outside the pressure-relief box is connected with a water source, the one spraying main pipe end positioned inside the pressure-relief box is connected to the axial direction center position of the connection pipe, and the axis line of the spraying main pipe, the axis line of the spraying branch pip and the axis line of the connection pipe are mutually perpendicular to each other. According to the invention, the two spraying branch pipes are arranged in the parallel manner, such that the spraying amount and the spraying range are increased while installation of other connection pipes on the upper portion inside the pressure-relief box cylinder is avoided so as to easily arrange and install; the number of the spraying heads is increased, and the flow rate of the single spraying head is properly reduced, such that the spraying is uniform; and the spraying heads are arranged in an angle forming manner, such that the spraying range is wide.