Quick cooling method for nuclear power unit pressure stabilizer

The invention belongs to the technical field of nuclear power plants, and particularly relates to a quick cooling method for a nuclear power unit pressure stabilizer. Spraying cooling can be conductedonly when the wall temperature is required to be less than 168 DEG C according to a design manual during pressure stabilizer maintenance, the temperature can be achieved only after at least four daysthrough a natural cooling method, and the maintenance waiting period is greatly prolonged. The method comprises the following steps: step 1, selecting a pressure set value; step 2, selecting a true pressure value; step 3, calculating the opening degree of a steam release valve PCV5 and the opening degree of a steam release valve PCV6; step 4, preventing the metal of the pressure stabilizer from being cooled by stabilizing the steam flow; step 5, calculating the temperature of the pressure stabilizer; step 6, cooling the metal wall face of the pressure stabilizer through the stable steam flow;and step 7, spraying and c